JP6437244B2 - Constraint-specific deformation data calculation system and calculation program, welding deformation prediction system and welding deformation prediction program - Google Patents

Description

  The present invention relates to inherent deformation data used when predicting welding deformation of a structure formed by welding a plurality of members by analysis using a finite element method (hereinafter referred to as “FEM analysis”), particularly constraint conditions during welding. A calculation system and calculation program for constraint inherent deformation data in consideration of the above, and a welding deformation prediction system and weld deformation prediction program for predicting weld deformation of a structure by FEM analysis using the constraint inherent deformation data. It belongs to the field of prediction technology.

  When manufacturing a structure by welding a plurality of members, it is important to predict in advance how the structure will deform as a whole due to heat during welding. Attempts have been made. As a method for predicting welding deformation of a structure using a computer, there is known a method for predicting welding deformation of an entire structure by elastic FEM analysis using inherent deformation data for each weld line of the structure.

  For the inherent deformation data used when predicting the weld deformation of the structure by elastic FEM analysis, for example, the inherent deformation data recorded from the Japan Welding Association according to the welding type of the welded joint, the material physical properties of the welded member, etc. The database is public.

Here, the inherent deformation will be described by taking as an example a case where the weld type of the welded joint is butt welding.
When welding multiple members, inherent strain will occur in a predetermined region near the weld line due to the heat during welding, but inherent deformation is the integration of this inherent strain in the region of occurrence, It can be defined by four basic deformations: longitudinal shrinkage, transverse shrinkage, longitudinal bending, and transverse bending.

  FIG. 1 is an explanatory diagram for explaining inherent deformation at the time of butt welding. In FIG. 1, a state in which a first member M11 having a thickness t11 and a second member M12 having a thickness t12 are joined by butt welding. Show. In FIG. 1, the weld line direction is the X direction, the width direction orthogonal to the weld line direction is the Y direction, and the plate thickness direction is the Z direction.

  As shown in FIG. 1, in the butt welding in which the end faces of the first member M11 and the second member M12 are butted together, a weld line L11 is formed between the first member M11 and the second member M12, and the weld line. Intrinsic strain occurs in L11 and a predetermined region in the vicinity thereof, and this inherent strain is dominated by the inherent strain component εx in the weld line direction and the inherent strain component εy in the width direction orthogonal to the weld line direction.

  The distribution of the inherent strain component εx in the cross section (yz cross section) orthogonal to the weld line direction is represented as εx (y, z), and the distribution of the natural strain component εy in the cross section (yz cross section) orthogonal to the weld line direction is represented as εy (y , Z), in the intrinsic strain region, εx (y, z) and εy (y, z) have strain distributions in the width direction and the plate thickness direction as shown in FIG.

  In general, the distributions εx (y, z) and εy (y, z) of the inherent strain components are large at the welding line L11 of the first member M11 and the second member M12 in the width direction, and become smaller as the distance from the welding line L11 increases. In addition to a large distribution, the distribution is such that, in the thickness direction, the welding heat input side (upper side in FIG. 1) greatly decreases toward the opposite side (lower side in FIG. 1).

The inherent deformation obtained by integrating the inherent strain in the generation region (the inherent strain region) can be defined by four basic deformations of longitudinal contraction, lateral contraction, longitudinal bending, and lateral bending, and the inherent longitudinal contraction of the first member M11. The amount Dx ₁₁ , the intrinsic transverse contraction amount Dy ₁₁ , the intrinsic longitudinal bending amount Rx ₁₁ , and the intrinsic transverse bending amount Ry ₁₁ are defined by the following equations 1 to 4, respectively, and the intrinsic longitudinal shrinkage amount Dx of the second member M12 ₁₂ , the intrinsic transverse contraction amount Dy ₁₂ , the intrinsic longitudinal bending amount Rx ₁₂ , and the intrinsic transverse bending amount Ry ₁₂ are defined by the following equations 5 to 8, respectively.

The intrinsic strain region has the center of the weld line L11 as zero and has the size of b11 on the first member M11 side and the size of b12 on the second member M12 side, and the intrinsic strain of the first member M11. The distribution of components is expressed as εx ₁₁ (y, z) and εy ₁₁ (y, z), and the distribution of the inherent strain component of the second member M12 is expressed as εx ₁₂ (y, z) and εy ₁₂ (y, z). Yes.

FIG. 2 is a diagram schematically showing the inherent deformation at the time of butt welding. In FIG. 2, a portion having a unit length in the weld line direction of the inherent strain region is partially extracted and shown. When the first member M11 and the second member M12 are joined by butt welding at the weld line L11, as qualitatively shown in FIG. 2 (a), the natural strain region is contracted in the weld line direction. the longitudinal shrinkage, which represents the contraction of the weld line direction, unique longitudinal shrinkage amount Dx ₁₁ of the first member M11 is defined by the equation shown by the equations 1, unique longitudinal shrinkage amount Dx ₁₂ of the second member M12 Is defined by the equation shown in Equation 5 above.

Further, at the time of butt welding of the first member M11 and the second member M12, as shown in FIG. 2 (b), in the inherent strain region, it is contracted in the width direction orthogonal to the weld line direction. is intended to refer to shrinkage in the width direction perpendicular to the weld line direction, inherent transverse shrinkage amount Dy ₁₁ of the first member M11 is defined by the equation shown by the equation 2, intrinsic transverse shrinkage of the second member M12 Dy ₁₂ is defined by the equation shown in Equation 6 above.

Further, during butt welding of the first member M11 and the second member M12, as shown qualitatively in FIG. 2C, the first member M11 and the second member M12 are curved and deformed in the direction of the weld line in the inherent strain region. and is representative of the bending of the weld line direction, inherent vertical bending amount Rx ₁₁ of the first member M11 is defined by the equation shown by the equations 3, unique vertical bending amount Rx ₁₂ of the second member M12 is the It is defined by the equation shown in Equation 7.

Further, at the time of butt welding of the first member M11 and the second member M12, as shown in FIG. 2 (d), in the inherent strain region, the first member M11 and the second member M12 are curved and deformed in a direction perpendicular to the weld line direction. bending is intended to refer to the bending direction perpendicular to the weld line direction, inherent lateral bending amount Ry ₁₁ of the first member M11 is defined by the equation shown by the equations 4, bending natural next second member M12 The quantity Ry ₁₂ is defined by the equation shown in Equation 8 above.

  In addition, as for natural deformation in other welding types such as single side fillet welding, double side fillet welding and lap fillet welding, the four basic deformations of longitudinal shrinkage, transverse shrinkage, longitudinal bending and transverse bending are the same as butt welding. Can be defined by

  In addition, since the existing inherent deformation data recorded in the inherent deformation database is for a specific condition, for example, Patent Document 1 discloses that existing inherent deformation data is converted into existing inherent deformation data using the existing inherent deformation database. There is disclosed a technique in which inherent deformation data of a weld line made of a material different from the recorded weld line is calculated. Further, for example, Patent Document 2 discloses that the intrinsic deformation of welded members to be welded to each other is calculated based on the shapes before and after the welding deformation in which the welded members are actually welded.

JP 2012-117927 A JP 2013-182447 A

  By the way, when a structure is manufactured by actually welding a plurality of members, it is generally performed to perform welding in a state of being restrained by a restraining jig. When the constraint conditions at the time of welding are not taken into consideration for the inherent deformation data, an error between the weld deformation actually welded in a state constrained by the restraining jig and the weld deformation predicted using the inherent deformation data becomes large.

  On the other hand, the welding deformation is calculated by thermoelastic-plastic FEM analysis for each constraint condition in consideration of the constraint condition at the time of welding. Although it is possible to predict with high accuracy, calculating the welding deformation by the thermoelastic-plastic FEM analysis for each constraint condition at the time of welding has a problem that the calculation amount is very large and the calculation time becomes long. Further, since the restraint position is a design variable, it is not realistic to calculate a large number of restraint inherent deformations by thermoelastic-plastic FEM analysis when the restraint position changes.

  If it is possible to calculate constraint inherent deformation data considering the constraint conditions during welding from the inherent deformation data corresponding to the weld line when there is no constraint, the welding deformation can be predicted by elastic FEM analysis using the constraint inherent deformation data. By doing so, it is considered that the welding deformation can be accurately predicted by a relatively simple calculation.

  Therefore, the present invention predicts welding deformation of a structure by FEM analysis using a constraint inherent deformation data calculation system and calculation program for calculating constraint inherent deformation data according to the constraint conditions during welding, and the constraint inherent deformation data. It is an object to provide a welding deformation prediction system and a welding deformation prediction program.

  In order to solve the above problems, the present invention is configured as follows.

First, the invention according to claim 1 of the present application is a calculation system for constraint inherent deformation data in consideration of constraint conditions used when predicting welding deformation of a structure formed by welding a plurality of members by FEM analysis, Intrinsic deformation data acquisition means for acquiring inherent deformation data corresponding to the weld line of the structure, restriction position acquisition means for acquiring a restriction position for restraining the member during welding, and restriction position obtained by the restriction position acquisition means Based on the above, in accordance with a predetermined conversion formula, the inherent deformation data obtained by the inherent deformation data obtaining means is converted to calculate the restricted inherent deformation data and the weld width of the weld line is obtained. and a weld width acquisition unit that, the constraint inherent variation data calculating means in accordance with the predetermined conversion formula, when calculating the restraint inherent deformation data, before And calculating a constraint inherent deformation data with the been restraining position acquired by the restraining position obtaining unit dimensionless with the obtained weld width by the weld width acquisition unit value as a parameter.
Here, intrinsic deformation data refers to data of intrinsic deformation in a state where there is no constraint, and constrained inherent deformation data refers to data of intrinsic deformation in a state where there is constraint.

The invention according to claim 2 has conversion formula calculation means for calculating the conversion formula in the invention according to claim 1 , wherein the conversion formula calculation means is predetermined without constraining the member during welding. Specific deformation data based on the shape before and after welding deformation to be welded with a welding width of and the constraint specific deformation data based on the shape before and after welding deformation to be welded by restraining the member at a predetermined restraining position, and the acquired The ratio of the constraint inherent deformation data to the inherent deformation data is calculated for a plurality of constraint positions, and the constraint position is determined by the weld width from the ratio of the constraint inherent deformation data to the inherent deformation data for the calculated plurality of constraint positions. A constant of an approximate expression representing the relationship between the dimensionless parameter and the ratio of the constraint inherent deformation data to the inherent deformation data in the parameter is calculated, Equation, and calculates, as the conversion formula.

The invention according to claim 3 is the invention according to claim 2 , wherein the conversion formula calculating means sets the conversion formula as a parameter b ′ obtained by making the constraint position dimensionless by the welding width, the corresponding unique deformation data and a _0, a constrained-specific modification data corresponding to the weld line in the parameter b'and a (b'), based on a ratio of the constraining specific modification data for the specific modification data for a plurality of restraining position The determined constants are calculated as an exponential function according to the following relational expression, where α and β are the constants.
A (b ′) / A ₀ = 1 + α × exp (−β × b ′)

Furthermore, the invention according to claim 4 is a welding deformation prediction system that predicts welding deformation of a structure formed by welding a plurality of members by FEM analysis, and considers constraint conditions for each weld line of the structure. As means for acquiring the constraint inherent deformation data, the inherent deformation data acquisition means for acquiring the inherent deformation data corresponding to the weld line of the structure, the constraint position acquisition means for acquiring the constraint position for restraining the member during welding, Based on the constraint position acquired by the constraint position acquisition unit, the constraint inherent deformation data calculation unit calculates the constraint inherent deformation data by converting the inherent deformation data acquired by the inherent deformation data acquisition unit according to a predetermined conversion formula. And an analysis model created by dividing the structure into finite elements is calculated by the constraint inherent deformation data calculation means. Apply the constraint inherent deformation data for each weld line was, elastic by FEM analysis possess a welding deformation calculating means for calculating a welding deformation of the structure, constraints inherent in consideration of constraints for each weld line of said structure As means for acquiring deformation data, the apparatus further comprises welding width acquisition means for acquiring the welding width of the weld line, and the constraint inherent deformation data calculation means calculates the constraint inherent deformation data according to the predetermined conversion formula. In addition, the constraint inherent deformation data is calculated using as a parameter a value obtained by making the constraint position acquired by the constraint position acquisition unit dimensionless with the welding width acquired by the welding width acquisition unit .

The invention according to claim 5 is a calculation program for constraint inherent deformation data in consideration of constraint conditions used when FEM analysis predicts welding deformation of a structure formed by welding a plurality of members, and includes a computer. , Inherent deformation data acquisition means for acquiring inherent deformation data corresponding to the weld line of the structure, restraint position acquisition means for acquiring a restraint position for restraining the member at the time of welding, and constraint acquired by the restraint position acquisition means Based on the position, according to a predetermined conversion formula, the inherent deformation data acquired by the inherent deformation data acquisition unit is converted to calculate the constraint inherent deformation data to calculate the constraint inherent deformation data . The computer functions as a welding width acquisition means for acquiring a welding width of the weld line, and the computer calculates the constraint inherent deformation data. When functioning as a means, the constraint position acquired by the constraint position acquisition means is dimensionless with the weld width acquired by the weld width acquisition means when calculating the constraint inherent deformation data according to the predetermined conversion formula. It is made to function so that constraint specific deformation data may be calculated using the converted value as a parameter.

Further, in the invention according to claim 6 , in the invention according to claim 5 , the computer is further caused to function as conversion formula calculation means for calculating the conversion formula, and the computer is caused to function as the conversion formula calculation means. When, based on the specific deformation data based on the shape before and after welding deformation that welds with a predetermined welding width without constraining the member during welding and the shape before and after welding deformation that constrains the member at a predetermined restraining position and welds The constraint inherent deformation data is acquired, the ratio of the constraint inherent deformation data to the acquired inherent deformation data is calculated for a plurality of constraint positions, and the constraint for the inherent deformation data for the calculated plurality of constraint positions is calculated. From the ratio of the inherent deformation data, the parameter that made the constraint position dimensionless with the welding width and the inherent deformation data in the parameter Against calculating the approximate expression of the constant representing the relationship between the ratio of bound specific deformation data, the approximate expression, is characterized in that is operable to calculate, as the conversion formula.

Further, in the invention according to claim 7 , in the invention according to claim 6 , when the computer functions as the conversion formula calculation unit, the conversion formula is set to a parameter obtained by making the constraint position dimensionless by the welding width. b ′, the inherent deformation data corresponding to the weld line is A ₀ , the constraint inherent deformation data corresponding to the weld line in the parameter b ′ is A (b ′), and the constraint inherent to the inherent deformation data for a plurality of constraint positions The constants determined based on the ratio of the deformation data are set as α and β, and function as an exponential function according to the following relational expression.
A (b ′) / A ₀ = 1 + α × exp (−β × b ′)

Furthermore, the invention according to claim 8 is a welding deformation prediction program for predicting welding deformation of a structure formed by welding a plurality of members by FEM analysis, wherein the computer is configured to perform a constraint condition for each weld line of the structure. As a means for acquiring constraint inherent deformation data taking into account, inherent deformation data acquisition means for acquiring inherent deformation data corresponding to the weld line of the structure, constraint position acquisition means for acquiring a constraint position for restraining the member during welding, And based on the constraint position acquired by the constraint position acquisition means, the constraint inherent deformation for calculating the constraint inherent deformation data by converting the inherent deformation data acquired by the inherent deformation data acquisition means according to a predetermined conversion formula In addition to functioning as data calculation means, the computer further analyzes the structure created by dividing the structure into finite elements. Le, apply the constraint inherent deformation data for each weld line calculated by the constraint inherent variation data calculating means to function as a welding deformation calculating means for calculating a welding deformation of the structure by a resilient FEM analysis, the computer Further, as means for acquiring the constraint inherent deformation data in consideration of the constraint condition for each weld line of the structure, the computer further causes the computer to function as the weld width acquisition means for acquiring the weld width of the weld line. When functioning as data calculation means, the constraint position acquired by the constraint position acquisition means when the constraint inherent deformation data is calculated according to the predetermined conversion formula is the welding width acquired by the welding width acquisition means. and characterized in that to function to calculate the constraint inherent deformation data using the non-dimensional values as parameters That.

  With the above configuration, according to the invention of each claim of the present application, the following effects can be obtained.

  First, according to the invention according to claim 1 of the present application, the inherent deformation data corresponding to the weld line of the structure is converted according to a predetermined conversion formula based on the restraint position that restrains the member during welding, and the restraint inherent deformation is performed. Data will be calculated. As a result, it is possible to calculate the constraint inherent deformation data in consideration of the constraint condition from the inherent deformation data corresponding to the weld line. Therefore, when the welding deformation of the structure is predicted by FEM analysis, the welding deformation can be accurately predicted by relatively simple calculation by using the constraint inherent deformation data considering the constraint conditions.

Further, according to Jo Tokoro conversion formula, when the restraint-specific modification data is calculated, it constrained inherent deformation data is calculated using a value obtained by dimensionless welding width of the weld line arresting position as a parameter. Thereby, compared with the case where the welding width of a weld line is not considered, when welding deformation deformation of a structure is predicted by FEM analysis using constraint inherent deformation data, welding deformation can be predicted with high accuracy.

Further, according to the invention according to claim 2 , the inherent deformation data based on the shape before and after welding deformation that is welded with a predetermined welding width without being constrained and the shape before and after welding deformation that is constrained and welded at a predetermined restraining position. Based on the constraint inherent deformation data, the ratio of the constraint inherent deformation data to the inherent deformation data is calculated for a plurality of constraint positions. Then, from the ratio of the constraint inherent deformation data to the inherent deformation data for a plurality of constraint positions, an approximation representing the relationship between the constraint position non-dimensional parameter with the welding width and the constraint inherent deformation data for the inherent deformation data in the parameter A constant of the formula is calculated, and the approximate formula is calculated as the conversion formula. As a result, the constraint inherent deformation data can be calculated by a relatively simple calculation for a constraint position different from the constraint position used to calculate the conversion formula, and the above-described effect can be effectively achieved.

According to the invention of claim 3 , the conversion formula is such that the parameter obtained by making the constraint position dimensionless by the welding width is b ′, the inherent deformation data corresponding to the weld line is A ₀ , and the parameter b ′ As an exponential function according to the relational expression of A (b ′) / A ₀ = 1 + α × exp (−β × b ′), where A (b ′) is the constraint inherent deformation data corresponding to the weld line, and α and β are constants. By being calculated, it can be applied to any restraint position, and the above-described effect can be effectively achieved.

According to the invention of claim 4 , the structure calculated by the same means as the inherent deformation data acquisition means, restraint position acquisition means, restraint inherent deformation data calculation means , and welding width acquisition means of claim 1. The weld deformation of the entire structure is calculated by elastic FEM analysis using the constraint inherent deformation data for each weld line of the body, and the weld deformation of the structure is compared in consideration of the restraint conditions during welding. Can be predicted accurately with simple calculations.

According to the invention related to the program described in claims 5 to 8 , the same effect as that of the invention described in claims 1 to 4 relating to the system can be obtained by executing the program on a computer.

It is explanatory drawing for demonstrating the natural deformation | transformation at the time of butt welding. It is the figure which showed typically the natural deformation | transformation at the time of butt welding which cut out only the intrinsic strain area | region. It is a figure which shows the structural body model formed by welding a some plate-shaped member. It is explanatory drawing for demonstrating the deformation | transformation at the time of welding in a non-restraining state and a restraint state. 1 is a diagram illustrating an overall configuration of a system according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a configuration of a storage device illustrated in FIG. 5. It is a figure which shows the graphic data of a welded joint. It is a figure which shows the data recorded on the intrinsic deformation database. It is a figure which shows the data recorded on the welding line condition data table. It is a figure which shows the data recorded on the data table for conversion formula calculation. It is a figure which shows another data recorded on the data table for conversion formula calculation. It is a figure which shows the data recorded on the conversion type | formula data file. It is a figure which shows the data recorded on the restraint intrinsic deformation result data file. It is a flowchart which shows the operation | movement which estimates the welding deformation of a structure. It is a flowchart which shows the operation | movement which calculates a constraint natural deformation | transformation. It is a flowchart which shows the operation | movement which calculates an intrinsic deformation conversion type | formula. It is a graph which shows the relationship between a constraint parameter and normalized vertical contraction, and an intrinsic deformation conversion formula. It is a graph which shows the relationship between a constraint parameter and normalized lateral contraction, and an intrinsic deformation conversion formula. It is a graph which shows the relationship between a constraint parameter and normalized lateral bending, and an intrinsic deformation conversion formula. It is a graph which shows the relationship between a constraint parameter and normalized vertical contraction, and another intrinsic deformation conversion formula. It is a graph which shows the relationship between a constraint parameter and normalization lateral contraction, and another intrinsic deformation conversion formula. It is a graph which shows the relationship between a constraint parameter and normalized transverse bending, and another intrinsic deformation conversion formula. It is a graph which shows the relationship between a constraint parameter and normalized vertical contraction, and another intrinsic deformation conversion formula. It is a graph which shows the relationship between a constraint parameter and normalization lateral contraction, and another intrinsic deformation conversion formula. It is a graph which shows the relationship between a constraint parameter and normalized transverse bending, and another natural deformation transformation formula. It is a figure which shows the graphic data of another welded joint. It is a figure which shows the data recorded on the weld line condition data table about another welded joint. It is a figure which shows the data recorded on the data table for conversion type calculation about another welded joint. It is a figure which shows the other data recorded on the data table for conversion formula calculation about another welded joint. It is a graph which shows the relationship between the restraint parameter of a 1st member, normalized vertical contraction, and an intrinsic deformation conversion formula about another welded joint. It is a graph which shows the relationship between the constraint parameter of a 1st member, normalized transverse contraction, and an intrinsic deformation conversion formula about another welded joint. It is a graph which shows the relationship between the constraint parameter of a 1st member, normalized transverse bending, and an intrinsic deformation conversion formula about another welded joint.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 3 is a diagram showing a structure model formed by welding a plurality of plate-like members. In the structure model 1 shown in FIG. 3, the first member M1 and the second member M2 are welded with a weld line L1, the first member M1 and the third member M3 are welded with a weld line L2, and the first member M1 and the first member M1 It is designed to weld and manufacture a plurality of plate-like members, such as welding the four members M4 with a welding line L3.

  In this embodiment, the constraint inherent deformation in consideration of the constraint condition from the inherent deformation data for each weld line used when predicting the weld deformation of the structure formed by welding a plurality of plate-like members as shown in FIG. Data is calculated, and weld deformation of the structure is predicted by FEM analysis using the constraint inherent deformation data. The plate-like member includes not only a flat member but also a curved member, a spherical member, and the like.

  Here, intrinsic deformation data refers to data of intrinsic deformation in a state where there is no constraint, and constrained inherent deformation data refers to data of intrinsic deformation in a state where there is constraint.

  FIG. 4 is an explanatory diagram for explaining deformation during welding in the unconstrained state and the constrained state. When the first member M1 and the second member M2 are joined by butt welding at the welding line L1, as shown in FIG. 4A, welding is performed when welding is performed in an unconstrained state not restrained by a restraining jig. Later, the welding deformation is large, but as shown in FIG. 4 (b), when welding in a state of being restrained by the restraining jig 2, the welding deformation is smaller than when welding in an unconstrained state. It becomes.

  Since the welding deformation varies depending on the constraint conditions as described above, in this embodiment, in order to accurately predict the welding deformation, in the present embodiment, the constraint considering the constraint conditions from the inherent deformation data corresponding to the weld line for the member to be welded. The inherent deformation data is calculated, and the constraint inherent deformation data is used for prediction of welding deformation.

  Hereinafter, a constraint inherent deformation data calculation system and a welding deformation prediction system according to an embodiment of the present invention will be described.

  FIG. 5 is a diagram showing an overall configuration of a system according to the embodiment of the present invention. As shown in FIG. 5, the system according to the embodiment of the present invention is configured with a computer 10 as the center. The computer 10 and the central processing unit 11 and data necessary for calculation of constraint inherent deformation data and calculation of welding deformation. An input device 12 such as a keyboard for inputting the data, a display device 13 such as a display for displaying the calculation result of the constraint specific deformation data, the calculation result of the welding deformation, and the like, and the constraint specific deformation data for calculating A storage device 14 such as a memory for storing a program, a program for calculating welding deformation, and the like, and an output device 15 such as a printer for outputting a calculation result of welding deformation, etc. It is connected to the stored unique deformation database 20.

  The central processing unit 11 is configured to control the input device 12, the display device 13, and the output device 15, and to be able to access the storage device 14 and the inherent deformation database 20. The central processing unit 11 uses the information input via the input device 12, the program and data recorded in the storage device 14, and the inherent deformation data stored in the inherent deformation database 20, and uses the constraint uniqueness. The deformation data is calculated and the welding deformation is calculated, and the calculation result of the welding deformation is stored in the storage device 14.

  FIG. 6 is a diagram showing the configuration of the storage device shown in FIG. As shown in FIG. 6, the storage device 14 includes a program storage unit and a data storage unit. The program storage unit divides the figure data of the structure into finite elements and creates an analysis model. An analysis model creation program, a conversion formula calculation program for calculating a conversion formula for converting the inherent deformation data into the constraint inherent deformation data, a constraint inherent deformation calculation program for calculating the constraint inherent deformation data from the inherent deformation data, A welding deformation calculation program for calculating the welding deformation of the structure by elastic FEM analysis, a display program for displaying an input screen, an analysis result, and the like are stored.

  The conversion calculation program converts the inherent deformation data based on the shape before and after welding deformation to be welded with a predetermined welding width without constraining the member at the time of welding, and the shape before and after welding deformation to restrain the member at a predetermined restraining position and weld it. And the ratio of the constraint inherent deformation data to the acquired inherent deformation data is calculated for a plurality of constraint positions, and the ratio of the constraint inherent deformation data to the inherent deformation data for the calculated plurality of constraint positions is obtained. , Calculating a constant of an approximate expression that represents the relationship between the parameter in which the constraint position is made dimensionless by the welding width and the ratio of the constraint inherent deformation data to the inherent deformation data in the parameter, and the approximate expression is constrained to the inherent deformation data. It is calculated as a conversion formula for converting into inherent deformation data.

  The constraint inherent deformation calculation program calculates the constraint inherent deformation data by converting the inherent deformation data corresponding to the weld line in accordance with a predetermined conversion formula based on the constraint position where the member is restrained during welding. Specifically, when calculating the constraint specific deformation data in accordance with a predetermined conversion formula, the constraint specific deformation data is obtained using as a parameter a value obtained by making the constraint position for binding the member during welding non-dimensional with the weld width of the weld line. Is supposed to calculate.

  The welding deformation calculation program applies the constraint inherent deformation data of each weld line to an analysis model created by dividing a structure into finite elements, and calculates the weld deformation of the structure by a known elastic FEM analysis. Yes.

  On the other hand, in the data storage unit, a structure shape data file in which graphic data of a structure formed by welding a plurality of members is recorded, and a welding method, a welding type, a welding condition, and a welding target for each weld line of the structure Without calculating the welding line condition data table in which the members are recorded and the conversion formula for converting the specific deformation data into the constrained natural deformation data considering the constraint conditions There is provided a conversion calculation calculation data table in which inherent deformation data based on the shape before and after welding deformation to be welded and constrained inherent deformation data based on the shape before and after welding deformation in which a member is restrained at a predetermined restraining position and welded are provided It has been.

  The data storage unit also calculates the conversion formula data file that records the calculation result of the conversion formula for converting the specific deformation data into the constraint specific deformation data for each weld line, and the specific deformation data corresponding to each weld line. A constraint inherent deformation result data file in which the calculation result of the constraint inherent deformation data is recorded, and a welding deformation result data file in which the calculation result of the weld deformation of the structure is recorded are provided.

  FIG. 7 is a diagram showing graphic data of a welded joint, FIG. 7A is a perspective view of the welded joint, and FIG. 7B is a front view of the welded joint. In the present embodiment, a description will be given of a case where the constraint inherent deformation data considering the constraint condition is calculated from the inherent deformation data corresponding to the weld line for the weld line L1 of the structure model 1.

The graphic data of the structure is input via the input device 12 and recorded in the structure shape data file, and the graphic data of the weld joint corresponding to the weld line is recorded. Regarding the weld line L1 of the butt joint in which the plate-like first member M1 and second member M2 having the same shape and the same physical properties are butt-welded, the first member M1 and the second member M2 are respectively weld lines L1. Welding is performed in a state of being restrained by a restraining jig arranged so as to be a distance b ₁ from the center (see FIG. 4B).

In the present embodiment, as a constraint condition, and simulated to be bound by the restraining jig main the distance b ₁ from the position of the weld line L1, as shown in FIG. 7, the distance from the center of the weld line L1 by fixing the upper and lower nodes of the restrained position b ₁ of the b ₁ calculates the welding deformation. Specific to each node of the arresting position b ₁ is X, Y, and fixed by constraining the Z-direction, to calculate the welding distortion in the case releasing the restraint after welding. For the weld line L1, the welding width is 2bw _1, and the length, width, and plate thickness of the first and second members M1, M2 are shown as l ₁ , w _1, and t ₁ , respectively. In this embodiment, l ₁ , w ₁ and t ₁ are set to 400 mm, 200 mm and 10 mm, respectively, and bw ₁ is set to 10 mm.

  FIG. 8 is a diagram showing data recorded in the inherent deformation database. As shown in FIG. 8, in the inherent deformation database, inherent deformation data corresponding to the weld line is registered in advance together with condition information such as a welding method, a welding type, a member to be welded, and welding conditions. Specifically, welding methods such as arc or laser, butt welding, one-side fillet welding, double-side fillet welding or lap fillet welding, etc., materials such as steel plate or aluminum plate as a member to be welded, plate thickness, The density, specific heat and thermal expansion coefficient, current, voltage, speed and thermal efficiency as welding conditions, and longitudinal shrinkage, lateral shrinkage, longitudinal bending and lateral bending as intrinsic deformation data are recorded.

  In the data where the welding type registered in No. 1 is butt welding, the first member and the second member welded to each other have the same plate thickness and the same inherent deformation data, so that the plate thickness and the specific Although the column of deformation data is recorded without being divided into two stages, in the data in which the welding type registered in the number 4 is double-sided fillet welding, the first member and the second member welded to each other are different. Since it has plate thickness and intrinsic deformation data, the column of thickness and intrinsic deformation data, that is, the vertical shrinkage amount, lateral shrinkage amount, vertical bending amount, and horizontal bending amount are divided into two upper and lower stages, and the upper part of the first member Data is recorded, and data of the second member is recorded in the lower part.

  In this way, in the inherent deformation database, when the inherent deformation data of the first member and the second member are different, the data of the first member is recorded in the upper stage, and the data of the second member is recorded in the lower stage. In the case where the inherent deformation database does not include the same welding method, welding type, welded member, and welding condition specific deformation data as the weld line of the structure, for example, the methods described in Patent Document 1 and Patent Document 2 are used. The inherent deformation data corresponding to the weld line of the structure is registered in advance. As the inherent deformation data, it is possible to use inherent deformation data based on welding deformation based on an experiment without constraint, inherent deformation data based on welding deformation based on thermoelastic-plastic FEM analysis, or the like.

In the data registered in number 1 in FIG. 8, t ₁ , ρ ₁ , c ₁ , and α ₁ indicate the plate thickness, density, specific heat, and thermal expansion coefficient of the first and second members, respectively, and I ₁ , V ₁ , V ₁ , and η ₁ represent current, voltage, speed, and thermal efficiency of the welding conditions, respectively, and Dx ₁ , Dy ₁ , Rx ₁ , and Ry ₁ represent the longitudinal shrinkage and lateral shrinkage of the inherent deformation of the first and second members, respectively. In the data registered in the number 4 in FIG. 8, t _4a and t _4b indicate the thicknesses of the first and second members, respectively, and ρ ₄ , c ₄ , α ₄ indicates the density, specific heat, and thermal expansion coefficient of the first and second members, respectively. I ₄ , V ₄ , v ₄ , and η ₄ indicate the current, voltage, speed, and thermal efficiency of the welding conditions, respectively. Dx _4a , Dy _4a , Rx _4a , and Ry _4a are the longitudinal deformation amount and lateral contraction of the inherent deformation of the first member, respectively. Dx _4b , Dy _4b , Rx _4b , and Ry _4b respectively indicate the longitudinal deformation amount, lateral shrinkage amount, longitudinal bending amount, and lateral bending amount of the inherent deformation of the second member. Yes.

FIG. 9 is a diagram showing data recorded in the welding line condition data table. For the weld line, the weld line number, welding method, welding type, welding condition, and member to be welded are input via the input device 12, and as shown in FIG. , Welding type, welding width as welding conditions, restraint position during welding, current, voltage, speed and thermal efficiency, and materials of first and second members to be welded, length, width, plate thickness, Young's modulus and The Poisson's ratio is recorded. Incidentally, the welding width, the welding width bw ₁ per weld members is recorded.

In the data recorded on the weld line L1 in FIG. 9, bw ₁ , b ₁ , I ₁ , V ₁ , v ₁ , and η ₁ are the welding width, the restrained position at the time of welding, current, voltage, and speed, respectively. , ₁ , W ₁ , t ₁ , E ₁ , and ν ₁ represent the length, width, plate thickness, Young's modulus, and Poisson's ratio of the first and second members, respectively. In FIG. 9, since the first and second members have the same shape and the same physical properties, one member to be welded is recorded. However, when the shapes and physical properties of the first and second members are different, the respective welded members are recorded. Recorded for member.

  FIG. 10 is a diagram showing data recorded in the conversion formula calculation data table. In this embodiment, in order to calculate a conversion formula for converting from inherent deformation data to constrained inherent deformation data, inherent deformation data calculated based on the shape before and after welding deformation is input without constraining the member during welding. As shown in FIG. 10, the conversion formula calculation data 1 includes a welding line number, a welding width, and a longitudinal shrinkage amount of inherent deformation data for the first and second members to be welded, as shown in FIG. The amount of horizontal shrinkage, the amount of vertical bending, and the amount of horizontal bending are recorded.

  Inherent deformation data calculated based on the shape before and after welding deformation that welds without constraining the member at the time of welding is obtained by performing thermoelastic-plastic FEM analysis on the welding deformation when welding without restraining the first and second members. Calculated from the data obtained by thermo-elasto-plastic FEM analysis, specifically, the inherent strain is integrated from the inherent strain distribution data in the generation region, and is calculated using the equations shown in the above formulas 1-8. The

  FIG. 11 is a diagram showing another data recorded in the conversion formula calculation data table. Further, in this embodiment, in order to calculate a conversion formula for converting the inherent deformation data into the constrained inherent deformation data, it is calculated based on the shape before and after the welding deformation in which the member is constrained and welded at a predetermined restraint position during welding. The constraint inherent deformation data is input via the input device 12, and as shown in FIG. 11, the welding line number, the welding width, the constraint position at the time of welding, and the constraint position at the time of welding are added to the conversion formula calculation data 2. Dimensional value obtained by dividing by the constraint parameter, the longitudinal contraction amount, the lateral contraction amount, the longitudinal contraction amount of the constraint inherent deformation data that is the inherent deformation data considering the constraint conditions for the first and second members to be welded Bending amount and lateral bending amount are recorded.

  The constraint inherent deformation data calculated based on the shape before and after welding deformation in which the member is restrained and welded at a predetermined restraining position during welding is the welding deformation when the first and second members are restrained at the prescribed restraining position. From the data obtained by thermo-elasto-plastic FEM analysis and obtained from the thermo-elasto-plastic FEM analysis, specifically, the inherent strain is integrated from the inherent strain distribution data in the generation region and expressed by the above-described equations 1-8. Calculated using the formula.

  The constraint inherent deformation data for calculating the conversion equation is the same as that when calculating the inherent deformation data for calculating the conversion equation, except that the first and second members are constrained at a predetermined constraint position. The thermal elastic-plastic FEM analysis is performed at, and the intrinsic strain obtained by the thermo-elasto-plastic FEM analysis is integrated in the generation region in the same manner as when calculating the intrinsic deformation data for calculating the conversion formula. .

  Note that the longitudinal bending of the inherent deformation is recorded in the conversion formula calculation data 1 and 2 in this embodiment because the influence on the welding deformation is small when the welding deformation of the structure is analyzed by elastic FEM analysis. The longitudinal bending of the inherent deformation data and the constraint inherent deformation data is recorded as zero.

  In addition, the specific deformation data based on the shape before and after the welding deformation and the member are constrained at a predetermined restraining position without being constrained at the time of welding, which is used to calculate a conversion formula for converting the specific deformation data into the constrained natural deformation data. The constraint inherent deformation data based on the shape before and after welding deformation to be welded is calculated by other methods such as calculating by using an inverse analysis method based on the shape before and after welding deformation using thermoelastic-plastic FEM analysis. Is also possible.

  In this embodiment, inherent deformation data based on the shape before and after welding deformation that welds without constraining the member during welding, and restricted inherent deformation data based on the shape before and after welding deformation that restrains the member at a predetermined restraining position and welds Therefore, the ratio of the constraint inherent deformation data to the inherent deformation data is calculated for a plurality of constraint positions.

  Then, from the ratio of the constraint inherent deformation data to the inherent deformation data for the plurality of calculated constraint positions, a parameter in which the constraint position is made dimensionless by the welding width and the ratio of the constraint inherent deformation data to the inherent deformation data in the parameter A constant of an approximate expression that expresses the relationship is calculated, and the approximate expression is calculated as a conversion expression for converting the inherent deformation data into the constrained inherent deformation data.

The conversion formula is calculated as an exponential function according to the formula shown in Equation 9 below. Here, b ′ is a non-dimensional parameter obtained by dividing the restraint position at the time of welding by the welding width, A ₀ is the specific deformation data corresponding to the weld line, and A (b ′) corresponds to the weld line in the parameter b ′. Constraint inherent deformation data, α and β are constants determined based on the ratio of the constraint inherent deformation data to the inherent deformation data for a plurality of constraint positions.

  The conversion formula is calculated for each of the natural deformations of longitudinal shrinkage, lateral shrinkage, and lateral bending. With respect to the longitudinal bending of the inherent deformation, since there is little influence on the welding deformation when analyzing the welding deformation of the structure by the elastic FEM analysis, in this embodiment, the constraint inherent deformation data is not calculated without calculating the conversion equation. The welding deformation of the structure is analyzed by elastic FEM analysis with the longitudinal bending set to zero.

  FIG. 12 is a diagram showing data recorded in the conversion formula data file. As shown in FIG. 12, in the conversion formula data file, the conversion formula for converting the calculated inherent deformation data into the constraint inherent deformation data together with the weld line number, specifically, longitudinal contraction, lateral contraction, and lateral bending, respectively. The conversion formula is recorded.

  FIG. 13 is a diagram showing data recorded in the constraint inherent deformation result data file. In this embodiment, the inherent deformation data corresponding to the weld line is converted according to the conversion formula based on the constraint position at the time of welding, and the constraint inherent deformation data is calculated. As shown in FIG. 13, the weld line number, weld width, and restraint position are recorded in the constraint inherent deformation result data file, and the constraint inherent deformation data, specifically, the first and second members to be welded are recorded. A longitudinal shrinkage amount, a lateral shrinkage amount, and a lateral bending amount of the constraint inherent deformation data of the member are recorded. It is set to zero for the longitudinal bending of constraint inherent deformation data.

  The constraint inherent deformation data for the weld line L1 shown in FIG. 13 is the constraint inherent deformation data of the first and second members when the constraint position at the time of welding calculated using the data shown in FIGS. 10 to 12 is 40 mm. The amount of vertical shrinkage, the amount of horizontal shrinkage, and the amount of horizontal bending are shown, and the amount of vertical bending is set to zero.

Next, the operation | movement which estimates the welding deformation of the structure formed by welding a some plate-shaped member by elastic FEM analysis is demonstrated concretely.
FIG. 14 is a flowchart showing an operation for predicting welding deformation of a structure. Before predicting the welding deformation of the structure, the computer 10 first receives the graphic data of the structure, the welding method for each weld line of the structure, the welding type, the welding conditions, and the welded object via the input device 12. The first and second members that are members are registered in advance by the user. The computer 10 also registers in advance by the user, for each weld line, inherent deformation data and constraint inherent deformation data for calculating a conversion formula for converting the inherent deformation data into the restricted inherent deformation data.

  With various data registered, prediction of welding deformation of the structure is performed as shown in FIG. When calculating the welding deformation of the structure, the computer 10 acquires graphic data of the structure (step S1), acquires conditions for each weld line of the structure (step S2), and weld line condition data. Various data about the weld line recorded in the table is acquired.

  In addition, inherent deformation data for each weld line of the structure is acquired (step S3), and specific deformation data for the weld line under the same conditions as each weld line registered in the inherent deformation database, specifically, the amount of longitudinal shrinkage. The lateral contraction amount, the vertical bending amount, and the lateral bending amount are acquired.

  Next, constraint inherent deformation data is calculated in consideration of the constraint conditions in each weld line of the structure used in the elastic FEM analysis for predicting the weld deformation of the structure (step S4). Calculation of constraint inherent deformation data in each weld line will be described in detail later. When the constraint inherent deformation data for each weld line of the structure is calculated, the calculated constraint inherent deformation data is recorded in the constraint inherent deformation result data file.

  Then, the structure is divided into finite elements from the structure graphic data, and an analysis model is created. In the analysis model, the constraint inherent deformation data at each weld line of the structure recorded in the constraint inherent deformation result data file is stored. Applied, the welding deformation of the structure is calculated by elastic FEM analysis (step S5). When the welding deformation of the structure is calculated, the welding deformation of the structure as an analysis result is recorded in the welding deformation result data file and output to the output device 15 (step S6).

Next, calculation of constraint inherent deformation data in each weld line of the structure will be described.
FIG. 15 is a flowchart showing an operation for calculating the constraint inherent deformation. As shown in FIG. 15, when calculating the constraint inherent deformation data, the computer 10 converts the inherent deformation data for each weld line of the structure into constraint inherent deformation data considering the constraint conditions during welding. Is calculated (step S11).

  FIG. 16 is a flowchart showing an operation for calculating the intrinsic deformation conversion formula. As shown in FIG. 16, when calculating the specific deformation conversion formula, the computer 10 acquires the specific deformation data under unconstrained conditions based on the shape before and after the welding deformation for each weld line of the structure (step S21). ), Inherent deformation data calculated on the basis of the shape before and after welding deformation that is welded without constraining the member at the time of welding recorded in the conversion formula calculation data 1 is acquired.

  Further, for each weld line of the structure, constraint inherent deformation data under a constraint condition based on the shape before and after the welding deformation is acquired (step S22), and the member is subjected to a predetermined constraint at the time of welding recorded in the conversion formula calculation data 2. Constraint-specific deformation data calculated based on the shape before and after welding deformation that is constrained at the position and welded is acquired.

  Next, from the inherent deformation data acquired in step S21 and the constraint inherent deformation data acquired in step S22, the ratio of the constraint inherent deformation data to the inherent deformation data is calculated for each of the plurality of constraint positions for each weld line (step S23), the longitudinal deformation, lateral contraction, and lateral bending of the inherent deformation data are calculated as normalized longitudinal contraction, normalized lateral contraction, and normalized lateral bending by dividing the inherent deformation data by the restricted inherent deformation data.

  Then, from the ratio of the constraint inherent deformation data to the inherent deformation data for the plurality of constraint positions calculated in step 23, the relationship between the constraint parameter based on the constraint position and the weld width and the ratio of the constraint inherent deformation data to the inherent deformation data is obtained. A constant of the expressed approximate expression is calculated (step S24), and the approximate expression is calculated as an inherent deformation conversion expression for converting the inherent deformation data into the constraint inherent deformation data (step S25).

  Specifically, the ratio of the constraint inherent deformation data to the calculated inherent deformation data for a plurality of constraint positions is obtained by dividing the plurality of constraint positions by the weld width and taking the constraint parameter as a dimensionless value on the horizontal axis. The ratio is plotted in a graph with the vertical axis.

  Then, based on the ratio of the constraint inherent deformation data to the inherent deformation data for a plurality of plotted constraint positions, the constraint parameters obtained by making the constraint position during welding dimensionless by the welding width and the constraint inherent deformation for the inherent deformation data in the constraint parameters A constant of the approximate expression representing the relationship with the data ratio is calculated by a known least square method, and the approximate expression is calculated as an inherent deformation conversion expression. The conversion formulas are calculated for longitudinal deformation, lateral contraction, and lateral bending, which are inherent deformations. In this embodiment, the conversion formula is calculated as an exponential function according to the formula shown in Equation 9.

  FIG. 17 is a graph showing the relationship between the constraint parameter and the normalized longitudinal contraction and the inherent deformation conversion formula. As shown in FIG. 17, the constraint parameter obtained by dividing the constraint position at the time of welding by the welding width is dimensioned on the horizontal axis, and the ratio of the constraint inherent deformation data to the inherent deformation data for longitudinal contraction is normalized as longitudinal contraction. The ratio of the constraint inherent deformation data to the inherent deformation data for the longitudinal contraction is plotted on the graph taken on the axis. 17 and FIGS. 18 and 19 to be described later show the ratio of the constraint inherent deformation data to the inherent deformation data calculated using the data shown in FIGS. 10 and 11.

  For longitudinal shrinkage, from the ratio of the constraint inherent deformation data to the plotted inherent deformation data, the constraint parameter obtained by making the constraint position during welding dimensionless with the welding width, and the ratio of the constraint inherent deformation data to the inherent deformation data in the constraint parameter The approximate expression shown in the following Expression 10 that represents the relationship with the above is calculated by a known least square method, and this approximate expression is calculated as an inherent deformation conversion expression for converting the inherent deformation data into the constraint inherent deformation data.

Here, b ′ is a constraint parameter obtained by dividing the constraint position at the time of welding by the welding width, made dimensionless, Dx ₀ is the amount of longitudinal shrinkage of the inherent deformation data corresponding to the weld line, and Dx (b ′) is the constraint parameter b. This is the amount of longitudinal shrinkage of the constraint inherent deformation data corresponding to the weld line at '. The constants α and β of the exponential function according to the equation 9 are calculated as 1.5 and 0.18, respectively.

  FIG. 18 is a graph showing the relationship between the constraint parameter and the normalized lateral contraction and the inherent deformation conversion formula. As shown in FIG. 18, the constraint parameter obtained by dividing the constraint position at the time of welding by the welding width is dimensioned on the horizontal axis, and the ratio of the constraint inherent deformation data to the inherent deformation data for the lateral contraction is normalized as the transverse contraction. The ratio of the constraint inherent deformation data to the inherent deformation data for the lateral contraction is plotted on the graph taken on the axis.

  Then, for the lateral shrinkage, from the ratio of the constraint inherent deformation data to the plotted inherent deformation data, the constraint parameter obtained by making the constraint position during welding dimensionless by the welding width, and the ratio of the constraint inherent deformation data to the inherent deformation data in the constraint parameter The approximate expression shown in the following equation 11 representing the relationship with the above is calculated by a known least square method, and this approximate expression is calculated as an inherent deformation conversion expression for converting the inherent deformation data into the constraint inherent deformation data.

Here, b ′ is a constraint parameter obtained by dividing the constraint position at the time of welding by the welding width, Dy ₀ is the amount of lateral contraction of the inherent deformation data corresponding to the weld line, and Dy (b ′) is the constraint parameter b. This is the lateral shrinkage amount of the constraint inherent deformation data corresponding to the weld line at '. The constants α and β of the exponential function according to the equation 9 are calculated as 0.13 and 0.10, respectively.

  FIG. 19 is a graph showing the relationship between the constraint parameters and the normalized lateral bending and the inherent deformation conversion formula. As shown in FIG. 19, the constraint parameter obtained by dividing the constraint position at the time of welding by the welding width is dimensioned on the horizontal axis, and the ratio of the constraint inherent deformation data to the inherent deformation data with respect to the lateral bending is normalized as the horizontal bend. The ratio of the constraint inherent deformation data to the inherent deformation data for the lateral bending is plotted on the graph taken on the axis.

  Then, for lateral bending, from the ratio of the constraint inherent deformation data to the plotted inherent deformation data, the constraint parameter obtained by making the constraint position during welding dimensionless by the welding width, and the ratio of the constraint inherent deformation data to the inherent deformation data in the constraint parameter The approximate expression shown in the following Expression 12 that represents the relationship with the above is calculated by a known least square method, and this approximate expression is calculated as an inherent deformation conversion expression that converts the inherent deformation data into constraint inherent deformation data.

Here, b ′ is a constraint parameter obtained by dividing the constraint position at the time of welding by the welding width, and Ry ₀ is the lateral bending amount of the inherent deformation data corresponding to the weld line, and Ry (b ′) is the constraint parameter b. This is the lateral bending amount of the constraint inherent deformation data corresponding to the weld line at '. The constants α and β of the exponential function according to the formula shown in Equation 9 are calculated as −1.0 and 0.05, respectively.

  When the intrinsic deformation conversion formula is calculated in this way, the calculated intrinsic deformation conversion formula is recorded in the conversion formula data file, and then, as shown in FIG. 15, the conditions for the weld line acquired in step S2, Specifically, a constraint parameter is calculated based on the constraint position and welding width during welding (step S12), and a constraint parameter obtained by dividing the constraint position during welding by the welding width is calculated.

  When the constraint parameter is calculated for the weld line in step S12, the inherent deformation conversion formula calculated in step S11 is calculated from the inherent deformation data for the weld line acquired in step S3 and the constraint parameter for the weld line calculated in step S12. Is used to calculate constraint inherent deformation data in consideration of constraint conditions (step S13).

  From the amount of longitudinal shrinkage of the inherent deformation data for the weld line and the constraint parameter for the weld line, the amount of longitudinal shrinkage of the constraint inherent deformation data taking into consideration the constraint conditions is calculated using the equation shown in Equation 10, and the weld line From the lateral shrinkage amount of the inherent deformation data and the constraint parameter for the weld line, the lateral shrinkage amount of the constraint inherent deformation data in consideration of the restraint conditions is calculated using the equation shown in Equation 11, and the inherent deformation for the weld line is calculated. From the lateral bending amount of the data and the constraint parameter for the weld line, the lateral bending amount of the constraint inherent deformation data in consideration of the constraint condition is calculated using the formula shown in Equation 12.

  When the constraint inherent deformation data considering the constraint conditions is calculated from the inherent deformation data for the weld line in this way, the computer 10 records the calculated constraint inherent deformation data in the constraint inherent deformation result data file. Similarly, for each weld line of the structure, constraint inherent deformation data considering the constraint condition is calculated from the inherent deformation data for the weld line, and the calculated constraint inherent deformation data is recorded in the constraint inherent deformation result data file.

  When the constraint specific deformation data is calculated for each weld line of the structure, as described above, the structure is created by dividing the structure into finite elements from the graphic data of the structure, and the constraint specific deformation result data file is created in the analysis model. The constraint inherent deformation data for each weld line of the structure recorded in the above is applied, and the weld deformation of the structure is calculated by a known elastic FEM analysis.

  As described above, according to the present embodiment, the inherent deformation data corresponding to the weld line of the structure is converted according to a predetermined conversion formula based on the restraint position that restrains the member during welding, and the restraint inherent deformation data is calculated. Will be. As a result, it is possible to calculate the constraint inherent deformation data in consideration of the constraint condition from the inherent deformation data corresponding to the weld line. Therefore, when the welding deformation of the structure is predicted by FEM analysis, the welding deformation can be accurately predicted by relatively simple calculation by using the constraint inherent deformation data considering the constraint conditions.

  Further, when the constraint inherent deformation data is calculated according to a predetermined conversion formula, the constraint inherent deformation data is calculated using a value obtained by making the constraint position dimensionless by the welding width of the weld line as a parameter. Thereby, compared with the case where the welding width of a weld line is not considered, when welding deformation deformation of a structure is predicted by FEM analysis using constraint inherent deformation data, welding deformation can be predicted with high accuracy.

  In addition, according to the present embodiment, the inherent deformation data based on the shape before and after welding deformation that is welded with a predetermined welding width without being constrained, and the specific constraint based on the shape before and after welding deformation that is constrained and welded at a predetermined restraining position. The deformation data is acquired, and the ratio of the constraint inherent deformation data to the inherent deformation data is calculated for a plurality of constraint positions. Then, from the ratio of the constraint inherent deformation data to the inherent deformation data for a plurality of constraint positions, an approximation representing the relationship between the constraint position non-dimensional parameter with the welding width and the constraint inherent deformation data for the inherent deformation data in the parameter A constant of the formula is calculated, and the approximate formula is calculated as the conversion formula. Thereby, constraint inherent deformation data can be calculated by a relatively simple calculation for a constraint position different from the constraint position used to calculate the conversion formula.

Further, the conversion formula is such that the parameter obtained by making the constraint position dimensionless by the welding width is b ′, the inherent deformation data corresponding to the weld line is A _0, and the constraint inherent deformation data corresponding to the weld line in the parameter b ′ is Any constraint position can be obtained by calculating as an exponential function according to the relational expression of A (b ′) / A ₀ = 1 + α × exp (−β × b ′), where A (b ′) is a constant and α is β. Can also be applied.

  Further, according to the present embodiment, the weld deformation of the entire structure is calculated by elastic FEM analysis using the constraint inherent deformation data for each weld line of the calculated structure. Welding deformation can be accurately predicted with a relatively simple calculation in consideration of restraint conditions during welding.

In the above-described embodiment, the exponential function expressed by the equation 9 is used as the inherent deformation conversion equation for converting the inherent deformation data into the constraint inherent deformation data. However, a linear function expressed by the following equation 13 is used. It is also possible. Here, b ′ is a non-dimensional parameter obtained by dividing the restraint position at the time of welding by the welding width, A ₀ is the specific deformation data corresponding to the weld line, and A (b ′) corresponds to the weld line in the parameter b ′. Constraint inherent deformation data, α and β are constants determined based on the ratio of the constraint inherent deformation data to the inherent deformation data for a plurality of constraint positions.

  FIG. 20 is a graph showing the relationship between the constraint parameter and the normalized longitudinal contraction and another inherent deformation conversion formula. As shown in FIG. 20, with respect to the longitudinal shrinkage, from the ratio of the constraint inherent deformation data to the inherent deformation data plotted as in FIG. It is also possible to calculate the approximate expression shown in the following Expression 14 representing the relationship between the ratio of the constraint inherent deformation data to the inherent deformation data by the least square method, and to calculate this approximate expression as an inherent deformation conversion expression.

Here, b ′ is a constraint parameter obtained by dividing the constraint position at the time of welding by the welding width, made dimensionless, Dx ₀ is a longitudinal contraction amount of the inherent deformation data corresponding to the weld line, and Dx (b ′) is a constraint parameter b This is the amount of longitudinal shrinkage of the constraint inherent deformation data corresponding to the weld line at '. The constants α and β of the linear function according to the formula shown in Equation 13 are calculated as 1.9607 and −0.0052, respectively.

  FIG. 21 is a graph showing the relationship between the constraint parameter and the normalized lateral contraction and another inherent deformation conversion formula. As shown in FIG. 21, for the lateral contraction, from the ratio of the constraint inherent deformation data to the inherent deformation data plotted in the same manner as in FIG. It is also possible to calculate the approximate expression shown in the following Expression 15 representing the relationship with the ratio of the restricted inherent deformation data to the inherent deformation data by the least square method, and calculate this approximate expression as an inherent deformation conversion expression.

Here, b ′ is a constraint parameter obtained by dividing the constraint position at the time of welding by the welding width, Dy ₀ is the amount of lateral contraction of the inherent deformation data corresponding to the weld line, and Dy (b ′) is the constraint parameter b. This is the lateral shrinkage amount of the constraint inherent deformation data corresponding to the weld line at '. The constants α and β of the linear function according to the formula shown in Equation 13 are calculated as 1.2513 and 0.0009, respectively.

  FIG. 22 is a graph showing a relationship between the constraint parameter and the normalized lateral bending and another inherent deformation conversion formula. As shown in FIG. 22, with respect to the lateral bending, from the ratio of the constraint inherent deformation data to the inherent deformation data plotted in the same manner as in FIG. 19, the constraint parameters obtained by making the constraint position during welding dimensionless with the weld width and the constraint parameters It is also possible to calculate the approximate expression shown in the following Expression 16 representing the relationship with the ratio of the constraint inherent deformation data to the inherent deformation data by the least square method, and calculate this approximate expression as an inherent deformation conversion expression.

Here, b ′ is a constraint parameter obtained by dividing the constraint position at the time of welding by the welding width, and Ry ₀ is the lateral bending amount of the inherent deformation data corresponding to the weld line, and Ry (b ′) is the constraint parameter b. This is the lateral bending amount of the constraint inherent deformation data corresponding to the weld line at '. The constants α and β of the linear function according to the formula shown in Equation 13 are calculated as 0.0041 and 0.0034, respectively.

  As described above, even when the linear function according to the equation (13) is used as the inherent deformation conversion formula for converting the inherent deformation data into the restricted inherent deformation data, the inherent deformation data for the weld line and the constraint parameters for the weld line From the above, the constraint inherent deformation data in consideration of the constraint condition is calculated using the equation (13), specifically, the equations (14), (15), and (16).

A quadratic function represented by the following equation 17 can also be used as an inherent deformation conversion equation for converting the inherent deformation data into constrained inherent deformation data. Here, b ′ is a non-dimensional parameter obtained by dividing the restraint position at the time of welding by the welding width, A ₀ is the specific deformation data corresponding to the weld line, and A (b ′) corresponds to the weld line in the parameter b ′. The constraint inherent deformation data, α, β, and γ are constants determined based on the ratio of the constraint inherent deformation data to the inherent deformation data for a plurality of constraint positions.

  FIG. 23 is a graph showing the relationship between the constraint parameter and the normalized longitudinal contraction, and another unique deformation conversion formula. As shown in FIG. 23, regarding the vertical shrinkage, from the ratio of the constraint inherent deformation data to the inherent deformation data plotted in the same manner as in FIG. It is also possible to calculate an approximate expression shown in the following Expression 18 that represents the relationship with the ratio of the constraint inherent deformation data to the inherent deformation data by the least square method, and to calculate this approximate expression as an inherent deformation conversion expression.

Here, b ′ is a constraint parameter obtained by dividing the constraint position at the time of welding by the welding width, made dimensionless, Dx ₀ is the amount of longitudinal shrinkage of the inherent deformation data corresponding to the weld line, and Dx (b ′) is the constraint parameter b. This is the amount of longitudinal shrinkage of the constraint inherent deformation data corresponding to the weld line at '. The constants α, β, and γ of the quadratic function according to the formula shown in Equation 17 are calculated as 2.3095, −0.00143, and 0.00004, respectively.

  FIG. 24 is a graph showing a relationship between the constraint parameter and the normalized lateral contraction and another unique deformation conversion formula. As shown in FIG. 24, for the lateral contraction, from the ratio of the constraint inherent deformation data to the inherent deformation data plotted in the same manner as in FIG. It is also possible to calculate the approximate expression shown in the following Expression 19 representing the relationship with the ratio of the constraint inherent deformation data to the inherent deformation data by the least square method, and calculate this approximate expression as an inherent deformation conversion expression.

Here, b ′ is a constraint parameter obtained by dividing the constraint position at the time of welding by the welding width, Dy ₀ is the amount of lateral contraction of the inherent deformation data corresponding to the weld line, and Dy (b ′) is the constraint parameter b. This is the lateral shrinkage amount of the constraint inherent deformation data corresponding to the weld line at '. The constants α, β, and γ of the quadratic function according to the formula shown in Equation 17 are calculated as −0.2221, 0.0093, and −0.00002, respectively.

  FIG. 25 is a graph showing the relationship between the constraint parameter and the normalized lateral bending and another inherent deformation conversion formula. As shown in FIG. 25, for the lateral bending, from the ratio of the constraint inherent deformation data to the inherent deformation data plotted in the same manner as in FIG. It is also possible to calculate an approximate expression represented by the following equation 20 representing the relationship between the ratio of the constraint inherent deformation data to the inherent deformation data by the least square method, and to calculate this approximate expression as an inherent deformation conversion expression.

Here, b ′ is a constraint parameter obtained by dividing the constraint position at the time of welding by the welding width, and Ry ₀ is the lateral bending amount of the inherent deformation data corresponding to the weld line, and Ry (b ′) is the constraint parameter b. This is the lateral bending amount of the constraint inherent deformation data corresponding to the weld line at '. The constants α, β, and γ of the quadratic function according to the formula shown in Equation 17 are calculated as 0.7767, 0.0133, and −0.00005, respectively.

  As described above, even when the linear function according to the equation (17) is used as the inherent deformation conversion expression for converting the inherent deformation data into the restricted inherent deformation data, the inherent deformation data for the weld line and the constraint parameters for the weld line From the above, the constraint inherent deformation data in consideration of the constraint conditions is calculated using the equations (17), specifically, the equations (18), (19), and (20).

  In the embodiment described above, the constraint condition is considered from the inherent deformation data corresponding to the weld line L1 for the weld line L1 of the butt joint in which the first and second members M1 and M2 having the same shape and the same physical properties are butt welded. The constraint inherent deformation data is calculated, but the constraint inherent deformation data can be similarly calculated for the butt joint in which the first and second members having different shapes and physical properties are butt welded. Constraint inherent deformation data can be calculated in the same manner for other welded joints such as welds, double-sided fillet welds, and lap fillet welds.

  FIG. 26 is a diagram showing graphic data of another welded joint, FIG. 26A is a perspective view of another welded joint, and FIG. 26B is a front view of another welded joint. FIG. 26 shows a double-sided fillet joint in which the first and second members are welded on both sides as another welded joint. For both side fillet joints, constraint inherent deformation data considering the constraint conditions can be calculated from the inherent deformation data corresponding to the weld line in the same manner as the butt joint described above.

In the welded joint shown in FIG. 26, the end surface of the second member M22 is arranged substantially vertically at the center of the surface of the first member M21, and the surface of the first member M21 and the surfaces on both sides of the second member M22 are weld lines L21. in welded, in which the first member M21 is welded in a state of being constrained by the deployed restraint jig such that a distance b ₂₁ from the center of the weld line L21.

In this case, as a constraint condition, the first member M21 is simulated to be bound by the restraining jig at a position where the distance b ₂₁ from the center of the weld line L21, the distance b ₂₁ from the center of the weld line L21 the nodes of the arresting position b ₂₁ of the upper and lower fixed to compute the welding deformation. Specifically for each node in the arresting position b ₂₁ X, Y, and fixed by constraining the Z-direction, to calculate the welding distortion in the case releasing the restraint after welding. For the weld line L21, the welding width is 2bw ₂₁ , the length, width and plate thickness of the first member M21 are l ₂₁ , W ₂₁ and t ₂₁ , respectively, and the length, width and plate of the second member M22 are set. It shows the thickness as _{l 22, W 22} and _{t 22,} respectively. In this embodiment, l ₂₁ , w ₂₁ and t ₂₁ are set to 400 mm, 400 mm and 9 mm, respectively, l ₂₂ , w ₂₂ and t ₂₂ are set to 400 mm, 200 mm and 6 mm, respectively, and bw ₂₁ is set to 6 mm. Set.

FIG. 27 is a diagram showing data recorded in the weld line condition data table for another weld joint. In the double-sided fillet joint shown in FIG. 26, the first and second members that are welded members have different shapes. Therefore, as shown in FIG. 27, the weld line number, welding method, and welding are displayed in the weld line data table. The welding width, welding restraint position, current, voltage, speed and thermal efficiency as the type and welding conditions, and the material, length, width, plate thickness, Young's modulus and Poisson's ratio for the first and second members are recorded. The Incidentally, the welding width, the welding width bw ₂₁ per weld members is recorded.

The data recorded in the weld line L21 in FIG. _{27, bw 21, b 21,} I 21, V 21, v 21, η 21 is welded width of the respective welding condition, the restrained position during welding, current, voltage, speed Represents the thermal efficiency, and l ₂₁ , W ₂₁ , t ₂₁ , E ₂₁ , and ν ₂₁ represent the length, width, plate thickness, Young's modulus, and Poisson's ratio of the first member M ₂₁ , respectively, and l ₂₂ , W ₂₂ , t _22. , E ₂₂ , and ν ₂₂ indicate the length, width, plate thickness, Young's modulus, and Poisson's ratio of the second member M22, respectively.

  FIG. 28 is a diagram showing data recorded in the conversion formula calculation data table for another welded joint. 26 is also calculated based on the shape before and after welding deformation in which welding is performed without constraining a member during welding in order to calculate a conversion formula for converting from inherent deformation data to constrained inherent deformation data. 28, the conversion formula calculation data 1 includes, as shown in FIG. 28, the welding line number, the welding width, the longitudinal shrinkage amount of the inherent deformation data for the first and second members that are welded members, The amount of horizontal shrinkage, the amount of vertical bending, and the amount of horizontal bending are recorded.

  Inherent deformation data calculated based on the shape before and after welding deformation that welds without constraining the member at the time of welding is obtained by performing thermoelastic-plastic FEM analysis on the welding deformation when welding without restraining the first and second members. Calculated from the data obtained by thermo-elasto-plastic FEM analysis, specifically, the inherent strain is integrated from the inherent strain distribution data in the generation region, and is calculated using the equations shown in the above formulas 1-8. The

  FIG. 29 is a diagram showing another data recorded in the conversion formula calculation data table for another welded joint. For both side fillet joints shown in FIG. 26 as well, based on the shape before and after welding deformation, which is constrained and welded at a predetermined restraint position during welding, in order to calculate a conversion formula for converting the inherent deformation data into constrained inherent deformation data. The calculated constraint inherent deformation data is input, and as shown in FIG. 29, the welding formula number 2 is divided into the welding line number, the weld width, the restraint position during welding, and the restraint position during welding by the weld width. The dimensionless constraint parameters and the longitudinal shrinkage amount, lateral shrinkage amount, vertical bending amount, and lateral bending amount of the constraint inherent deformation data are recorded for the first and second members that are welded members.

  The constraint inherent deformation data calculated based on the shape before and after welding deformation in which the member is restrained and welded at a predetermined restraining position during welding is the welding deformation when the first and second members are restrained at the prescribed restraining position. From the data obtained by thermo-elasto-plastic FEM analysis and obtained from the thermo-elasto-plastic FEM analysis, specifically, the inherent strain is integrated from the inherent strain distribution data in the generation region and expressed by the above-described equations 1-8. Calculated using the formula. As described above, in this embodiment, the longitudinal deformation of the inherent deformation data and the constraint inherent deformation data recorded in the conversion formula calculation data 1 and 2 is recorded as zero.

  In the inherent deformation database, for both side fillet joints, as shown by the number 4 in FIG. 8, the inherent deformation data corresponding to the weld line is displayed together with condition information such as the welding method, welding type, welded member, and welding conditions. Registered in advance.

  Also in the case of both-side fillet joints, inherent deformation data based on the shape before and after welding deformation that is welded without restraining the member during welding and restraint based on the shape before and after welding deformation that restrains the member at a predetermined restraining position and welds From the inherent deformation data, a ratio of the constraint inherent deformation data to the inherent deformation data is calculated for a plurality of constraint positions.

  Then, from the ratio of the constraint inherent deformation data to the calculated inherent constraint data for a plurality of constraint positions, the constraint position is divided by the welding width to make a dimensionless parameter, and the constraint inherent deformation data for the inherent deformation data in the parameter A constant of the approximate expression representing the relationship with the ratio is calculated, and the approximate expression is calculated as a conversion expression for converting the specific deformation data into the constraint specific deformation data.

  Specifically, the ratio of the constraint inherent deformation data to the calculated inherent deformation data for a plurality of constraint positions is obtained by dividing a constraint parameter that is a dimensionless value obtained by dividing the plurality of constraint positions by the weld width. Plotted on a graph with the ratio on the vertical axis.

  Then, based on the ratio of the constraint inherent deformation data to the inherent deformation data for a plurality of plotted constraint positions, the constraint parameters obtained by making the constraint position during welding dimensionless by the welding width and the constraint inherent deformation for the inherent deformation data in the constraint parameters A constant of the approximate expression representing the relationship with the data ratio is calculated by a known least square method, and the approximate expression is calculated as an inherent deformation conversion expression. The conversion formulas are calculated for the natural deformation of longitudinal contraction, lateral contraction, and lateral bending, respectively, and are calculated as an exponential function according to the formula (9).

  FIG. 30 is a graph showing the relationship between the constraint parameter of the first member and the normalized longitudinal contraction and the inherent deformation conversion formula for another welded joint, and shows the first member of the double-sided fillet joint shown in FIG. Yes. As shown in FIG. 30, the horizontal axis represents the dimensionless constraint parameter obtained by dividing the welding constraint position by the welding width and normalizes the ratio of the constraint inherent deformation data to the inherent deformation data for the longitudinal contraction of the first member. The ratio of the constraint specific deformation data to the specific deformation data for the vertical contraction of the first member is plotted on the graph having the vertical axis as the vertical contraction. 30 and FIGS. 31 and 32, which will be described later, show the ratio of the constraint inherent deformation data to the inherent deformation data calculated using the data shown in FIGS.

  Then, regarding the longitudinal contraction of the first member, from the ratio of the constraint inherent deformation data to the plotted inherent deformation data, the constraint parameter obtained by making the constraint position during welding dimensionless by the welding width and the constraint inherent to the inherent deformation data in the constraint parameter The approximate expression shown in the following Expression 21 representing the relationship with the ratio of the deformation data is calculated by a known least square method, and this approximate expression is calculated as an inherent deformation conversion expression for converting the inherent deformation data into the constraint inherent deformation data. The

Here, b ′ is a constraint parameter obtained by dividing the constraint position at the time of welding by the welding width, and Dx ₁₀ is a longitudinal contraction amount of the inherent deformation data of the first member corresponding to the weld line, Dx ₁ (b ′ ) Is the vertical contraction amount of the constraint inherent deformation data of the first member corresponding to the weld line in the constraint parameter b ′. The constants α and β of the exponential function according to the equation 9 are calculated as 1.5 and 0.15, respectively.

  FIG. 31 is a graph showing the relationship between the constraint parameter of the first member and the normalized lateral contraction and the natural deformation conversion formula for another welded joint, and the first member of the double-sided fillet joint shown in FIG. Show. As shown in FIG. 31, the constraint parameter obtained by dividing the constraint position at the time of welding by the welding width is dimensioned on the horizontal axis, and the ratio of the constraint inherent deformation data to the inherent deformation data for the vertical contraction of the first member is normalized. The ratio of the constraint specific deformation data to the specific deformation data for the horizontal contraction of the first member is plotted on the graph with the vertical axis as the horizontal contraction.

  Then, for the lateral contraction of the first member, from the ratio of the constraint inherent deformation data to the plotted inherent deformation data, the constraint parameter obtained by making the constraint position during welding dimensionless with the weld width and the constraint inherent to the inherent deformation data in the constraint parameter The approximate expression shown in the following Expression 22 representing the relationship with the ratio of the deformation data is calculated by a known least square method, and this approximate expression is calculated as an inherent deformation conversion expression for converting the inherent deformation data into the constrained inherent deformation data. The

Here, b ′ is a restraint parameter obtained by dividing the restraint position at the time of welding by the welding width, and Dy ₁₀ is a lateral contraction amount of the inherent deformation data of the first member corresponding to the weld line, Dy ₁ (b ′ ) Is a lateral contraction amount of the constraint inherent deformation data of the first member corresponding to the weld line in the constraint parameter b ′. The constants α and β of the exponential function according to the formula shown in Equation 9 are calculated as 0.13 and 0.05, respectively.

  FIG. 32 is a graph showing the relationship between the constraint parameter of the first member and the normalized transverse bending and the natural deformation conversion formula for another welded joint, and the first member of the double-sided fillet joint shown in FIG. Show. As shown in FIG. 32, the constraint parameter obtained by dividing the constraint position at the time of welding by the welding width is taken on the horizontal axis, and the ratio of the constraint inherent deformation data to the inherent deformation data is normalized for the lateral bending of the first member. The ratio of the constraint specific deformation data to the specific deformation data for the horizontal bending of the first member is plotted on the graph taken as the vertical axis as the horizontal bending.

  For the lateral bending of the first member, from the ratio of the constraint inherent deformation data to the plotted inherent deformation data, the constraint parameter obtained by making the constraint position during welding dimensionless by the weld width and the constraint inherent to the inherent deformation data in the constraint parameter The approximate expression shown in the following Expression 23 that expresses the relationship with the ratio of the deformation data is calculated by a known least square method, and this approximate expression is calculated as an inherent deformation conversion expression that converts the inherent deformation data into constrained inherent deformation data. The

Here, b ′ is a constraint parameter obtained by dividing the constraint position at the time of welding by the welding width, and Ry ₁₀ is the lateral bending amount of the inherent deformation data of the first member corresponding to the weld line, Ry ₁ (b ′ ) Is the lateral bending amount of the constraint inherent deformation data of the first member corresponding to the weld line in the constraint parameter b ′. The constants α and β of the exponential function according to the formula shown in Equation 9 are calculated as −1.0 and 0.025, respectively.

  Similarly to the first member, the second member of the fillet joint on both sides is obtained by dividing the constraint position by the welding width from the ratio of the constraint inherent deformation data to the calculated inherent deformation data for the plurality of constraint positions. A constant of an approximate expression that expresses the relationship between the dimensionless parameter and the ratio of the constraint inherent deformation data to the inherent deformation data in the parameter is calculated by a known least square method, and the approximate expression defines the inherent deformation data as the constraint inherent It is calculated as a conversion formula for converting into deformation data.

  Then, when the intrinsic deformation conversion formula is calculated for the first and second members, from the inherent deformation data for the weld line L21 and the constraint parameters for which the constraint position at the time of welding for the weld line L21 is dimensionless with the weld width, Constraint inherent deformation data considering the constraint condition is calculated using the inherent deformation conversion formula.

  As described above, in the case of the double-sided fillet joint in which the first and second members are both-side fillet welded, in the same manner as in the butt joint, the constraint inherent deformation data considering the constraint condition from the inherent deformation data corresponding to the weld line. Can be calculated.

  The present invention is not limited to the illustrated embodiments, and various improvements and design changes can be made without departing from the scope of the present invention.

  As described above, according to the present invention, from the inherent deformation data corresponding to the weld line, it is possible to calculate the constraint inherent deformation data considering the constraint conditions during welding, and a structure formed by welding a plurality of members In the case of predicting the welding deformation, there is a possibility that it is preferably used.

10 Computer 11 Central Processing Unit 12 Input Unit 13 Display Unit 14 Storage Unit 15 Output Unit 20 Inherent Deformation Database

Claims (8)

A calculation system for constraint inherent deformation data in consideration of constraint conditions used when predicting weld deformation of a structure formed by welding a plurality of members by FEM analysis,
Inherent deformation data acquisition means for acquiring inherent deformation data corresponding to the weld line of the structure;
A restraint position obtaining means for obtaining a restraint position for restraining the member during welding;
Constraint inherent deformation data calculation for converting the inherent deformation data acquired by the inherent deformation data acquisition means and calculating the constraint inherent deformation data based on the constraint position acquired by the constraint position acquisition means according to a predetermined conversion formula Means,
And a weld width obtaining means for obtaining a welding width of the weld line,
The constraint inherent deformation data calculating means calculates the constraint inherent deformation data acquired by the constraint width acquisition means by the welding width acquired by the weld width acquisition means when calculating the constraint inherent deformation data according to the predetermined conversion formula. Calculate constraint-specific deformation data using the dimensionless value as a parameter,
Computing system captive specific modification data you wherein a. Conversion formula calculating means for calculating the conversion formula;
The conversion formula calculation means includes the specific deformation data based on the shape before and after welding deformation that welds with a predetermined welding width without constraining the member during welding, and before and after welding deformation that constrains and welds the member at a predetermined constraining position. The constraint inherent deformation data based on the shape of the acquired constraint deformation, the ratio of the constraint inherent deformation data to the acquired inherent deformation data is calculated for a plurality of constraint positions, and the calculated inherent deformation for the plurality of constraint positions From the ratio of the constraint inherent deformation data to the data, calculate a constant of an approximate expression representing the relationship between the parameter where the constraint position is dimensionless with the welding width and the ratio of the constraint inherent deformation data to the inherent deformation data in the parameter, Calculating the approximate expression as the conversion expression;
The calculation system for constraint inherent deformation data according to claim 1 . The conversion formula calculating unit, the conversion formula, and b'parameters dimensionless the arresting position by welding width, the unique deformation data corresponding to the weld line and A _0, corresponding to the weld line in the parameter b' The constraint inherent deformation data is A (b ′), and constants determined based on the ratio of the constraint inherent deformation data to the inherent deformation data for a plurality of constraint positions are α and β, and calculated as an exponential function according to the following relational expression. To
The calculation system for constraint inherent deformation data according to claim 2 .
A (b ′) / A ₀ = 1 + α × exp (−β × b ′) A welding deformation prediction system for predicting welding deformation of a structure formed by welding a plurality of members by FEM analysis,
As means for obtaining constraint inherent deformation data considering the constraint conditions for each weld line of the structure,
Inherent deformation data acquisition means for acquiring inherent deformation data corresponding to the weld line of the structure;
A restraint position obtaining means for obtaining a restraint position for restraining the member during welding;
Constraint inherent deformation data calculation for converting the inherent deformation data acquired by the inherent deformation data acquisition means and calculating the constraint inherent deformation data based on the constraint position acquired by the constraint position acquisition means according to a predetermined conversion formula Means and
Applying the constraint inherent deformation data of each weld line calculated by the constraint inherent deformation data calculation means to the analysis model created by dividing the structure into finite elements, and calculating the weld deformation of the structure by elastic FEM analysis a welding deformation calculating means for possess,
As means for acquiring constraint inherent deformation data in consideration of constraint conditions for each weld line of the structure, further comprising a weld width acquisition means for acquiring the weld width of the weld line,
The constraint inherent deformation data calculating means calculates the constraint inherent deformation data acquired by the constraint width acquisition means by the welding width acquired by the weld width acquisition means when calculating the constraint inherent deformation data according to the predetermined conversion formula. Calculate constraint-specific deformation data using the dimensionless value as a parameter,
A welding deformation prediction system characterized by that. A calculation program for constraint inherent deformation data considering constraint conditions used when predicting welding deformation of a structure formed by welding a plurality of members by FEM analysis,
A specific deformation data acquisition means for acquiring a specific deformation data corresponding to the weld line of the structure;
A restraint position obtaining means for obtaining a restraint position for restraining the member during welding; and
Constraint inherent deformation data calculation for converting the inherent deformation data acquired by the inherent deformation data acquisition means and calculating the constraint inherent deformation data based on the constraint position acquired by the constraint position acquisition means according to a predetermined conversion formula Function as a means,
The computer is further made to function as welding width acquisition means for acquiring the welding width of the welding line,
When the computer functions as the constraint inherent deformation data calculation means, the constraint position acquired by the constraint position acquisition means is acquired as the welding width when the constraint inherent deformation data is calculated according to the predetermined conversion formula. Function to calculate constraint inherent deformation data using as a parameter the dimensionless value of the weld width acquired by the means,
It shall be the said captive-specific modification data calculation program. Further causing the computer to function as a conversion formula calculation means for calculating the conversion formula,
When the computer is caused to function as the conversion formula calculating means, the inherent deformation data based on the shape before and after welding deformation, which is welded with a predetermined welding width without constraining the member during welding, and the member at a predetermined restraint position. Restraint inherent deformation data based on the shape before and after welding deformation to be restrained and welded, calculate a ratio of the restraint inherent deformation data to the obtained inherent deformation data for a plurality of restraint positions, and calculate the plurality From the ratio of the constraint inherent deformation data to the inherent deformation data with respect to the constraint position, the relationship between the parameter obtained by making the constraint position dimensionless by the welding width and the ratio of the constraint inherent deformation data to the inherent deformation data in the parameter is expressed. Calculating a constant of an approximate expression, and causing the approximate expression to function as the conversion expression;
6. The program for calculating constraint-specific deformation data according to claim 5 . The computer, when the function as the conversion formula calculating unit, the conversion formula, the parameters dimensionless by welding width restrained position and b', the intrinsic deformation data corresponding to the weld line and A _0, the parameter b The constraint inherent deformation data corresponding to the weld line at ′ is A (b ′), and constants determined based on the ratio of the constraint inherent deformation data to the inherent deformation data for a plurality of constraint positions are α and β, as follows: Function to calculate as an exponential function with relational expression,
The calculation program for constraint inherent deformation data according to claim 6 .
A (b ′) / A ₀ = 1 + α × exp (−β × b ′) A welding deformation prediction program for predicting welding deformation of a structure formed by welding a plurality of members by FEM analysis,
As a means for acquiring constraint inherent deformation data in consideration of constraint conditions for each weld line of the structure,
Inherent deformation data acquisition means for acquiring inherent deformation data corresponding to the weld line of the structure,
A restraint position obtaining means for obtaining a restraint position for restraining the member during welding; and
Constraint inherent deformation data calculation for converting the inherent deformation data acquired by the inherent deformation data acquisition means and calculating the constraint inherent deformation data based on the constraint position acquired by the constraint position acquisition means according to a predetermined conversion formula Function as a means,
The computer further applies the constraint inherent deformation data of each weld line calculated by the constraint inherent deformation data calculation means to an analysis model created by dividing the structure into finite elements, and the structure is analyzed by elastic FEM analysis. Function as a welding deformation calculation means for calculating the welding deformation of the body ,
The computer further functions as a welding width acquisition unit that acquires a welding width of the welding line as a unit that acquires constraint inherent deformation data considering a constraint condition for each welding line of the structure,
When the computer functions as the constraint inherent deformation data calculation means, the constraint position acquired by the constraint position acquisition means is acquired as the welding width when the constraint inherent deformation data is calculated according to the predetermined conversion formula. Function to calculate constraint inherent deformation data using as a parameter the dimensionless value of the weld width acquired by the means,
A welding deformation prediction program characterized by that.