JP2004330212A - Analysis method for welded structure and analysis device for welded structure - Google Patents

Analysis method for welded structure and analysis device for welded structure Download PDF

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Publication number
JP2004330212A
JP2004330212A JP2003125673A JP2003125673A JP2004330212A JP 2004330212 A JP2004330212 A JP 2004330212A JP 2003125673 A JP2003125673 A JP 2003125673A JP 2003125673 A JP2003125673 A JP 2003125673A JP 2004330212 A JP2004330212 A JP 2004330212A
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Japan
Prior art keywords
welding
element
welded structure
line
welding line
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Pending
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JP2003125673A
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Japanese (ja)
Inventor
Daijiro Fukuda
Takao Inukai
Yoshiyasu Ito
Kazuhiro Saito
Kazutoshi Takaishi
Akira Tanaka
義康 伊藤
隆夫 犬飼
明 田中
大二郎 福田
和年 高石
和宏 齊藤
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Toshiba Corp
株式会社東芝
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Priority to JP2003125673A priority Critical patent/JP2004330212A/en
Publication of JP2004330212A publication Critical patent/JP2004330212A/en
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Abstract

To analyze welding deformation and residual stress of a welded structure using a finite element method, an analysis method of a welded structure and an analysis device for a welded structure capable of estimating welding deformation and residual stress with higher accuracy. provide.
A welding operation condition setting step 2 for setting a welding type of a welding line and a heat input condition of a welding temperature, and a step 3 for dividing the set welding line into welding line elements composed of element units of an FEM model. Step 6 of calculating an intrinsic strain distribution determined according to the type of welding, the heat input, and the distance from the welding line for each of the elements constituting the finite element model; and calculating the intrinsic strain of each of the calculated individual elements in the welding structure. Step 8 of converting the coordinate system into at least one of the overall coordinate system and the local coordinate system of the element, and Step 9 of generating FEM analysis data for applying the coordinate-transformed intrinsic strain to each element as a load condition. It is a method to have.
[Selection] Figure 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for analyzing a welded structure and a welded structure for estimating a weld deformation and a residual stress of a structure generated by the influence of thermal strain generated when welding the structure using an intrinsic strain method. To an analysis device.
[0002]
[Prior art]
In the industrial field of welded structures, research is underway to estimate the welding deformation and residual stress of structures generated by the thermal effect of welds generated when welding structures using the intrinsic strain method. ing.
[0003]
Here, the eigenstrain method is used to estimate the welding deformation and residual stress of a welded structure by first measuring the inherent welding deformation and residual stress generated in the actual welded structure, A database is obtained by FEM analysis, and appropriate values are then given to the modeled welded structure from among the strain values and the like stored in the database, and welding deformation and residual stress are determined using an FEM (finite element method) analysis method. It is a technique for estimating the like.
[0004]
This method selects and uses an appropriate value from among the inherent strains of the welded structure, etc., which have been made into a database in advance, and calculates welding deformation etc. by linear analysis, so the shape of the structure is complicated, Even in the case of a large size, the convenience is high in that the welding deformation and the like of the structure can be estimated in a short time as compared with the thermo-elasto-plastic FEM structural analysis.
[0005]
Techniques for estimating the welding deformation and residual stress of a welded structure using the inherent strain method include, for example, the 70th Annual Meeting of the Japan Welding Society (2002-4), “Optimal Welding Deformation for Complex Shapes Using the Eigenstrain Method. (Non-Patent Document 1), Japanese Patent Application Laid-Open No. 7-75835 (Patent Document 1), and Japanese Patent Application Laid-Open No. 10-146621 (Patent Document 2), "Bending method of metal plate by linear heating". The literature has been published.
[0006]
[Non-patent document 1]
Proceedings of the National Meeting of Welding Society, Vol. 70 (2002-4) "Optimization of Welding Deformation of Complex Shapes Using Eigenstrain Method"
[0007]
[Patent Document 1]
JP-A-7-75835
[Patent Document 2]
Japanese Patent Application Laid-Open No. Hei 10-146621
[Problems to be solved by the invention]
The FEM analysis method used when estimating welding deformation, residual stress, etc. of a welded structure, models an actual welded structure, and converts the modeled welded structure into a predetermined shape such as a quadrilateral. A so-called mesh division is performed, in which each element is finely divided, and the deformation (deformation) of the welded structure is determined based on the continuity of the force (stress) and displacement (strain) of each divided element and the force and displacement of the entire welded structure. This is a calculation method for estimating residual stress, etc., and by inputting and calculating the strain of an appropriate distribution corresponding to the thermal strain generated by welding to the constituent elements of the model, that is, the intrinsic strain, the structure and shape are complicated. Even if there is, change and residual stress can be estimated in a relatively short time. However, some problems still remain, one of which is consistency between the coordinate system of the entire analytical model and the coordinate system that determines the intrinsic strain distribution around the weld line.
[0010]
That is, when estimating the intrinsic strain and residual stress of a welded structure using the FEM analysis method, the coordinate system includes, in addition to the coordinate system of the entire structure as an analysis model, a divided element of the modeled welded structure. There are three types of coordinates: a local coordinate system determined by the characteristics of the above, the direction of the welding line of the welded structure, and an intrinsic strain coordinate system determined by the welding work position.
[0011]
If these three coordinate systems do not have consistency, there is a problem that even if a distortion value prepared in a database is given to each divided element, an error is large, and in some cases, an inherent distortion value far from the actual one is obtained. Normally, the FEM analysis model is often modeled so that these coordinate systems coincide with each other. However, in the case of a three-dimensional structure having a complicated shape or when the direction of the welding line extends over many directions, the coordinates of the FEM analysis model are used. It is difficult to make a model while matching the coordinate system between the welding system and the welding line. Further, depending on the type of the element used, a problem relating to matching with the local coordinate system is further added for each element. These tend to be particularly high in a three-dimensional welded structure having a curved surface, a sharp notch or a sharp intersection.
[0012]
Therefore, at the stage of the FEM analysis model, a high-precision intrinsic strain value or the like is given to the FEM analysis data using a simple method without maintaining the consistency of the local coordinate system caused by the direction of the welding line and the element type. It has been desired to realize a method for analyzing welded structures that can estimate welding deformation and residual stress distribution with high accuracy.
[0013]
The present invention has been made in view of the above circumstances, and gives a database of specific strain values and the like to a modeled welded structure, and uses the finite element method to perform welding deformation and residual stress of the welded structure. It is an object of the present invention to provide a method for analyzing a welded structure and an apparatus for analyzing a welded structure, which can estimate welding deformation and residual stress with higher accuracy when analyzing the welding structure.
[0014]
[Means for Solving the Problems]
In the method for analyzing a welded structure according to the present invention, the position of the weld line and the direction of the weld line are specified on the basis of the mesh division of the finite element model of the welded structure. A welding operation condition setting step of setting a welding type of a welding line and a heat input condition of a welding temperature; a step of dividing the set welding line into welding line elements composed of element units of an FEM model; While determining the direction, calculating the distance and direction between the elements constituting the finite element model of the welded structure and the welding line elements, for each element constituting the finite element model, the type of welding and heat input Calculating the intrinsic strain distribution determined according to the distance from the welding line, and the calculated intrinsic strain of each element of the overall coordinate system of the welded structure and the local coordinate system of the element, A method comprising the steps of creating and converting either one of the coordinate system, the FEM analysis data given as loading conditions of the inherent strain was coordinate transformation into individual elements even without.
[0015]
In the method for analyzing a welded structure according to the present invention, the position of the weld line and the direction of the weld line are specified by specifying an element obtained by dividing the model of the welded structure into meshes. How to do it.
[0016]
Further, in the method for analyzing a welded structure according to the present invention, the position of the weld line and the direction of the weld line are specified by selecting nodes in the element obtained by dividing the model of the welded structure into meshes. It is a method to specify.
[0017]
In the method for analyzing a welded structure according to the present invention, the position of the weld line and the designation of the direction of the weld line are determined by meshing a model of the welded structure, This method is performed by designating a combination of the nodes in the table.
[0018]
Further, in the method for analyzing a welded structure according to the present invention, the position of the weld line and the direction of the weld line are specified by a pen pointer in the model of the welded structure shown on the CRT screen. , A mouse, or a number key, and specifying at least one of an element, a node, a straight line, a curve, and an arc.
[0019]
Also, in the method for analyzing a welded structure according to the present invention, the step of the welding condition includes selecting the type of welding and the heat input condition of the welding temperature from the inherent strain database. This is a method in which a model of an object is given to at least one of an element, a node, and a combination thereof obtained by mesh division.
[0020]
The welding structure analysis apparatus according to the present invention, as described in claim 7, specifies the position of the welding line and the direction of the welding line with reference to the mesh division of the finite element model of the welding structure, Means for setting the welding operation conditions for designating the type of welding of the welding line and the heat input conditions for the welding temperature; means for dividing the set welding line into welding line elements composed of element units of the FEM model; Determine the direction of the line elements, while calculating the distance and direction between the elements constituting the finite element model of the welding structure and the welding line element, for the individual elements constituting the finite element model of the welding structure, Means for calculating the intrinsic strain distribution determined according to the type of welding, the heat input, and the distance from the welding line, and the calculated intrinsic strain of each element in the entire welded structure coordinate system and the local coordinate system of the element, And has a means for creating and means for converting either one of the coordinate system, the FEM analysis data given as loading conditions of the inherent strain was coordinate transformation into individual elements even without.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a method for analyzing a welded structure and an apparatus for analyzing the same according to the present invention will be described with reference to the drawings and reference numerals attached to the drawings.
[0022]
FIG. 1 is a block diagram showing an embodiment of a method for analyzing a welded structure and an apparatus for analyzing the same according to the present invention.
[0023]
In the present embodiment, first, a welded structure is modeled, initial data, specifically, geometrical information is given to the modeled welded structure, and mesh division is performed. Information is provided (step 1).
[0024]
Next, in the present embodiment, after setting welding operation conditions by giving information on welding operation conditions to the modeled welded structure (step 2), the welding line of the modeled welded structure is changed for each welding line element. Divide (step 3).
[0025]
The welding structure divided for each welding line element determines the direction of the welding line element, for example, the axial direction, the width direction, the depth direction (step 4), and the individual elements mesh-divided in step 1 and the step The distance and direction with respect to the welding line element divided in step 3 are calculated (step 5), and the intrinsic strain of each element divided in mesh in step 1 is calculated (step 6).
[0026]
When the calculation of the intrinsic strain of each element is completed, in the present embodiment, the component of the intrinsic strain of each element obtained in step 6 described above is converted into a global coordinate system (step 7), and the specific strain obtained in step 7 is further converted. After converting each component of the strain into a local coordinate system corresponding to the FEM element type (step 8), FEM analysis data to which the intrinsic strain is input is created (step 9), FEM analysis calculation is performed (step 10), and welding is performed. The welding deformation and residual stress of the structure are calculated and estimated (step 11).
[0027]
FIG. 2 is a conceptual procedure diagram for explaining the details of each step shown in FIG. 1 in a little more detail.
[0028]
In step 1, when dividing the modeled welded structure into meshes, for example, a specific shape such as a triangle or a quadrilateral is specified, and each of the specified shapes is used as an “element”. While several "nodes" are specified for each "element", materials are specified for each "element".
[0029]
In step 1, data of material characteristics such as Young's modulus and Poisson's ratio, load such as external force and heat, and boundary conditions such as displacement constraint are given to each "element" divided into meshes.
[0030]
Step 2 is based on the information of Step 1 in FIG. 3. In FIG. 3, “weld axial direction”, “weld width direction”, “weld direction” in each of the welded portions 1, 2,. Whether the designated technical items in the “depth direction” are given to “elements” or “nodes” A, B, C,... Of the welded parts 1, 2,. Or "elements" a, b,... Shown in (c), "nodes" and / or "elements", or "nodes", "elements", or "nodes" and "elements" based on "elements". While giving as the arrangement of the combination, and appropriately selected from the intrinsic strain database, for example, the type of welding, such as submerged arc welding, and the heat input welding conditions, such as, for example, the welding temperature, these "nodes", and or " To a welding line consisting of a sequence of "elements".
[0031]
The position of the welding line and the direction of the welding line can be specified not only by directly specifying nodes and elements using a pen pointer, a mouse, a number key, etc., but also by using a line segment in the finite element analysis model transmitted on the CRT screen. , Curves, arcs, etc., by designating a figure representing the welding line.
[0032]
Further, even when the position of the welding line is out of the arrangement of the elements and nodes, the position of the welding line can be determined by inputting the offset amount in the same manner. Thus, a set of a plurality of welding lines obtained by dividing the welding lines at the element size level can be obtained.
[0033]
In step 3, based on the information in step 1 and step 2, the welding line of the welded portions 1, 2, ... in the modeled welded structure is divided for each "welding line element". That is, the “weld line element” is a welded part 1 partitioned into “elements” having “nodes” A, B, and C shown in FIG. 4A, and an “element” having “nodes” D, E, and F. As shown in FIG. 4B, for example, the welded portion 1 is divided into welding line elements (1), (2),.
[0034]
In step 3, the welded parts 1, 2, ... are divided into "weld line elements" (1), (2), ..., and in step 4, the divided "weld line elements" (1), (2), ... The direction is designated for each, and the directions of the designated “welding line elements” (1), (2),.
[0035]
The “welding line elements” (1), (2),... Made in this database are specifically “joint points” A, “A” in the welded part 1 of the modeled welded structure shown in FIG. B and C are designated by "nodes" D, E, and F for the welded portion 2, respectively, and selected from the designated "nodes" A, B, C,. For example, as shown in (c) and (d), "weld line elements" (1), (2),. Each technical item of “direction” and “weld depth direction” is specified.
[0036]
In step 4, as shown in FIG. 6, the “weld line direction” V is assigned to each of the “weld line elements” (1), (2),. 1, "welding width" V 2, that specifies the respective "weld depth" V 3.
[0037]
The designation of these directions is performed in the following procedure when the welding line is determined by the arrangement of the nodes. First, when the arrangement of the two nodes constituting the welding line element is determined, the welding line direction can be determined. Further, when an element to which both of these nodes belong is determined, two elements and two nodes are determined, so that a surface not shared with other elements and nodes can be extracted. From the representative points of these surfaces, for example, the center, the weld line width direction can be defined, and further, the weld line depth direction is determined. When the welding line is specified by the arrangement of the elements, the first welding line direction is determined by taking a representative point from the representative point of the element, the center point of the surface of the element, and the like.
[0038]
On the other hand, in step 5, as shown in FIG. 7, each of the "welding line elements" (1), (2),... And find the number K of the “welding line element” that minimizes the distance Δi (Δ3, Δ4, Δ5) (in FIG. 7, the distance between the “element” n and the “welding line element” (4) is short). Δ4), the position of the “element” n and the number “K” of the “welding line element”, specifically, the distance in the welding line axis direction, the welding line width direction, and the welding line depth direction are calculated.
[0039]
In step 5, the respective distances in the welding line axis direction, the width direction, and the depth direction of the “welding line element” closest to the “element” n are calculated. In step 6, (a) in FIG. As shown in), after applying the inherent strain in the welding line axis direction, width direction, and depth direction of the "welding line element" in the database to the "element", the inherent strain in the welding construction axis direction and the welding construction Calculate the intrinsic strain in the width direction and the inherent strain in the welding depth direction.
[0040]
In step 7, the inherent strain in each direction calculated in step 6 is determined. In step 7, a welding line that determines each of the welding axis direction, the welding width direction, and the welding depth direction of the “welding line element” illustrated in FIG. The elemental coordinate system is converted from the intrinsic strain in each direction shown in FIG.
[0041]
In step 7, the welding line element local coordinate system is converted into the entire coordinate system of the entire welded structure. For example, as shown in FIG. 10A, in the case of a steam turbine nozzle diaphragm, the entire coordinate system is used. May be converted to a local coordinate system of a plate-shaped divided element. In this case, step 8 is added.
[0042]
After performing the coordinate transformation of each direction component of the intrinsic strain in step 7 or step 8, in step 9, as shown in FIG. 2, the data is converted into data equivalent to the intrinsic strain, and the information from step 1 is converted into the converted data. The FEM analysis data is created with reference to the data.
[0043]
As a method of giving the intrinsic strain, a stress equivalent to the strain given to each element is given to the integration point of each element, or a linear expansion coefficient equivalent to the strain is given to the physical property value of each element, and then a thermal load is given. Alternatively, there is a method in which an external force is applied to an integration point constituting an element to obtain an equivalent strain. Based on this data, calculation is performed in step 10, welding deformation and residual stress are output in the final step 11, and welding deformation and the like of the welded structure are estimated.
[0044]
【The invention's effect】
As described above, the welding structure analysis method and the welding structure analysis apparatus according to the present invention specify the position of the welding line and the direction of the welding line with reference to the mesh division of the finite element model of the welding structure. On the other hand, a welding execution condition setting step of setting a welding type of the welding line and a heat input condition of a welding temperature, a step of dividing the set welding line into welding line elements composed of element units of the FEM model, Determining the direction of the weld line element, and calculating the distance and direction between the elements constituting the finite element model of the welded structure and the weld line element, while the individual elements constituting the finite element model of the welded structure Calculating the intrinsic strain distribution determined according to the type of welding, the heat input, and the distance from the welding line, and applying the calculated intrinsic strain of each element to the overall coordinate system of the welded structure. Converting at least one of the local coordinate systems of the elements into a coordinate system, creating FEM analysis data for applying the coordinate-transformed intrinsic strain to each element as a load condition, performing FEM analysis, and performing welding. Since a new method of estimating welding deformation or the like by calculating deformation or the like is constructed, it is possible to estimate welding deformation or the like with higher accuracy than before.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a welding structure analysis method and a welding structure analysis apparatus according to the present invention.
FIG. 2 is a conceptual procedure diagram for explaining the contents of each step shown in FIG. 1;
3A and 3B are views for explaining the contents of step 2 shown in FIGS. 1 and 2, wherein FIG. 3A is a view showing a welded portion of an actual welded structure, and FIG. 3B is a mesh division of a modeled welded structure; The figure which shows the node of the welded part which carried out, (c) The figure which shows the element of the mesh-divided welded part of the modeled welding structure.
4A and 4B are views for explaining the contents of step 3 shown in FIGS. 1 and 2, wherein FIG. 4A is a view showing welding line elements of a welded portion obtained by dividing a modeled welding structure into meshes, and FIG. FIG. 4 is a block diagram showing a set of welding line elements and nodes of a welded portion obtained by dividing a modeled welded structure into meshes.
FIGS. 5A and 5B are diagrams for explaining the contents of step 4 shown in FIGS. 1 and 2, wherein FIG. 5A is a diagram showing nodes of a welding portion, and FIG. 5B is a block diagram showing a set of welding line elements of the welding portion; , (C) is a vector diagram showing a welding axis direction, a welding width direction, and a welding depth direction of the first welding line element among the assembled welding line elements, and (d) is a vector diagram showing the first welding line element among the assembled welding line elements. FIG. 4 is a vector diagram showing a welding axis direction, a welding width direction, and a welding depth direction of two welding line elements.
FIG. 6 is a block diagram illustrating the determination of the direction of a welding line element in step 4 shown in FIGS. 1 and 2;
FIG. 7 is a flowchart for explaining the contents of step 5 shown in FIGS. 1 and 2;
FIG. 8 is a view for explaining the contents of step 6 shown in FIGS. 1 and 2;
9A and 9B are diagrams for explaining the contents of step 7 shown in FIGS. 1 and 2, wherein FIG. 9A is a vector diagram showing a welding axis direction, a welding width direction, and a welding depth direction of an element in an element coordinate system; (B) is a vector diagram showing a welding axis direction, a welding width direction, and a welding depth direction of elements to be adjusted to the overall coordinate system of the welding structure.
10A and 10B are diagrams for explaining the contents of step 8 shown in FIGS. 1 and 2, wherein FIG. 10A is a diagram showing an entire coordinate system taking a steam turbine nozzle diaphragm as an example, and FIG. The figure which shows the local coordinate system of the plate-shaped division | segmentation element taken out from mesh division.

Claims (7)

  1. A welding work condition setting step for designating the position of the weld line and the direction of the weld line based on the mesh division of the finite element model of the welded structure, while setting the type of welding of the weld line and the heat input condition of the welding temperature. Dividing the set welding line into welding line elements composed of element units of the FEM model; determining the directions of the divided welding line elements; and forming the finite element model of the welding structure and the welding line. Calculating the distance and the direction to the element, and calculating the intrinsic strain distribution determined according to the type of welding, the heat input, and the distance from the welding line for each of the elements constituting the finite element model; Converting the inherent strain of each element into at least one of a coordinate system of the entire coordinate system of the welded structure and a local coordinate system of the element; The method of analysis welded structure characterized by having a step of creating a FEM analysis data given as loading conditions inherent strain into individual elements.
  2. The method for analyzing a welded structure according to claim 1, wherein the position of the weld line and the direction of the weld line are designated by designating an element obtained by dividing a model of the welded structure into meshes.
  3. The method for analyzing a welded structure according to claim 1, wherein the designation of the position of the weld line and the direction of the weld line are performed by designating a node in an element obtained by dividing the model of the welded structure into meshes.
  4. 2. The method according to claim 1, wherein the designation of the position of the welding line and the direction of the welding line is performed by designating a combination of an element obtained by dividing the model of the welded structure into meshes and nodes within the element. Analysis method for welded structures.
  5. The position of the welding line and the direction of the welding line can be specified using at least one of a pen pointer, a mouse, and a number key on the model of the welded structure shown on the CRT screen, and at least elements, nodes, straight lines, curves, and arcs. The method for analyzing a welded structure according to claim 1, wherein the method is performed by designating at least one of the following.
  6. The welding operation condition step is to select at least one of an element, a node, and a combination of the mesh type by selecting the type of welding and the heat input condition of the welding temperature from the intrinsic strain database and meshing the model of the welded structure. The method for analyzing a welded structure according to claim 1, wherein:
  7. Welding conditions, specifying the position of the welding line and the direction of the welding line based on the mesh division of the finite element model of the welded structure, while specifying the type of welding of the welding line and the heat input conditions of the welding temperature Means for setting, means for dividing the set welding line into welding line elements composed of the element units of the FEM model, and an element for determining a direction of the divided welding line element and constituting a finite element model of the welding structure. While calculating the distance and direction with the welding line element, for each element constituting the finite element model of the welded structure, the intrinsic strain distribution determined according to the type of welding and the heat input and the distance from the welding line. Means for calculating, a means for converting the calculated intrinsic strain of each element into at least one of the coordinate system of the entire welded structure and the local coordinate system of the element, Analyzer of welded structures, characterized in that it comprises means for creating a FEM analysis data given as loading conditions of the strain to the individual elements.
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