CN110598357A - Welding joint stress deformation simulation method, device, equipment and storage medium - Google Patents
Welding joint stress deformation simulation method, device, equipment and storage medium Download PDFInfo
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- CN110598357A CN110598357A CN201910913820.2A CN201910913820A CN110598357A CN 110598357 A CN110598357 A CN 110598357A CN 201910913820 A CN201910913820 A CN 201910913820A CN 110598357 A CN110598357 A CN 110598357A
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Abstract
The embodiment of the invention provides a method, a device, equipment and a storage medium for simulating stress deformation of a welding joint, wherein the method comprises the following steps: acquiring a finite element model of the welding joint; based on the finite element model, solving a temperature field according to preset welding process parameters, heat exchange boundary conditions and control parameters to obtain temperature field distribution; acquiring mechanical curves of the material under different constraint boundary conditions, matching the mechanical curves based on the finite element model and the temperature field distribution, and acquiring a constitutive model corresponding to the mechanical curves obtained through matching; and solving a mechanical field based on the constitutive model to obtain the stress deformation distribution of the welding joint. According to the method, the mechanical curve interface matched with the engineering practice is established, the material parameters of the constitutive model can be defined rapidly and accurately, and the adaptability and the flexibility of the constitutive model in the simulation process are improved.
Description
Technical Field
The invention relates to the technical field of welding numerical simulation, in particular to a method, a device, equipment and a storage medium for simulating stress deformation of a welding joint.
Background
Welding residual stress, welding residual plastic strain, and welding residual deformation can have a detrimental effect on the service life of the welded structure. As is known, tensile welding residual stress accelerates crack initiation and growth, welding residual plastic strain is a representative measure of microscopic defects inside a structure, and welding residual deformation affects subsequent processing and assembly of the structure, and then affects service performance and service life of the structure. These aspects all show that obtaining the high-precision and high-reliability stress deformation result in the welded joint has very important significance.
With the rapid development of the CAE welding simulation technology, the stress deformation simulation of the welding joint gradually becomes an important link in engineering production such as welding process formulation, welding process evaluation, welding structure integrity evaluation and the like, and a full-field result of the stress deformation of the welding joint can be obtained more efficiently and more comprehensively than an experimental means, so that the cost is greatly reduced, and the efficiency is improved.
The constitutive model is the most important part in the stress deformation simulation method of the welding joint, and directly determines the calculation results of stress, strain and deformation. However, the existing welding joint stress deformation simulation method has a fixed flow and a fixed constitutive model, requires manual input of parameters of materials under various conditions, can only judge which constitutive model is adopted through knowledge of engineers, does not have the capability of realizing a complex model, and can only be based on very simplified assumptions. The methods cannot meet the complex simulation requirements in the engineering production practice in the aspects of diversity, flexibility and convenience of constitutive models.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide a method, an apparatus, a device and a storage medium for simulating stress deformation of a welded joint, so as to solve the problem in the prior art that a constitutive model is poor in matching diversity, flexibility and convenience.
The preferred embodiment of the invention provides a method for simulating stress deformation of a welding joint, which comprises the following steps:
acquiring a finite element model of the welding joint;
based on the finite element model, solving a temperature field according to preset welding process parameters, heat exchange boundary conditions and control parameters to obtain temperature field distribution; wherein the boundary condition comprises a mechanical boundary condition;
acquiring mechanical curves of the material under different constraint boundary conditions, matching the finite element model with the temperature field distribution based on the temperature field data, and acquiring constitutive model adaptation corresponding to the mechanical curves, wherein the constitutive model adaptation is acquired through matching;
and solving a mechanical field based on the constitutive model to obtain the stress deformation distribution of the welding joint.
Preferably, the obtaining a finite element model of the welding joint specifically includes:
obtaining a CAD model of a welding joint;
acquiring a basic area and a welding bead area; the basic region is generated after being cut by the CAD model and comprises a welding seam region, a welding heat influence region and a base material region, and the welding bead region is generated after being cut by the welding seam region;
and meshing based on the basic area and the welding bead area to obtain a finite element model.
Preferably, the weld seam region is a region which has undergone at least one melting and solidifying physical process; the welding heat affected zone is a zone with a material structure or performance changed under the influence of heating; the parent material area is an area with unchanged material structure or performance; the welding bead area is a single-pass area formed in a certain melting and solidifying process in the welding seam area.
Preferably, the boundary condition heat exchange boundary condition further comprises at least one of:
convective heat transfer boundary conditions and radiative heat transfer boundary conditions.
Preferably, the mechanical curve is derived from:
mechanical loading tests of standard patterns, thermal simulation tests of standard patterns, performance software simulations or literature references.
Preferably, the obtaining of the mechanical curves of the material under different constraint boundary conditions, matching of the mechanical curves based on the finite element model and the temperature field distribution, and obtaining of the constitutive model corresponding to the mechanical curves obtained by matching, to obtain the mechanical curves of the material under different conditions, so as to perform constitutive model adaptation based on the temperature field data and the mechanical curves specifically include:
acquiring temperature field data distribution;
acquiring model basic regions generated by dividing the finite element model based on the temperature field data distribution and temperature intervals of the model regions;
and matching the mechanical curves of the basic model area and the temperature interval to obtain an adapted constitutive model based on the mechanical curves.
Preferably, after solving a mechanical field based on the constitutive model to obtain a stress deformation distribution of the weld joint, the method further includes:
and carrying out visual processing on the data of the temperature field and/or the mechanical field.
The embodiment of the invention also provides a welding joint stress deformation simulation device, which comprises:
a finite element model obtaining unit for obtaining a finite element model of the welding joint;
the temperature field distribution acquisition unit is used for solving a temperature field according to preset welding process parameters, heat exchange boundary conditions and control parameters based on the finite element model so as to acquire temperature field distribution; wherein the boundary condition comprises a mechanical boundary condition;
the constitutive model adapting unit is used for acquiring mechanical curves of the material under different constraint boundary conditions, matching the mechanical curves based on the finite element model and the temperature field distribution, acquiring the constitutive model corresponding to the mechanical curves obtained by matching, acquiring the mechanical curves of the material under different conditions, and adapting the constitutive model based on the temperature field data and the mechanical curves;
and the stress deformation distribution acquisition unit is used for solving a mechanical field based on the constitutive model so as to acquire the stress deformation distribution of the welding joint.
The embodiment of the invention also provides a welding joint stress deformation simulation device which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor realizes the welding joint stress deformation simulation method when executing the program.
The invention also provides a computer readable storage medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements a weld joint stress deformation simulation method as described above.
The welding joint stress deformation simulation method provided by the invention combines a mechanical curve, can quickly and accurately define the material parameters of the constitutive model by establishing a mechanical curve interface matched with the actual engineering, realizes instant screening, modification and deletion according to the requirements of engineers, solves the problems of repeated conversion and lack of flexibility of the material parameters of the constitutive model in the actual engineering simulation, and provides a scheme for seamless joint with the mechanical property test and the simulation research of the material.
According to the invention, the physical process can be reproduced according to the actual requirements of engineers according to the preset welding process parameters, and the stress deformation full-field result under different materials, different welding processes, working conditions and physical assumptions is simulated, so that the simulation data can be accumulated, further theoretical research can be carried out, and the engineering application of a new constitutive model can be promoted.
The invention carries out visual analysis on the temperature field, the displacement field, the strain field and the stress field obtained by calculation by carrying out visual processing on the simulation data obtained in the simulation process, is beneficial to researching and judging the quality of the simulation result, extracting various indexes such as the maximum deformation, carrying out the analysis of problems such as process optimization and the like
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic flow chart of a method for simulating stress deformation of a weld joint according to a first embodiment of the present invention.
FIG. 2 is a schematic view of a finite element model of a weld joint according to a first embodiment of the present invention.
Fig. 3 is a cloud view of the transient temperature field distribution of the flat butt joint according to the first embodiment of the present invention.
FIG. 4 is a schematic diagram of the constraint boundary conditions of the flat plate weld joint according to the first embodiment of the present invention;
FIGS. 5-6 are schematic mechanical curves of the first embodiment of the present invention;
FIG. 7 is a schematic view of a constitutive model in the first embodiment of the present invention;
fig. 8 is a cloud diagram of the transient equivalent stress field of the flat plate butt joint according to the first embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a welding joint stress deformation simulation apparatus according to a second embodiment of the present invention.
Icon: 201-finite element model obtaining unit; 202-a temperature field distribution acquisition unit; 203-constitutive model adaptation unit; 204-a stress-deformation-distribution obtaining unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
In the embodiments, the references to "first \ second" are merely to distinguish similar objects and do not represent a specific ordering for the objects, and it is to be understood that "first \ second" may be interchanged with a specific order or sequence, where permitted. It should be understood that "first \ second" distinct objects may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced in sequences other than those illustrated or described herein.
As shown in fig. 1, a first embodiment of the present invention provides a welding joint stress-deformation simulation method, which can be executed by a welding joint stress-deformation simulation device, and in particular, can be executed by one or more processors in the device, and includes the following steps:
s101, obtaining a finite element model of the welding joint.
In this embodiment, the finite element model may be established by a solid modeling method: firstly, according to the measured size of the welding joint, a solid geometric model of the welding joint is established by using three-dimensional drawing software. Then, an appropriate mesh density is determined according to the simulation accuracy requirement, the computational efficiency and the size of the solid model, particularly the size of the minimum profile, and the solid geometric model is subjected to meshing by using meshing software, as shown in fig. 2.
And S102, solving the temperature field according to preset welding process parameters, heat exchange boundary conditions and control parameters based on the finite element model so as to obtain the distribution of the temperature field.
In this embodiment, the welding process parameters include: welding speed, welding power, heat source type, heat source parameters, welding path, welding gun direction, welding sequence, etc. Wherein, the heat source model chooses for use and welds the comparatively close two ellipsoid models of actual conditions, then the heat source parameter includes: heat source radius, height, front radius, back radius, front coefficient, back coefficient, and the like. The welding process parameters are preset, the physical process can be reproduced according to the actual requirements of engineers, simulation results under different materials, different welding conditions and different physical assumptions can be simulated, and subsequent deep theoretical research is facilitated.
Wherein, in the welding process, there is a heat exchange loss, so a heat exchange boundary condition needs to be set. The heat exchange boundary conditions include at least one of: convective heat transfer boundary conditions, radiative heat transfer boundary conditions. In the practical process, the boundary conditions of radiation heat exchange and convection heat exchange can be uniformly simplified into equivalent convection heat exchange coefficients.
The control parameters are used for solving discretization temperature, and include preheating temperature, environment temperature, welding calculation time step length, cooling time, iteration maximum temperature difference and the like. The temperature field distribution can be obtained by temperature field calculation.
S103, obtaining mechanical curves of the material under different constraint boundary conditions, matching the mechanical curves based on the finite element model and the temperature field distribution, and obtaining a constitutive model corresponding to the mechanical curves obtained through matching.
The constraint boundary conditions include external force acting conditions, contact boundary conditions, fixed boundary conditions, and the like, and in this embodiment, only the fixed boundary conditions need to be set.
In this embodiment, the mechanical curve sources are: the invention is not limited in particular by the mechanical loading test of the standard pattern, the thermal simulation test of the standard pattern, the performance software simulation or the literature reference.
In a specific embodiment, a mechanical curve of the material is obtained by adopting performance software JMatPro simulation. Specifically, the material, the component and the parameter of the welding joint material are set and input into performance software JMatPro, the result is processed into a document or a picture in an informationization mode after calculation, and then the document or the picture is imported into simulation software Inteweld to complete initialization of the material parameters.
In this embodiment, the step 103 specifically includes the following steps:
s1031, obtaining temperature field distribution;
s1032, acquiring model areas generated by dividing the finite element model based on the temperature field distribution and temperature intervals of the model areas;
and S1033, matching the mechanical curves of the model area and the temperature interval to obtain an adaptive constitutive model based on the mechanical curves.
In this embodiment, the model region is divided based on the temperature field, and includes a weld seam region, a welding heat affected region and a parent metal region, and the division precision of the model region and the division value of the temperature interval may adopt a system default value or may be set by a user, which is not specifically limited in the present invention.
The mechanical curve shapes of different model areas and different temperature intervals are different, the constitutive model is a mechanical constitutive equation of the material, and the mechanical curve is an important parameter of the constitutive model. Therefore, the shape of the mechanical curve can be matched with the constitutive model, so that the flexibility and convenience of parameter conversion in the simulation process are improved, and the complex simulation requirements can be met.
And S104, solving a mechanical field based on the constitutive model to obtain the stress deformation distribution of the welding joint.
In this embodiment, discretization solution is performed on the constitutive model to obtain stress field deformation distribution.
In conclusion, the welding joint stress deformation simulation method provided by the invention combines a mechanical curve, can quickly and accurately define the material parameters of the constitutive model by establishing a mechanical curve interface matched with the actual engineering, realizes instant screening, modification and deletion according to the requirements of engineers, solves the problems of repeated conversion and lack of flexibility of the material parameters of the constitutive model in the actual engineering simulation, and provides a scheme for seamless joint with the mechanical property test and the simulation research of the material. According to preset welding process parameters, a physical process can be reproduced according to the actual requirements of engineers, stress deformation full-field results under different materials, different welding processes, different working conditions and different physical assumptions are simulated, and the simulation data can be accumulated, so that more deep theoretical research is carried out, and the engineering application of a new constitutive model is promoted.
On the basis of the foregoing embodiment, in a preferred embodiment, the step S101 specifically includes:
s1011, obtaining a CAD model of the welding joint;
s1012, acquiring a basic area and a welding bead area; the basic region is generated after being cut by the CAD model and comprises a welding seam region, a welding heat influence region and a base material region, and the welding bead region is generated after being cut by the welding seam region;
and S1013, performing meshing based on the basic region and the welding bead region to obtain a finite element model.
Wherein the weld joint region is a region which has undergone at least one melting and solidifying physical process; the welding heat affected zone is a zone with a material structure or performance changed under the influence of heating; the parent material area is an area with unchanged material structure or performance; the welding bead area is a single-pass area formed in a certain melting and solidifying process in the welding seam area.
When the grids are divided, the unit types and the unit sizes of all the basic regions need to be determined in advance, in the embodiment, the grids are tetrahedrons, the grids are divided by adopting smaller sizes at the positions close to welding lines, the grids are divided by adopting larger sizes at the positions far away from the welding lines, the density of the grids is uniformly transited, and the grid sizes are 0.5-5 mm. When the grid size is too dense, the calculation amount is increased, and the efficiency is reduced; and when the grid size is too sparse, the accuracy of the calculation result is reduced.
Of course, in this embodiment, other three-dimensional drawing software may also be used to establish the solid geometric model, such as Pro/E, UG, etc., and the present invention is not limited in particular.
On the basis of the foregoing embodiment, in a preferred embodiment, after performing a mechanical field solution based on the constitutive model to obtain a stress deformation distribution of the weld joint, the method further includes:
and carrying out visual processing on the data of the temperature field and/or the mechanical field.
In this embodiment, after the calculation of the temperature field and the stress field is completed, the simulation data obtained in the simulation process may be visualized by using welding simulation software, such as Inteweld, or an open source visualization program, such as Paraview. Specifically, a corresponding physical field solver can be compiled by adopting a C + + language, a visual interface development is carried out by adopting VTK and QT platforms, then the visual analysis is carried out on the temperature field, the displacement field, the strain field and the stress field obtained by calculation, the quality of a simulation result is researched and judged, various indexes such as the maximum deformation are extracted, and the analysis of problems such as process optimization is carried out.
For ease of understanding, the plate butt joint will be specifically described below as an example.
The welding simulation software used intewedd. In step S101, a geometric model of the plate butt joint is first created using UG software, wherein the plate has a size of 50mm × 40mm × 4 mm. And then cutting the geometric model to obtain a welding seam area, a welding heat influence area, a base material area and other basic areas, and cutting the welding seam area to obtain a welding bead area. And adopting mesh division software hypermesh to carry out mesh division, wherein the minimum mesh size is 0.5mm, the maximum mesh size is 5mm, and the density meshes of the welding line area and the parent metal area are uniformly transited.
In step S102, a welding speed is set to 10mm/S, a welding power is set to 1500w, a double-ellipsoid heat source model is selected as a mathematical expression of welding heat input, parameters of the double-ellipsoid heat source model are set to be 3mm in radius, 5mm in height, 1mm in front radius and 4mm in rear radius, and a front coefficient and a rear coefficient are both 1. And (4) picking up the welding seam starting point and the welding seam end point, and automatically judging the direction of the welding gun by software. All surfaces were selected and the equivalent convective heat transfer coefficient was set to 0.15J/m 2. s.cndot.. Setting solving control parameters: the method comprises the steps of environment temperature 25 ℃, preheating temperature 25 ℃, welding calculation time step length 0.1s, cooling time 3600s, and performing temperature field calculation after iteration step maximum temperature difference is 500 ℃, so as to obtain a temperature field distribution cloud chart as shown in figure 3.
In step 103, a mechanical curve is calculated and obtained by using material performance calculation software JMatPro, wherein the welding joint material is 304 stainless steel, the fixed boundary conditions are set as shown in FIG. 4, and the temperature setting values are 25 ℃, 200 ℃, 400 ℃, 800 ℃, 1000 ℃ and 1200 ℃, so as to obtain a stress-strain curve as shown in FIGS. 5-6. And (3) exporting the mechanical curve, selecting a file suffix in a format of ". dat" or ". txt", and then importing the file suffix into Inteweld software to complete initialization of material parameters. Setting the division mode of the plate joint space region as 'automatic', selecting the division complexity as 'simple', and finishing the division of the model region. Then setting a temperature division mode as 'self-definition', and inputting a series of temperature values for dividing a temperature interval: 25. 200, 400, 800, 1000, 1200 ℃. Finally, the constitutive model adaptation mode is set as "automatic", the adaptation complexity is selected as "simple", and the constitutive models of all temperature intervals of all the regions are adapted to the isotropic hardening model under the Mises yield condition, as shown in fig. 7. In step S104, all the above settings are saved, and a mechanical field calculation is performed, so that a stress field cloud graph is obtained as shown in fig. 8.
In the welding joint stress deformation simulation method based on self-definition of the constitutive model, Inteweld welding simulation software is adopted to complete processes of finite element model establishment, process and simulation parameter setting and the like. The mechanical curve is imported through a software interface, the self-definition of the constitutive model is completed, and the stress deformation field result of the welding joint is finally obtained through calculation, so that actual engineering personnel can realize the simulation calculation of the welding joint under different requirements by using a computer and welding simulation software, and references are provided for structural design improvement and technological parameter optimization.
Referring to fig. 9, a second embodiment of the present invention provides a welding joint stress deformation simulation apparatus, including:
a finite element model obtaining unit 201, configured to obtain a finite element model of the welded joint;
a temperature field distribution obtaining unit 202, configured to solve a temperature field according to preset welding process parameters, heat exchange boundary conditions, and control parameters based on the finite element model to obtain temperature field distribution;
the constitutive model adapting unit 203 is used for acquiring mechanical curves of the material under different constraint boundary conditions, matching the mechanical curves based on the finite element model and the temperature field distribution, and acquiring a constitutive model corresponding to the mechanical curves obtained by matching;
a stress deformation distribution obtaining unit 204, configured to perform a mechanical field solution based on the constitutive model to obtain a stress deformation distribution of the weld joint.
Preferably, the finite element model obtaining unit 201 specifically includes:
the CAD model acquisition module is used for acquiring a CAD model of the welding joint;
the area acquisition module is used for acquiring a basic area and a welding bead area; the basic region is generated after being cut by the CAD model and comprises a welding seam region, a welding heat influence region and a base material region, and the welding bead region is generated after being cut by the welding seam region;
and the model acquisition module is used for carrying out meshing on the basis of the basic region and the welding bead region so as to acquire a finite element model.
Preferably, the weld seam area is an area which has undergone at least one melting and solidifying physical process; the welding heat affected zone is a zone with a material structure or performance changed under the influence of heating; the parent material area is an area with unchanged material structure or performance; the welding bead area is a single-pass area formed in a certain melting and solidifying process in the welding seam area.
Preferably, the heat exchange boundary conditions include at least one of:
convective heat transfer boundary conditions, radiative heat transfer boundary conditions.
Preferably, the mechanical curve is derived from:
mechanical loading tests of standard patterns, thermal simulation tests of standard patterns, performance software simulations or literature references.
Preferably, the constitutive model adapting unit 203 specifically includes:
the temperature field distribution acquisition module is used for acquiring temperature field distribution;
the region acquisition module is used for acquiring model regions generated by dividing the finite element model based on the temperature field distribution and temperature intervals of the model regions;
and the matching module is used for matching the mechanical curves of the model area and the temperature interval so as to obtain the adaptive constitutive model based on the mechanical curves.
Preferably, the welding joint stress deformation simulation device further includes:
and the visualization processing unit is used for performing visualization processing on the temperature field and/or the mechanical field.
The third embodiment of the invention provides a welding joint stress deformation simulation device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the welding joint stress deformation simulation method.
A fourth embodiment of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the weld joint stress deformation simulation method as described above.
Illustratively, the computer programs described herein can be partitioned into one or more modules that are stored in the memory and executed by the processor to implement the invention. The one or more modules may be a series of computer program instruction segments capable of performing certain functions, which are used to describe the execution of the computer program in the implementation device. For example, the device described in the second embodiment of the present invention.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an APPlication Specific Integrated Circuit (ASIC), a Field-Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being the control center of the printing method, and various interfaces and lines connecting the various parts throughout the implementation of the document printing method.
The memory may be used to store the computer programs and/or modules, and the processor may implement various functions of the printing method by executing or executing the computer programs and/or modules stored in the memory and calling data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, a text conversion function, etc.), and the like; the storage data area may store data (such as audio data, text message data, etc.) created according to the use of the user terminal, etc. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the module for realizing the user terminal can be stored in a computer readable storage medium if it is realized in the form of software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A stress deformation simulation method for a welding joint is characterized by comprising the following steps:
acquiring a finite element model of the welding joint;
based on the finite element model, solving a temperature field according to preset welding process parameters, heat exchange boundary conditions and control parameters to obtain temperature field distribution;
acquiring mechanical curves of the material under different constraint boundary conditions, matching the mechanical curves based on the finite element model and the temperature field distribution, and acquiring a constitutive model corresponding to the mechanical curves obtained through matching;
and solving a mechanical field based on the constitutive model to obtain the stress deformation distribution of the welding joint.
2. The method for simulating stress deformation of a welding joint according to claim 1, wherein the obtaining a finite element model of the welding joint specifically comprises:
obtaining a CAD model of a welding joint;
acquiring a basic area and a welding bead area; the basic region is generated after being cut by the CAD model and comprises a welding seam region, a welding heat influence region and a base material region, and the welding bead region is generated after being cut by the welding seam region;
and meshing based on the basic area and the welding bead area to obtain a finite element model.
3. The weld joint stress-deformation simulation method according to claim 2, wherein the weld region is a region that has undergone at least one melting-solidification physical process; the welding heat affected zone is a zone with a material structure or performance changed under the influence of heating; the parent material area is an area with unchanged material structure or performance; the welding bead area is a single-pass area formed in a certain melting and solidifying process in the welding seam area.
4. The weld joint stress-deformation simulation method of claim 1, wherein the heat exchange boundary conditions include at least one of:
convective heat transfer boundary conditions, radiative heat transfer boundary conditions.
5. The weld joint stress-deformation simulation method according to claim 1, wherein the mechanical curve sources are:
mechanical loading tests of standard patterns, thermal simulation tests of standard patterns, performance software simulations or literature references.
6. The method for simulating stress deformation of a welding joint according to claim 1, wherein the obtaining of mechanical curves of materials under different constraint boundary conditions, matching of the mechanical curves based on the finite element model and the temperature field distribution, and obtaining of a constitutive model corresponding to the mechanical curves obtained by matching specifically include:
acquiring temperature field distribution;
obtaining model regions generated by dividing the finite element model based on the temperature field distribution and temperature intervals of the model regions;
and matching the mechanical curves of the model area and the temperature interval to obtain an adapted constitutive model based on the mechanical curves.
7. The method for simulating stress deformation of a welding joint according to claim 1, wherein after performing mechanical field solution based on the constitutive model to obtain the stress deformation distribution of the welding joint, the method further comprises:
and carrying out visual processing on the data of the temperature field and/or the mechanical field.
8. A welded joint stress deformation simulation device is characterized by comprising:
a finite element model obtaining unit for obtaining a finite element model of the welding joint;
the temperature field distribution acquisition unit is used for solving a temperature field according to preset welding process parameters, heat exchange boundary conditions and control parameters based on the finite element model so as to acquire temperature field distribution; the constitutive model adapting unit is used for acquiring mechanical curves of the materials under different constraint boundary conditions, matching the mechanical curves based on the finite element model and the temperature field distribution, and acquiring a constitutive model corresponding to the mechanical curves obtained by matching;
and the stress deformation distribution acquisition unit is used for solving a mechanical field based on the constitutive model so as to acquire the stress deformation distribution of the welding joint.
9. A weld joint stress-deformation simulation device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the weld joint stress-deformation simulation method of any one of claims 1 to 7 when executing the program.
10. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the method for simulating a stress-deformation of a weld joint according to any one of claims 1 to 7.
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