CN110598357A - A method, device, equipment and storage medium for stress deformation simulation of welded joints - Google Patents

Abstract

Embodiments of the present invention provide a method, device, equipment, and storage medium for stress deformation simulation of welded joints. The method includes: obtaining a finite element model of the welded joint; The boundary conditions and control parameters are used to solve the temperature field to obtain the temperature field distribution; obtain the mechanical curve of the material under different constraint boundary conditions, and perform matching of the mechanical curve based on the finite element model and the temperature field distribution, and obtain and match to obtain A constitutive model corresponding to the mechanical curve of the above-mentioned constitutive model; performing a mechanical field solution based on the constitutive model to obtain the stress and deformation distribution of the welded joint. The invention can quickly and accurately define the material parameters of the constitutive model by establishing the mechanical curve interface matched with the actual engineering, and improves the diversity and flexibility of constitutive model adaptation in the simulation process.

Description

A method, device, equipment and storage medium for stress deformation simulation of welded joints

technical field

The invention relates to the technical field of welding numerical simulation, in particular to a stress deformation simulation method, device, equipment and storage medium of a welded joint.

Background technique

Welding residual stress, welding residual plastic strain and welding residual deformation will have harmful effects on the service and service life of welded structures. It is well known that tensile welding residual stress can accelerate crack initiation and growth, welding residual plastic strain is a representative measure of microscopic defects inside the structure, and welding residual deformation affects the subsequent processing and assembly of the structure, which in turn affects the service performance and service life of the structure. These aspects all show that it is of great significance to obtain high-precision and high-reliability stress-deformation results in welded joints.

With the rapid development of welding CAE simulation technology, the stress and deformation simulation of welded joints has gradually become an important link in engineering production such as welding process formulation, welding process evaluation, and welding structural integrity evaluation. It can obtain welding results more efficiently and comprehensively than experimental methods. The full-field results of joint stress and deformation greatly reduce costs and improve efficiency.

The constitutive model is the most important part in the stress-deformation simulation method of welded joints, which directly determines the calculation results of stress, strain and deformation. However, the existing stress-deformation simulation methods for welded joints have a fixed process and a fixed constitutive model, which requires manual input of material parameters in various situations, which can only be judged by the knowledge of engineers, and does not have The ability to implement complex models can only be based on very simplified assumptions. These methods cannot meet the complex simulation requirements in actual engineering production in terms of the diversity, flexibility and convenience of constitutive models.

Contents of the invention

In view of this, the purpose of the embodiments of the present invention is to provide a stress deformation simulation method, device, equipment and storage medium for welded joints, so as to improve the problems of poor matching diversity, flexibility and convenience of constitutive models in the prior art.

A preferred embodiment of the present invention provides a method for simulating stress and deformation of a welded joint, comprising:

Obtain the finite element model of the welded joint;

Based on the finite element model, the temperature field is solved according to the preset welding process parameters, heat transfer boundary conditions and control parameters to obtain the temperature field distribution; wherein the boundary conditions include mechanical boundary conditions;

Obtaining mechanical curves of materials under different constraint boundary conditions, matching the mechanical curves based on the finite element model of the temperature field data and the temperature field distribution, and obtaining the corresponding mechanical curves obtained from the matching Structural model adaptation;

A mechanical field solution is performed based on the constitutive model to obtain the stress and deformation distribution of the welded joint.

Preferably, said obtaining the finite element model of the welded joint specifically includes:

Obtain the CAD model of the welded joint;

Obtain the basic area and the weld bead area; wherein, the basic area is generated after being cut by the CAD model, including the weld seam area, the welding heat-affected zone and the base metal area, and the weld bead area is cut by the weld seam area generate;

Mesh division is performed based on the basic area and the weld bead area to obtain a finite element model.

Preferably, the weld area is an area that has undergone at least one physical process of melting and solidification; the welding heat-affected zone is an area where the material structure or performance changes due to heating; the base metal area is a material structure or performance that is always There is no area that changes; the weld bead area is a single-pass area formed by a certain melting and solidification process in the weld area.

Preferably, the boundary condition heat exchange boundary condition further includes at least one of the following:

Convective heat transfer boundary conditions and radiation heat transfer boundary conditions.

Preferably, the source of the mechanical curve is:

Standard style mechanical loading test, standard style thermal simulation test, performance software simulation or literature review.

Preferably, the acquisition of the mechanical curves of the material under different constraint boundary conditions, the matching of the mechanical curves based on the finite element model and the temperature field distribution, and the acquisition of the constitutive model corresponding to the matched mechanical curves Obtaining mechanical curves of materials under different conditions to perform constitutive model adaptation based on the temperature field data and the mechanical curves, specifically including:

Obtain the temperature field data distribution;

Obtaining the basic area of the model generated by dividing the finite element model based on the temperature field data distribution and the temperature range of each model area;

and matching the mechanical curves of the basic model region and the temperature range, so as to obtain a matched constitutive model based on the mechanical curves.

Preferably, after solving the mechanical field based on the constitutive model to obtain the stress and deformation distribution of the welded joint, it also includes:

Perform visualization processing on the data of the temperature field and/or the mechanical field.

The embodiment of the present invention also provides a stress deformation simulation device for welded joints, including:

A finite element model acquisition unit is used to obtain a finite element model of the welded joint;

The temperature field distribution acquisition unit is used to solve the temperature field according to the preset welding process parameters, heat transfer boundary conditions and control parameters based on the finite element model, so as to obtain the temperature field distribution; wherein the boundary conditions include mechanical boundaries condition;

The constitutive model adaptation unit is used to obtain the mechanical curve of the material under different constraint boundary conditions, perform matching of the mechanical curve based on the finite element model and the temperature field distribution, and obtain the corresponding mechanical curve obtained by matching The constitutive model obtains the mechanical curve of the material under different conditions, and performs constitutive model adaptation based on the temperature field data and the mechanical curve;

The stress and deformation distribution obtaining unit is configured to solve the mechanical field based on the constitutive model, so as to obtain the stress and deformation distribution of the welded joint.

The embodiment of the present invention also provides a welded joint stress and deformation simulation device, including a memory, a processor, and a computer program stored on the memory and operable on the processor. When the processor executes the program, the above-mentioned Simulation method of stress and deformation of welded joints.

The present invention also provides a computer-readable storage medium, on which a computer program is stored, which is characterized in that, when the program is executed by a processor, the method for simulating stress and deformation of a welded joint as described above is realized.

The stress-deformation simulation method of welded joints provided by the present invention is combined with mechanical curves. By establishing a mechanical curve interface that matches the actual engineering, the material parameters of the constitutive model can be quickly and accurately defined, and real-time screening, modification and deletion can be realized according to the needs of engineers. , which solves the problem of multiple conversions of constitutive model material parameters and lack of flexibility in engineering simulation, and provides a seamless connection with material mechanical performance testing and simulation research.

According to the preset welding process parameters, the present invention can reproduce the physical process according to the actual needs of engineers, simulate the full-field results of stress and deformation under different materials, different welding processes, working conditions, and physical assumptions, and help to accumulate simulation data, thereby Carry out more in-depth theoretical research and promote the engineering application of new constitutive models.

The present invention visualizes and analyzes the calculated temperature field, displacement field, strain field and stress field by visualizing the simulated data obtained in the simulation process, which is beneficial to research and judge the quality of the simulation results, and extracts various indicators such as Maximum deformation, process optimization and other issues analysis

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

FIG. 1 is a schematic flowchart of a method for simulating stress and deformation of a welded joint according to the first embodiment of the present invention.

Fig. 2 is a schematic diagram of a finite element model of a welded joint in the first embodiment of the present invention.

Fig. 3 is a cloud diagram of the transient temperature field distribution of the flat butt joint in the first embodiment of the present invention.

Fig. 4 is a schematic diagram of the constrained boundary conditions of a plate welded joint in the first embodiment of the present invention;

5-6 are schematic diagrams of mechanical curves of the first embodiment of the present invention;

7 is a schematic diagram 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 butt joint according to the first embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a stress-deformation simulation device for a welded joint provided by the second embodiment of the present invention.

Icons: 201 - finite element model acquisition unit; 202 - temperature field distribution acquisition unit; 203 - constitutive model adaptation unit; 204 - stress deformation distribution acquisition unit.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In order to better understand the technical solutions of the present invention, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a", "said" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

It should be understood that the term "and/or" used herein is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B, which may mean that A exists alone, and A and B exist simultaneously. B, there are three situations of B alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

Depending on the context, the word "if" as used herein may be interpreted as "at" or "when" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrases "if determined" or "if detected (the stated condition or event)" could be interpreted as "when determined" or "in response to the determination" or "when detected (the stated condition or event) )" or "in response to detection of (a stated condition or event)".

The "first\second" mentioned in the embodiment is only to distinguish similar objects, and does not represent a specific ordering of objects. It is understandable that "first\second" can be interchanged with specific sequence or sequence. It should be understood that the terms "first\second" are interchangeable under appropriate circumstances such that the embodiments described herein can be practiced in sequences other than those illustrated or described herein.

As shown in Figure 1, the first embodiment of the present invention provides a method for simulating stress and deformation of welded joints, which can be executed by a stress and deformation simulation device for welded joints, specifically, it can be executed by one or more processors in the device, Include the following steps:

S101, acquiring a finite element model of a welded joint.

In this embodiment, the establishment of the finite element model can adopt the method of solid modeling: firstly, according to the measured dimensions of the welded joint, a solid geometric model of the welded joint is established by using 3D drawing software. Then, according to the simulation accuracy requirements, calculation efficiency and the size of the solid model, especially the size of the smallest surface, the appropriate mesh density is determined, and the solid geometric model is meshed by using meshing software, as shown in Figure 2.

S102, based on the finite element model, solve the temperature field according to the preset welding process parameters, heat transfer boundary conditions and control parameters, so as to obtain the temperature field distribution.

In this embodiment, the welding process parameters include: welding speed, welding power, heat source type, heat source parameters, welding path, welding torch direction, welding sequence and the like. Wherein, the heat source model is a double ellipsoid model that is closer to the actual welding situation, and the heat source parameters include: heat source radius, height, front radius, back radius, front coefficient, back coefficient, etc. Presetting the welding process parameters can reproduce the physical process according to the actual needs of engineers, and simulate the simulation results under different materials, different welding conditions, and different physical assumptions, which is conducive to subsequent in-depth theoretical research.

Among them, in the welding process, there is heat exchange loss, so it is necessary to set the heat exchange boundary conditions. The heat transfer boundary conditions include at least one of the following: convective heat transfer boundary conditions and radiation heat transfer boundary conditions. In the actual process, the boundary conditions of radiation heat transfer and convective heat transfer can be unified and simplified as the equivalent convective heat transfer coefficient.

The control parameters are used for discretized temperature solution, including preheating temperature, ambient temperature, welding calculation time step, cooling time, iteration maximum temperature difference and so on. The temperature field distribution can be obtained by calculating the temperature field.

S103. Obtain mechanical curves of the material under different constraint boundary conditions, perform matching of the mechanical curves based on the finite element model and the temperature field distribution, and acquire a constitutive model corresponding to the matched mechanical curves.

Wherein, the constraint boundary conditions include external force action conditions, contact boundary conditions, fixed boundary conditions, etc. In this embodiment, only fixed boundary conditions need to be set.

In this embodiment, the source of the mechanical curve is: a mechanical loading test of a standard model, a thermal simulation test of a standard model, performance software simulation or literature review, which is not specifically limited in the present invention.

In a specific embodiment, the performance software JMatPro is used to simulate and obtain the mechanical curve of the material. Specifically, the material, composition and parameter settings of the welded joint material are input into the performance software JMatPro, and the results are processed into documents or pictures after calculation, and then imported into the simulation software Inteweld to complete the initialization of material parameters.

In this embodiment, the step 103 specifically includes the following steps:

S1031, acquiring temperature field distribution;

S1032. Acquire the model areas generated by dividing the finite element model based on the temperature field distribution and the temperature intervals of each model area;

S1033. Match the mechanical curves of the model region and the temperature range, so as to obtain a matched constitutive model based on the mechanical curves.

In this embodiment, the model area is divided based on the temperature field, including the weld area, the welding heat-affected zone, and the base metal area. The default value can also be customized, which is not specifically limited in the present invention.

Among them, due to the different shapes of the mechanical curves in different model regions and different temperature ranges, the constitutive model is the 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, thereby improving the flexibility and convenience of parameter conversion in the simulation process and meeting complex simulation requirements.

S104. Perform a mechanical field solution based on the constitutive model to obtain the stress and deformation distribution of the welded joint.

In this embodiment, the constitutive model is discretized and solved to obtain the deformation distribution of the stress field.

In summary, the stress-deformation simulation method of welded joints provided by the present invention combines mechanical curves, and by establishing a mechanical curve interface that matches the actual engineering, it can quickly and accurately define the material parameters of the constitutive model, and realize instant screening, The modification and deletion solve the problem of multiple conversions and lack of flexibility of the material parameters of the constitutive model in the actual engineering simulation, and provide a seamless connection with the material mechanical performance test and simulation research. According to the preset welding process parameters, the physical process can be reproduced according to the actual needs of engineers, and the full-field results of stress and deformation under different materials, different welding processes, working conditions, and physical assumptions can be simulated, which is helpful for accumulating simulation data, so as to carry out more In-depth theoretical research promotes the engineering application of new constitutive models.

On the basis of the above embodiments, in a preferred embodiment, the step S101 specifically includes:

S1011, acquiring the CAD model of the welded joint;

S1012, acquire a basic area and a weld bead area; wherein, the basic area is generated after cutting the CAD model, including a weld area, a welding heat-affected zone, and a base metal area, and the weld bead area passes through the weld area Generated after cutting;

S1013. Perform grid division based on the basic area and the weld bead area to obtain a finite element model.

Wherein, the weld area is an area that has undergone at least one physical process of melting and solidification; the welding heat-affected zone is an area where the material structure or performance changes due to heating; the base metal area is a material structure or performance that has never been The area where changes occur; the weld bead area is a single pass area formed by a certain melting and solidification process in the weld area.

When performing mesh division, it is necessary to predetermine the unit type and the unit size of each basic area. In this embodiment, the grid is a tetrahedron, and a smaller size is used for grid division near the weld. A larger size is used for mesh division farther away from the weld, and the mesh density is evenly transitioned, and the mesh size is 0.5-5mm. When the grid size is too dense, the calculation amount will increase and the efficiency will be reduced; while the grid size is too sparse, the accuracy of the calculation results will be reduced.

Of course, in this embodiment, other three-dimensional drawing software can also be used to establish a solid geometric model, such as Pro/E, UG, etc., which are not specifically limited in the present invention.

On the basis of the above embodiments, in a preferred embodiment, after solving the mechanical field based on the constitutive model to obtain the stress and deformation distribution of the welded joint, it also includes:

Perform visualization 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, a welding simulation software such as Inteweld or an open source visualization program such as Paraview can be used to visualize the simulated data obtained during the simulation process. Specifically, the corresponding physical field solver can be written in C++ language, and the visual interface development can be carried out by using VTK and QT platforms, and then the calculated temperature field, displacement field, strain field and stress field can be visualized and analyzed, and the method of judging the simulation results can be studied. Good or bad, extract various indicators such as maximum deformation, and analyze issues such as process optimization.

For ease of understanding, a flat butt joint is taken as an example for specific description below.

The welding simulation software adopts Inteweld. In step S101, firstly, a geometric model of the flat plate butt joint is established using UG software, wherein the size of the flat plate is 50mm*40mm*4mm. Then the geometric model is cut to obtain basic areas such as the weld area, the welding heat affected area, and the base metal area, and the weld area is cut to obtain the weld bead area. The grid division software hypermesh is used for grid division, in which the minimum grid size is 0.5mm, the maximum grid size is 5mm, and the density grid of the weld area and the base metal area is evenly transitioned.

In step S102, the welding speed is set to 10mm/s, the welding power is 1500w, the double ellipsoid heat source model is selected as the mathematical expression of welding heat input, and the parameters of the double ellipsoid heat source model are set to radius 3mm, height 5mm, front radius 1mm, The rear radius is 4mm, and the front and rear coefficients are both 1. Pick up the starting point and end point of the welding seam, and the software automatically judges the direction of the welding torch. Select all surfaces and set the equivalent convective heat transfer coefficient to 0.15J/m2·s·℃. Set the solution control parameters: including the ambient temperature of 25°C, the preheating temperature of 25°C, the welding calculation time step of 0.1s, the cooling time of 3600s, and the temperature field calculation after the maximum temperature difference of the iteration step is 500°C, and the temperature field distribution cloud diagram is obtained as shown in Figure 3 shown.

In step 103, use the material performance calculation software JMatPro to calculate and obtain the mechanical curve, in which 304 stainless steel is selected as the material of the welded joint, and the fixed boundary conditions are set as shown in Figure 4. The temperature settings are 25°C, 200°C, 400°C, and 800°C , 1000°C and 1200°C, the stress-strain curves are obtained, as shown in Figure 5-6. Export the mechanical curve, select the file suffix of ".dat" or ".txt", and then import it into Inteweld software to complete the initialization of material parameters. Set the division mode of the plate joint space area to "automatic", select the division complexity as "simple", and complete the division of the model area. Then set the temperature division mode to "Custom", and input a series of temperature values for dividing the temperature range: 25, 200, 400, 800, 1000, 1200°C. Finally, set the constitutive model adaptation mode to "automatic" and select the adaptation complexity to "simple", then the constitutive models of all temperature ranges in all regions are adapted to the isotropic hardening model under Mises yield conditions , as shown in Figure 7. In step S104, all the above-mentioned settings are saved, and the mechanical field calculation is performed, and the obtained stress field nephogram is shown in FIG. 8 .

In the self-defined stress-deformation simulation method of welded joints based on the constitutive model in this embodiment, the Inteweld welding simulation software is used to complete the process of finite element model establishment, process and simulation parameter setting, etc. Import the mechanical curve through the software interface, complete the customization of the constitutive model, and finally calculate the stress and deformation field results of the welded joint, so that the actual engineers can use the computer and welding simulation software to realize the simulation calculation of the welded joint under different requirements, and improve the structure design. And provide reference for process parameter optimization.

Please refer to Fig. 9, the second embodiment of the present invention provides a stress deformation simulation device for welded joints, including:

A finite element model acquisition unit 201, configured to acquire a finite element model of the welded joint;

The temperature field distribution acquisition unit 202 is used to solve the temperature field according to the preset welding process parameters, heat transfer boundary conditions and control parameters based on the finite element model, so as to obtain the temperature field distribution;

The constitutive model adaptation unit 203 is configured to obtain mechanical curves of materials under different constraint boundary conditions, perform matching of mechanical curves based on the finite element model and the temperature field distribution, and obtain and match the mechanical curves Corresponding constitutive model;

The stress and deformation distribution obtaining unit 204 is configured to perform a mechanical field solution based on the constitutive model, so as to obtain the stress and deformation distribution of the welded joint.

Preferably, the finite element model acquisition unit 201 specifically includes:

CAD model acquisition module, used to obtain the CAD model of the welded joint;

The area acquisition module is used to acquire the basic area and the weld bead area; wherein, the basic area is generated after cutting the CAD model, including the weld seam area, the welding heat-affected zone and the base metal area, and the weld bead area is obtained by the Generated after cutting the above weld area;

A model acquiring module, configured to perform grid division based on the basic area and the weld bead area, so as to acquire a finite element model.

Preferably, the weld area is an area that has undergone at least one physical process of melting and solidification; the welding heat-affected zone is an area where the material structure or performance changes due to heating; the base metal area is a material structure or performance that is always There is no area that changes; the weld bead area is a single-pass area formed by a certain melting and solidification process in the weld area.

Preferably, the heat exchange boundary conditions include at least one of the following:

Convective heat transfer boundary conditions, radiation heat transfer boundary conditions.

Preferably, the source of the mechanical curve is:

Standard style mechanical loading test, standard style thermal simulation test, performance software simulation or literature review.

Preferably, the constitutive model adaptation unit 203 specifically includes:

A temperature field sub-acquisition module, used to obtain the temperature field distribution;

an area acquisition module, configured to acquire the model areas generated by dividing the finite element model based on the temperature field distribution and the temperature intervals of each model area;

A matching module, configured to match the mechanical curves of the model region and the temperature range, so as to obtain a matched constitutive model based on the mechanical curves.

Preferably, the stress-deformation simulation device for welded joints also includes:

A visualization processing unit, configured to perform visualization processing on the temperature field and/or the mechanical field.

The third embodiment of the present invention provides a stress-deformation simulation device for welded joints, including a memory, a processor, and a computer program stored on the memory and operable on the processor. When the processor executes the program, the above-mentioned The stress deformation simulation method of the welded joint described above.

A fourth embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the method for simulating stress and deformation of a welded joint as described above is realized.

Exemplarily, the computer program described in the present invention can be divided into one or more modules, and the one or more modules are stored in the memory and executed by the processor to complete the present invention. The one or more modules may be a series of computer program instruction segments capable of accomplishing specific functions, and the instruction segments are used to describe the execution process of the computer program in the implementing device. For example, the device described in the second embodiment of the invention.

The so-called processor can be a central processing unit (Central Processing Unit, CPU), and can also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application-specific integrated circuits (APPlication Specific Integrated Circuit, ASIC), off-the-shelf Programmable gate array (Field-Programmable GateArray, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc., the processor is the control center of the printing method, and utilizes various interfaces and lines to connect the entire described document printing method. various parts.

The memory can be used to store the computer programs and/or modules, and the processor implements the printing method by running or executing the computer programs and/or modules stored in the memory and calling the data stored in the memory various functions. The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, at least one application program required by a function (such as a sound playback function, a text conversion function, etc.) and the like; the data storage 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 hard disk, internal memory, plug-in hard disk, smart memory card (SmartMedia Card, SMC), secure digital (Secure Digital, SD) card, A flash memory card (Flash Card), at least one magnetic disk storage device, flash memory device, or other volatile solid state storage devices.

Wherein, if the modules for realizing the user terminal are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the present invention realizes all or part of the processes in the methods of the above embodiments, and can also be completed by instructing related hardware through computer programs. The computer program can be stored in a computer-readable storage medium, and the computer When the program is executed by the processor, the steps in the above-mentioned various method embodiments can be realized. Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM, Read-OnlyMemory), Random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal, software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable Excludes electrical carrier signals and telecommunication signals.

It should be noted that the device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physically separated. A unit can be located in one place, or it can be distributed to multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that they have a communication connection, which can be specifically implemented as one or more communication buses or signal lines. It can be understood and implemented by those skilled in the art without creative effort.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of changes or modifications within the technical scope disclosed in the present invention. Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by 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.