Method, device and computer equipment for determining model parameters of plastic material simulation model

Abstract

The present application relates to a method, device and computer equipment for determining model parameters of a plastic material simulation model. The method comprises: obtaining sample size data, sample material property data and plastic stress-strain data of a plastic material sample; using the sample size data, sample material property data and plastic stress-strain data of the plastic material sample as initial model parameters to generate a sample simulation model; using the test conditions of the tensile test as simulation conditions, performing tensile simulation on the sample simulation model to obtain a true stress-strain curve of the sample simulation model; determining the error between the plastic material sample and the sample simulation model according to the true stress-strain curve of the plastic material sample and the true stress-strain curve of the sample simulation model; and determining the sample size data, sample material property data and plastic stress-strain data as model parameters when the error meets a preset condition. The present method can improve the accuracy of the simulation model of the plastic material sample.

Description

Technical Field

[0001] The present application relates to the technical field of plastic materials, and in particular to a method, device, computer equipment, storage medium and computer program product for determining model parameters of a plastic material simulation model. Background Art

[0002] Before performing finite element simulation on plastic materials, it is necessary to input parameter information such as Young's modulus and Poisson's ratio that characterize the constitutive relationship of the plastic material, as well as the relationship information between the plastic strain and the true stress of the plastic material, in order to generate a simulation model close to the actual plastic material, so as to obtain more accurate simulation results as possible.

[0003] At present, in order to make the generated simulation model as close to the actual plastic material as possible, it is often necessary to calibrate the simulation model parameters input into the simulation software. However, when calibrating the simulation model parameters input into the simulation software, the prior art often fails to accurately calibrate the plastic strain, thereby failing to accurately generate a relatively accurate simulation model.

[0004] Therefore, there is a problem in that the simulation model of the plastic material sample generated in the conventional technology is not accurate enough. Summary of the invention

[0005] Based on this, it is necessary to provide a method, device, computer equipment, computer-readable storage medium and computer program product for determining model parameters of a plastic material simulation model that can improve the accuracy of the plastic material sample simulation model in order to address the above technical problems.

[0006] A method for determining model parameters of a plastic material simulation model, comprising:

[0007] Obtaining sample size data obtained by measuring the plastic material sample, and obtaining sample material property data and plastic stress-strain data obtained by performing a tensile test on the plastic material sample;

[0008] Using sample size data, sample material property data and plastic stress-strain data of the plastic material sample as initial model parameters, and generating a sample simulation model of the plastic material sample based on the initial model parameters;

[0009] Taking the test conditions of the tensile test as simulation conditions, the tensile simulation is performed on the sample simulation model to obtain the real stress-strain curve of the sample simulation model;

[0010] Obtaining a true stress-strain curve of the plastic material sample, and determining an error between the plastic material sample and the sample simulation model according to a difference between the true stress-strain curve of the plastic material sample and the true stress-strain curve of the sample simulation model;

[0011] When the error meets the preset conditions, the sample size data, sample material property data and plastic stress-strain data of the plastic material sample are determined as model parameters of the sample simulation model.

[0012] In an exemplary embodiment, obtaining sample material property data and plastic stress-strain data obtained by performing a tensile test on a plastic material sample includes:

[0013] Performing a tensile test on the plastic material sample to obtain Young's modulus, axial tensile force data and axial strain data of the plastic material sample;

[0014] The axial tension data and the axial strain data are converted to obtain the true stress data and the true strain data of the plastic material sample;

[0015] Determine the plastic strain data of the plastic material sample according to Young's modulus, true stress data and true strain data;

[0016] According to the true stress data and plastic strain data of the plastic material sample, the true stress strain data of the plastic material sample in the plastic stage is determined as the plastic stress strain data.

[0017] In an exemplary embodiment, determining plastic strain data of a plastic material sample according to Young's modulus, true stress data, and true strain data includes:

[0018] Determine the elastic strain data of the plastic material sample based on Young's modulus and true stress data;

[0019] The plastic strain data of the plastic material sample is determined according to the elastic strain data and the true strain data of the plastic material sample.

[0020] In an exemplary embodiment, the test conditions of the tensile test are used as simulation conditions, and a tensile simulation is performed on the sample simulation model to obtain a true stress-strain curve of the sample simulation model, including:

[0021] According to the test conditions of the tensile test, the constraint information and displacement load information for the sample simulation model are determined;

[0022] The sample simulation model is constrained by using the constraint information, and a displacement load set by the displacement load information is applied to the sample simulation model to perform a tensile simulation on the sample simulation model;

[0023] Obtain the true stress-strain curve of the sample simulation model in the tensile simulation.

[0024] In an exemplary embodiment, the method further comprises:

[0025] When the error does not satisfy the preset condition, the method returns to the step of obtaining sample size data obtained by measuring the plastic material sample until the error satisfies the preset condition.

[0026] In an exemplary embodiment, before the step of obtaining sample size data obtained by measuring the plastic material sample, the method further includes:

[0027] Determine the material of the plastic material sample to be prepared, and determine the tensile test items for the plastic material sample;

[0028] Based on the material and the tensile test items, the sample preparation standard information is determined; the sample preparation standard information is used to prepare plastic material samples; the sample preparation standard information includes the sample shape and sample size for the plastic material samples.

[0029] A device for determining model parameters of a plastic material simulation model, comprising:

[0030] An acquisition module, used to acquire sample size data obtained by measuring a plastic material sample, and to acquire sample material property data and plastic stress-strain data obtained by performing a tensile test on the plastic material sample;

[0031] A generating module, configured to use the sample size data, the sample material property data and the plastic stress-strain data of the plastic material sample as initial model parameters, and to generate a sample simulation model of the plastic material sample based on the initial model parameters;

[0032] A simulation module, used to use the test conditions of the tensile test as simulation conditions, perform tensile simulation on the sample simulation model, and obtain a true stress-strain curve of the sample simulation model;

[0033] a comparison module, used for obtaining a true stress-strain curve of the plastic material sample, and determining an error between the plastic material sample and the sample simulation model according to a difference between the true stress-strain curve of the plastic material sample and the true stress-strain curve of the sample simulation model;

[0034] A determination module is used to determine the sample size data, the sample material property data and the plastic stress-strain data of the plastic material sample as model parameters of the sample simulation model when the error meets a preset condition.

[0035] A computer device includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0036] A computer-readable storage medium stores a computer program, which implements the steps of the above method when executed by a processor.

[0037] A computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0038] The above-mentioned method, device, computer equipment, storage medium and computer program product for determining model parameters of the plastic material simulation model obtain sample size data obtained by measuring the plastic material sample, and obtain sample material property data and plastic stress-strain data obtained by performing a tensile test on the plastic material sample; use the sample size data, sample material property data and plastic stress-strain data of the plastic material sample as initial model parameters, and generate a sample simulation model of the plastic material sample based on the initial model parameters; use the test conditions of the tensile test as simulation conditions, perform tensile simulation on the sample simulation model, and obtain a true stress-strain curve of the sample simulation model; obtain the true stress-strain curve of the plastic material sample, and generate a sample simulation model of the plastic material sample based on the initial model parameters; use the test conditions of the tensile test as simulation conditions, and perform a tensile simulation on the sample simulation model to obtain a true stress-strain curve of the sample simulation model; obtain the true stress-strain curve of the plastic material sample, and generate a sample simulation model of the plastic material sample based on the initial model parameters; The difference between the true stress-strain curve of the plastic material sample and the true stress-strain curve of the sample simulation model is used to determine the error between the plastic material sample and the sample simulation model; when the error meets the preset conditions, the sample size data, sample material property data and plastic stress-strain data of the plastic material sample are determined as the model parameters of the sample simulation model; in this way, the true stress-strain curves obtained by the tensile test and the tensile simulation respectively can be compared to determine the difference between the plastic material sample and the sample simulation model, thereby determining whether the model parameters used to generate the sample simulation model are accurate, thereby achieving accurate calibration of the model parameters for generating the sample simulation model, which can improve the accuracy of the generated sample simulation model. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 An application environment diagram of a method for determining model parameters of a plastic material simulation model in an embodiment;

[0041] Figure 2 A schematic flow chart of a method for determining model parameters of a plastic material simulation model in an embodiment;

[0042] Figure 3 A schematic diagram of a flow chart of a step of obtaining sample material constitutive data of a plastic material sample in an embodiment;

[0043] Figure 4is a schematic diagram of a stretching simulation in one embodiment;

[0044] Figure 5 A model parameter calibration method for a plastic material simulation model in an embodiment;

[0045] Figure 6 A comparison diagram of calibration effects between a model parameter calibration method of a plastic material simulation model in an embodiment and a common calibration method in a conventional technology;

[0046] Figure 7 A schematic flow chart of a method for determining model parameters of a plastic material simulation model in another embodiment;

[0047] Figure 8 A structural block diagram of a device for determining model parameters of a plastic material simulation model in an embodiment;

[0048] Fig. 9 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0050] The model parameter determination method of the plastic material simulation model provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. Among them, the computer device 102 obtains the sample size data obtained by measuring the plastic material sample, and obtains the sample material property data and plastic stress-strain data obtained by performing a tensile test on the plastic material sample; the computer device 102 uses the sample size data, sample material property data and plastic stress-strain data of the plastic material sample as initial model parameters, and generates a sample simulation model of the plastic material sample based on the initial model parameters; the computer device 102 uses the test conditions of the tensile test as simulation conditions, performs tensile simulation on the sample simulation model, and obtains the real stress-strain curve of the sample simulation model; the computer device 102 obtains the real stress-strain curve of the plastic material sample, and determines the error between the plastic material sample and the sample simulation model according to the difference between the real stress-strain curve of the plastic material sample and the real stress-strain curve of the sample simulation model; the computer device 102 determines the sample size data, sample material property data and plastic stress-strain data of the plastic material sample as the model parameters of the sample simulation model when the error meets the preset conditions.

[0051] In an exemplary embodiment, Figure 2As shown in FIG. 1 , a method for determining model parameters of a plastic material simulation model is provided, and the method is applied to Figure 1 The computer device 102 in the example is used as an example to illustrate, including the following steps S202 to S210. Among them:

[0052] Step S202, obtaining sample size data obtained by measuring the plastic material sample, and obtaining sample material property data and plastic stress-strain data obtained by performing a tensile test on the plastic material sample.

[0053] The plastic material sample may be a sample that needs to be prepared in advance, and the material of the sample is a plastic material. In the embodiment of the present application, the plastic material may be copper.

[0054] The sample size data may be data corresponding to the size of the plastic material sample.

[0055] The tensile test may refer to a test in which a plastic material sample is constrained and a displacement load is applied to the plastic material sample so as to obtain measurement data by stretching the plastic material sample.

[0056] The sample material property data may refer to isotropic elastic data of the plastic material sample, for example, Young's modulus and Poisson's ratio.

[0057] Among them, the plastic stress-strain data can characterize the constitutive characteristics of the plastic material sample, and the plastic stress-strain data refers to the relationship curve between the plastic strain and the true stress of the plastic material sample.

[0058] Among them, plastic strain is relative to elastic strain. Plastic materials will deform under the action of external force. When the deformation does not exceed a certain limit, the deformation will disappear after the external force is removed. This deformation is called elastic deformation. If the external force is large, when its action stops, the deformation caused does not completely disappear, but there is residual deformation, which is called plastic deformation.

[0059] Optionally, the computer device obtains sample size data obtained by measuring the plastic material sample, and obtains isotropic elastic data and a true stress curve of plastic strain obtained by performing a tensile test on the plastic material sample.

[0060] Step S204: using the sample size data, sample material property data and plastic stress-strain data of the plastic material sample as initial model parameters, and generating a sample simulation model of the plastic material sample based on the initial model parameters.

[0061] The initial model parameters may refer to model parameters corresponding to any simulation before the final model parameters of the sample simulation model are determined.

[0062] The sample simulation model may refer to a model used to simulate a plastic material sample.

[0063] Optionally, the computer device inputs the sample size of the plastic material sample, the isotropic elastic data obtained by tensile testing the plastic material sample, and the true stress curve of the plastic strain as initial model parameters into the simulation software, and the simulation software can generate a sample simulation model of the plastic material sample based on the initial model parameters.

[0064] Step S206, using the test conditions of the tensile test as simulation conditions, performing tensile simulation on the sample simulation model to obtain a true stress-strain curve of the sample simulation model.

[0065] The test conditions may refer to the corresponding constraints and displacement loads applied during the tensile test.

[0066] The simulation conditions are consistent with the test conditions during the tensile test, that is, the corresponding constraints and displacement loads applied during the tensile simulation are consistent with the corresponding constraints and displacement loads applied during the tensile test.

[0067] The true stress-strain curve of the sample simulation model refers to the relationship curve between the true strain and the true stress of the sample simulation model.

[0068] Optionally, the computer device uses the test conditions of the tensile test as simulation conditions, performs tensile simulation on the sample simulation model, and obtains a relationship curve between the real strain and the real stress of the sample simulation model.

[0069] Step S208, obtaining a true stress-strain curve of the plastic material sample, and determining an error between the plastic material sample and the sample simulation model according to a difference between the true stress-strain curve of the plastic material sample and the true stress-strain curve of the sample simulation model.

[0070] The true stress-strain curve of the plastic material sample refers to the relationship curve between the true strain and true stress of the plastic material sample. The true stress-strain curve of the plastic material sample may be calculated when performing a tensile test on the plastic material sample in step S202.

[0071] Optionally, the computer device obtains a true stress-strain curve of the plastic material sample, and then determines the error between the plastic material sample and the sample simulation model based on the difference between the true stress-true strain curve of the plastic material sample and the true stress-true strain curve of the sample simulation model.

[0072] Step S210: when the error meets the preset conditions, the sample size data, the sample material property data and the plastic stress-strain data of the plastic material sample are determined as the model parameters of the sample simulation model.

[0073] The model parameters may refer to the final model parameters of the plastic material simulation model, and the similarity between the sample simulation model generated by the model parameters and the plastic material sample meets a preset threshold.

[0074] The error meeting the preset condition may mean that the error is within ±1%.

[0075] Optionally, when the error meets a preset condition, the computer device determines the relationship curve between the sample size data, isotropic elastic data and plastic strain true stress of the plastic material sample as the model parameters of the plastic material simulation model.

[0076] In practical applications, the computer equipment determines the sample size data, isotropic elastic data and plastic strain-true stress curve of the plastic material sample as the model parameters of the plastic material simulation model when the error is within ±1%. At this time, the calibration of the model parameters of the plastic material simulation model is completed.

[0077] The method for determining the model parameters of the above-mentioned plastic material simulation model is to obtain the sample size data obtained by measuring the plastic material sample, and obtain the sample material property data and plastic stress-strain data obtained by performing a tensile test on the plastic material sample; use the sample size data, sample material property data and plastic stress-strain data of the plastic material sample as initial model parameters, and generate a sample simulation model of the plastic material sample based on the initial model parameters; use the test conditions of the tensile test as simulation conditions, perform tensile simulation on the sample simulation model, and obtain the real stress-strain curve of the sample simulation model; obtain the real stress-strain curve of the plastic material sample, and generate the real stress-strain curve of the plastic material sample according to the real stress of the plastic material sample. The difference between the real stress-strain curve of the tensile test and the real stress-strain curve of the sample simulation model is used to determine the error between the plastic material sample and the sample simulation model; when the error meets the preset conditions, the sample size data, sample material property data and plastic stress-strain data of the plastic material sample are determined as the model parameters of the sample simulation model; in this way, the real stress-strain curves obtained by the tensile test and the tensile simulation respectively can be compared to determine the difference between the plastic material sample and the sample simulation model, so as to determine whether the model parameters used to generate the sample simulation model are accurate, thereby realizing accurate calibration of the model parameters for generating the sample simulation model, which can improve the accuracy of the generated sample simulation model.

[0078] In an exemplary embodiment, Figure 3 As shown, step S202 includes steps S302 to S308. Among them:

[0079] Step S302: Perform a tensile test on the plastic material sample to obtain Young's modulus, axial tensile force data, and axial strain data of the plastic material sample.

[0080] Optionally, the computer device performs a tensile test on the plastic material sample to obtain original test data of the tensile test, including Young's modulus, axial tensile force data and axial strain data of the plastic material sample.

[0081] In practical applications, computer equipment performs tensile tests on plastic material samples to obtain original test data of the tensile tests. The original test data may include multiple sets of data consisting of time, axial displacement, axial strain, and axial tension.

[0082] Step S304: converting the axial tension data and the axial strain data to obtain the true stress data and the true strain data of the plastic material sample.

[0083] Among them, the true stress data refers to the actual stress value that the material bears in the mechanical response, which takes into account the geometric configuration of the object and its size effect; the true strain data measures the actual deformation degree of the material under stress, which covers the consideration of the volume change of the material. The true strain, also known as engineering strain, refers to the deformation caused by the object being stretched or compressed by external force, that is, the ratio of the change in unit length or unit area to the initial length or area.

[0084] Among them, the corresponding conversion method when converting axial strain data into true strain data is expressed as:

[0085] ;

[0086] Represents the true strain, Characterize axial strain;

[0087] Among them, the corresponding conversion method when converting axial tension data into true stress data is expressed as:

[0088] ;

[0089] Represents the true stress, Characterize engineering stress; engineering stress is expressed as:

[0090] ;

[0091] F represents the axial tensile force and A represents the cross-sectional area of ​​the plastic material sample.

[0092] After obtaining the true strain data and the true stress data, the true strain data and the true stress data are matched one by one to draw a true stress-true strain curve.

[0093] Optionally, the computer device converts the axial tension data and the axial strain data to obtain the true stress data and the true strain data of the plastic material sample.

[0094] Step S306, determining the plastic strain data of the plastic material sample according to the Young's modulus, the true stress data and the true strain data of the plastic material sample.

[0095] Optionally, the computer device divides the true stress data of the plastic material sample by the Young's modulus of the plastic material sample to obtain elastic strain data, and the computer device then subtracts the elastic strain data from the true strain data to determine the plastic strain data of the plastic material sample.

[0096] In practical applications, the calculation method of plastic strain data is: first use (True stress / Young's modulus) to obtain the elastic strain data, and then use the true strain data-elastic strain data to obtain the plastic strain data.

[0097] Step S308, determining the true stress-strain data of the plastic material sample in the plastic stage according to the true stress data and plastic strain data of the plastic material sample as plastic stress-strain data.

[0098] Optionally, the computer device determines the true stress-strain data of the plastic material sample in the plastic stage as the plastic stress-strain data based on the true stress data and plastic strain data of the plastic material sample.

[0099] In practical applications, after calculating the plastic strain, the computer equipment discards inappropriate data (such as the stress in the next second is less than that in the previous second), and finally changes the minimum plastic strain to 0, thereby obtaining the plastic stress-strain data of the plastic material sample. The plastic stress-strain data is the real stress-strain data in the plastic stage.

[0100] In this embodiment, by performing a tensile test on the plastic material sample, Young's modulus, axial tensile force data and axial strain data of the plastic material sample are obtained; the axial tensile force data and the axial strain data are converted to obtain true stress data and true strain data of the plastic material sample; according to the Young's modulus, the true stress data and the true strain data of the plastic material sample, the plastic strain data of the plastic material sample is determined; based on the plastic strain data and the true strain data of the plastic material sample, the true stress strain data of the plastic material sample in the plastic stage is determined as the plastic stress strain data; in this way, the plastic strain-true stress curve of the plastic material sample can be accurately determined through the test data obtained by the tensile test.

[0101] In an exemplary embodiment, plastic strain data of a plastic material sample is determined based on Young's modulus, true stress data, and true strain data, including: determining elastic strain data of the plastic material sample based on Young's modulus and true stress data of the plastic material sample; determining plastic strain data of the plastic material sample based on the elastic strain data and true strain data of the plastic material sample.

[0102] Optionally, the computer device divides the true stress data of the plastic material sample by the Young's modulus data of the plastic material sample to obtain elastic strain data, and the computer device then subtracts the elastic strain data from the true strain data to determine the plastic strain data of the plastic material sample.

[0103] In this embodiment, the elastic strain data of the plastic material sample is determined based on the Young's modulus and true stress data of the plastic material sample; the plastic strain data of the plastic material sample is determined based on the elastic strain data and true strain data of the plastic material sample; in this way, the plastic strain of the plastic material sample can be accurately determined.

[0104] In an exemplary embodiment, the test conditions of the tensile test are used as simulation conditions, and a tensile simulation is performed on the sample simulation model to obtain a true stress-strain curve of the sample simulation model, including: determining constraint information and displacement load information for the sample simulation model according to the test conditions of the tensile test; constraining the sample simulation model using the constraint information, and applying a displacement load set by the displacement load information to the sample simulation model to perform a tensile simulation on the sample simulation model; and collecting the true stress-strain curve of the sample simulation model in the tensile simulation.

[0105] The constraint information and displacement load information may be boundary conditions set in the mechanical system.

[0106] The true stress-strain curve of the sample simulation model refers to the relationship curve between the true strain and the true stress obtained by performing tensile simulation on the sample simulation model.

[0107] Optionally, the computer device determines the constraint information and displacement load information for the sample simulation model according to the test conditions of the tensile test, the computer device uses the constraint information to constrain the sample simulation model, and applies the displacement load set by the displacement load information to the sample simulation model to perform tensile simulation on the sample simulation model, and the computer device then collects the real stress-strain curve of the sample simulation model in the tensile simulation.

[0108] In practical applications, when constraining and applying displacement loads, it is necessary to fix the left end and apply displacement loads on the right end to perform stretching simulation, such as Figure 4 shown.

[0109] In this embodiment, constraint information and displacement load information for the sample simulation model are determined according to the test conditions of the tensile test; the sample simulation model is constrained by the constraint information, and the displacement load set by the displacement load information is applied to the sample simulation model to perform tensile simulation on the sample simulation model; the true stress-strain curve of the sample simulation model in the tensile simulation is collected; in this way, the sample simulation model can be tensile simulated according to the test conditions of the tensile test, so as to obtain the true stress-strain curve of the sample simulation model, which is conducive to the subsequent difference determination of the true stress-strain curve of the plastic material sample and the true stress-strain curve of the sample simulation model.

[0110] In an exemplary embodiment, the method further includes: if the error does not satisfy a preset condition, returning to the step of obtaining sample size data obtained by measuring the plastic material sample until the error satisfies the preset condition.

[0111] Optionally, the computer device obtains sample size data obtained by measuring the plastic material sample, and obtains a relationship curve between isotropic elastic data and plastic strain true stress obtained by performing a tensile test on the plastic material sample. The computer device uses the sample size of the plastic material sample, the relationship curve between isotropic elastic data and plastic strain true stress obtained by performing a tensile test on the plastic material sample as initial model parameters, and generates a sample simulation model of the plastic material sample based on the initial model parameters. The computer device uses the test conditions of the tensile test as simulation conditions, performs a tensile simulation on the sample simulation model, and obtains a true stress and true strain curve of the sample simulation model. The computer device determines the error between the plastic material sample and the sample simulation model based on the difference between the true stress and true strain curve of the plastic material sample and the true stress and true strain curve of the sample simulation model. If the error does not meet the preset condition, the computer device returns to the step of obtaining the sample size data obtained by measuring the plastic material sample until the error meets the preset condition.

[0112] In this embodiment, when the error does not meet the preset conditions, the step of returning to the step of obtaining the sample size data obtained by measuring the plastic material sample is repeated until the error meets the preset conditions. In this way, the model parameters input into the plastic material simulation model can be accurately calibrated.

[0113] In an exemplary embodiment, before the step of obtaining sample size data measured for the plastic material sample, the method also includes: determining the material of the plastic material sample to be prepared, and determining the tensile test items for the plastic material sample; determining sample preparation standard information based on the material and the tensile test items; the sample preparation standard information is used to prepare the plastic material sample; the sample preparation standard information includes the sample shape and sample size for the plastic material sample.

[0114] The material may be copper.

[0115] Among them, the tensile test items may refer to Young's modulus, yield strength, etc.

[0116] Among them, the sample preparation standard information can be the reference standard followed when preparing plastic material samples. The secondary reference standard in the embodiment of the present application is GB / T 228.1-2021. The specifications of the sample in this standard include the shape of the sample, the size of the sample, the shape of the sample cross section, etc. The information recorded in the reference standard includes but is not limited to terms and definitions, test temperature, shape and size of the sample, sample type (such as thin plate, plate, wire, bar, etc.), relevant requirements for the selection of original gauge length and extensometer gauge length, sample clamping method, test rate, sampling frequency requirements, requirements for measuring elastic modulus, etc.

[0117] Optionally, the computer device determines the material of the plastic material sample to be prepared and the tensile test items for the plastic material sample. The computer device consults relevant standards based on the material and the tensile test items to determine the sample preparation standard information, including the sample shape and sample size for the plastic material sample.

[0118] In this embodiment, the material of the plastic material sample to be prepared is determined, and the tensile test items for the plastic material sample are determined; based on the material and the tensile test items, the sample preparation standard information is determined; the sample preparation standard information is used to prepare the plastic material sample; the sample preparation standard information includes the sample shape and sample size for the plastic material sample; in this way, it can be ensured that the prepared plastic material sample meets the sample preparation standard, which is conducive to ensuring the reliability of the tensile test results and the tensile simulation results.

[0119] In order to facilitate the understanding of those skilled in the art, Figure 5 A model parameter calibration method for a plastic material simulation model is exemplarily provided, the purpose of which is to obtain relatively accurate model parameters by calibrating the model parameters of the plastic material simulation model.

[0120] The steps in the testing phase include:

[0121] Step 1: Determine the sample preparation standard for plastic material samples;

[0122] Step 2: Prepare plastic material samples according to sample preparation standards;

[0123] Step 3: Determine whether the size of the plastic material sample meets the sample preparation standard. If not, return to step 2. If yes, proceed to step 4.

[0124] Step 4: Perform a tensile test on the plastic material sample to obtain test data, process the test data and draw a graph, including a plastic strain-true stress curve. The curve data of the plastic strain-true stress curve is shown in Table 1 below.

[0125] Table 1

[0126]

[0127] The steps in the simulation phase include:

[0128] Step 1: Measure the dimensions of the plastic material sample;

[0129] Step 2: Draw a three-dimensional model of the plastic material sample according to the measured dimensions;

[0130] Step 3: using the isotropic elastic data and the plastic strain-true stress curve of the plastic material sample obtained in the test phase as initial model parameters of the plastic material simulation model, and generating a sample simulation model of the plastic material sample based on the initial model parameters;

[0131] Step 4: Perform tensile simulation on the sample simulation model according to the test conditions of the test phase to obtain simulation results, including the true stress-true strain curve.

[0132] Finally, the two true stress-true strain curves in the test phase and the simulation phase are compared to determine whether the error is within ±1%. If not, return to steps 2 and 3 in the simulation phase. If so, the calibration of the model parameters is completed, and the isotropic elastic data and plastic strain-true stress curve of the plastic material sample obtained in the test phase are used as the model parameters of the plastic material simulation model.

[0133] The comparison of the calibration effect between the model parameter calibration method of the plastic material simulation model of the present application and the common calibration method in the traditional technology is shown in the figure below: Figure 6 As shown, in the plastic strain value-taking method in the traditional technology, the strain includes the elastic strain, while in the plastic strain value-taking method of the present application, the strain of only the plastic strain part is calculated by "true strain-elastic strain", so the value-taking method is more accurate.

[0134] Figure 6 The left side of the middle diagram is a comparison of the true stress-true strain curve in the simulation stage and the true stress-true strain curve in the test stage obtained by the common calibration method. Figure 6 The middle right side is a comparison diagram of the true stress-true strain curve in the simulation stage and the true stress-true strain curve in the test stage obtained by the calibration method of the present application. The most significant difference between the left and right sides is the part within the black dotted circle. The two true stress-true strain curves within the black dotted circle on the right side fit more perfectly than those on the left.

[0135] In another embodiment, Figure 7 As shown in FIG. 1 , a method for determining model parameters of a plastic material simulation model is provided, and the method is applied to Figure 1 The computer device 102 in the example is used as an example to illustrate, and the following steps are included:

[0136] Step S702, obtaining sample size data obtained by measuring the plastic material sample, and obtaining sample material property data and plastic stress-strain data obtained by performing a tensile test on the plastic material sample.

[0137] Step S704: using the sample size data, sample material property data and plastic stress-strain data of the plastic material sample as initial model parameters, and generating a sample simulation model of the plastic material sample based on the initial model parameters.

[0138] Step S706, determining the constraint information and displacement load information for the sample simulation model according to the test conditions of the tensile test.

[0139] Step S708: Constrain the sample simulation model using the constraint information, and apply the displacement load set by the displacement load information to the sample simulation model to perform tensile simulation on the sample simulation model.

[0140] Step S710, obtaining a true stress-strain curve of the sample simulation model in the tensile simulation.

[0141] Step S712, obtaining a true stress-strain curve of the plastic material sample, and determining an error between the plastic material sample and the sample simulation model according to a difference between the true stress-strain curve of the plastic material sample and the true stress-strain curve of the sample simulation model.

[0142] Step S714: when the error meets the preset conditions, the sample size data, the sample material property data and the plastic stress-strain data of the plastic material sample are determined as model parameters of the sample simulation model.

[0143] It should be noted that the specific limitations of the above steps can refer to the specific limitations of the method for determining model parameters of a plastic material simulation model mentioned above.

[0144] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0145] Based on the same inventive concept, the embodiment of the present application also provides a device for determining model parameters of a plastic material simulation model for implementing the method for determining model parameters of a plastic material simulation model involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of the device for determining model parameters of one or more plastic material simulation models provided below can refer to the limitations of the method for determining model parameters of a plastic material simulation model above, and will not be repeated here.

[0146] In an exemplary embodiment, Figure 8 As shown, a model parameter determination device for a plastic material simulation model is provided, comprising: an acquisition module 802, a generation module 804, a simulation module 806, a comparison module 808 and a determination module 810, wherein:

[0147] An acquisition module 802 is used to acquire sample size data obtained by measuring the plastic material sample, and to acquire sample material property data and plastic stress-strain data obtained by performing a tensile test on the plastic material sample;

[0148] A generating module 804 is used to use the sample size data, sample material property data and plastic stress-strain data of the plastic material sample as initial model parameters, and to generate a sample simulation model of the plastic material sample based on the initial model parameters;

[0149] The simulation module 806 is used to use the test conditions of the tensile test as simulation conditions to perform tensile simulation on the sample simulation model to obtain a true stress-strain curve of the sample simulation model;

[0150] A comparison module 808 is used to obtain a true stress-strain curve of the plastic material sample, and determine an error between the plastic material sample and the sample simulation model according to a difference between the true stress-strain curve of the plastic material sample and the true stress-strain curve of the sample simulation model;

[0151] The determination module 810 is used to determine the sample size data, sample material property data and plastic stress-strain data of the plastic material sample as model parameters of the sample simulation model when the error meets the preset conditions.

[0152] In an exemplary embodiment, the acquisition module 802 is specifically used to perform a tensile test on a plastic material sample to obtain Young's modulus, axial tensile force data and axial strain data of the plastic material sample; convert the axial tensile force data and the axial strain data to obtain true stress data and true strain data of the plastic material sample; determine the plastic strain data of the plastic material sample based on the Young's modulus, the true stress data and the true strain data; determine the true stress strain data of the plastic material sample in the plastic stage based on the true stress data and the plastic strain data of the plastic material sample as plastic stress strain data.

[0153] In an exemplary embodiment, the acquisition module 802 is specifically used to determine the elastic strain data of the plastic material sample according to the Young's modulus and the true stress data; and to determine the plastic strain data of the plastic material sample according to the elastic strain data and the true strain data of the plastic material sample.

[0154] In an exemplary embodiment, the simulation module 806 is specifically used to determine the constraint information and displacement load information for the sample simulation model according to the test conditions of the tensile test; use the constraint information to constrain the sample simulation model, and apply the displacement load set by the displacement load information to the sample simulation model to perform tensile simulation on the sample simulation model; obtain the real stress-strain curve of the sample simulation model in the tensile simulation.

[0155] In an exemplary embodiment, the device further includes: a return module, which is used to return to the step of obtaining sample size data obtained by measuring the plastic material sample when the error does not meet the preset condition, until the error meets the preset condition.

[0156] In an exemplary embodiment, the device also includes: a sample preparation module, which is used to determine the material of the plastic material sample to be prepared, and to determine the tensile test items for the plastic material sample; based on the material and the tensile test items, determine the sample preparation standard information; the sample preparation standard information is used to prepare the plastic material sample; the sample preparation standard information includes the sample shape and sample size for the plastic material sample.

[0157] Each module in the model parameter determination device of the above-mentioned plastic material simulation model can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each of the above modules.

[0158] In an exemplary embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as shown in FIG. Fig. 9 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store model parameter determination data of a plastic material simulation model. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for determining model parameters of a plastic material simulation model is implemented.

[0159] Those skilled in the art will understand that Fig. 9 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0160] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method for determining model parameters of a plastic material simulation model described above. The steps of the method for determining model parameters of a plastic material simulation model here may be the steps of the method for determining model parameters of a plastic material simulation model described above in each of the embodiments.

[0161] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the processor executes the steps of the method for determining model parameters of a plastic material simulation model described above. The steps of the method for determining model parameters of a plastic material simulation model here may be the steps in the method for determining model parameters of a plastic material simulation model described above in each of the embodiments.

[0162] In an exemplary embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the processor executes the steps of the method for determining model parameters of a plastic material simulation model. The steps of the method for determining model parameters of a plastic material simulation model here may be the steps in the method for determining model parameters of a plastic material simulation model of each of the above embodiments.

[0163] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0164] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0165] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for determining model parameters of a plastic material simulation model, characterized in that: The method comprises: Acquiring sample size data measured from a plastic material sample; the plastic material sample is prepared in advance based on sample preparation standard information; Acquiring sample material property data and plastic stress-strain data obtained by performing a tensile test on the plastic material sample, specifically comprising: performing the tensile test on the plastic material sample to obtain Young's modulus, axial tension data and axial strain data of the plastic material sample; converting the axial tension data and the axial strain data to obtain true stress data and true strain data of the plastic material sample; determining the plastic strain data of the plastic material sample according to the Young's modulus, the true stress data and the true strain data; determining the true stress-strain data of the plastic material sample in the plastic stage according to the true stress data and the plastic strain data of the plastic material sample as the plastic stress-strain data; Using the sample size data, the sample material property data and the plastic stress-strain data of the plastic material sample as initial model parameters, and generating a sample simulation model of the plastic material sample based on the initial model parameters; The test conditions of the tensile test are used as simulation conditions to perform tensile simulation on the sample simulation model to obtain a true stress-strain curve of the sample simulation model, specifically including: determining constraint information and displacement load information for the sample simulation model according to the test conditions of the tensile test; constraining the sample simulation model using the constraint information, and applying a displacement load set by the displacement load information to the sample simulation model to perform tensile simulation on the sample simulation model; and obtaining a true stress-strain curve of the sample simulation model in the tensile simulation; Obtaining a true stress-strain curve of the plastic material sample, and determining an error between the plastic material sample and the sample simulation model according to a difference between the true stress-strain curve of the plastic material sample and the true stress-strain curve of the sample simulation model; In a case where the error meets a preset condition, the sample size data, the sample material property data and the plastic stress-strain data of the plastic material sample are determined as model parameters of the sample simulation model.

2. The method according to claim 1, characterized in that Determining the plastic strain data of the plastic material sample according to the Young's modulus, the true stress data and the true strain data comprises: Determining elastic strain data of the plastic material sample according to the Young's modulus and the true stress data; Plastic strain data of the plastic material sample is determined according to the elastic strain data and the true strain data of the plastic material sample.

3. The method according to claim 1, characterized in that The method further comprises: In the case that the error does not satisfy the preset condition, the process returns to the step of obtaining the sample size data obtained by measuring the plastic material sample until the error satisfies the preset condition.

4. The method according to claim 1, characterized in that Before the step of obtaining sample size data obtained by measuring the plastic material sample, the method further includes: Determining the material of the plastic material sample to be prepared, and determining the tensile test items for the plastic material sample; Based on the material and the tensile test item, sample preparation standard information is determined; the sample preparation standard information is used to prepare the plastic material sample; the sample preparation standard information includes a sample shape and a sample size for the plastic material sample.

5. A device for determining model parameters of a plastic material simulation model, characterized in that: The device comprises: An acquisition module is used to acquire sample size data obtained by measuring a plastic material sample; the plastic material sample is prepared in advance based on sample preparation standard information; acquire sample material property data and plastic stress-strain data obtained by performing a tensile test on the plastic material sample, specifically comprising: performing the tensile test on the plastic material sample to obtain Young's modulus, axial tension data and axial strain data of the plastic material sample; converting the axial tension data and the axial strain data to obtain true stress data and true strain data of the plastic material sample; determining the plastic strain data of the plastic material sample according to the Young's modulus, the true stress data and the true strain data; determining the true stress strain data of the plastic material sample in the plastic stage according to the true stress data and the plastic strain data of the plastic material sample as the plastic stress strain data; A generating module, configured to use the sample size data, the sample material property data and the plastic stress-strain data of the plastic material sample as initial model parameters, and to generate a sample simulation model of the plastic material sample based on the initial model parameters; A simulation module, for taking the test conditions of the tensile test as simulation conditions, performing tensile simulation on the sample simulation model, and obtaining a true stress-strain curve of the sample simulation model, specifically comprising: determining constraint information and displacement load information for the sample simulation model according to the test conditions of the tensile test; using the constraint information to constrain the sample simulation model, and applying a displacement load set by the displacement load information to the sample simulation model, so as to perform tensile simulation on the sample simulation model; and obtaining a true stress-strain curve of the sample simulation model in the tensile simulation; a comparison module, used for obtaining a true stress-strain curve of the plastic material sample, and determining an error between the plastic material sample and the sample simulation model according to a difference between the true stress-strain curve of the plastic material sample and the true stress-strain curve of the sample simulation model; A determination module is used to determine the sample size data, the sample material property data and the plastic stress-strain data of the plastic material sample as model parameters of the sample simulation model when the error meets a preset condition.

6. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

8. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

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