VPSC model construction method based on ABAQUS sub-model

Abstract

The invention discloses a VPSC model construction method based on an ABAQUS sub-model, and belongs to the field of computational material science and engineering.The VPSC model construction method comprises the steps that a global model is established according to the size of a part, and an ABAQUS input file is generated; selecting a local area of a part in the global model, determining a unit number of the area, constructing a crystal plasticity constitutive model through UMAT, and adding a plurality of randomly oriented crystal grains to the local area in an ABAQUS input file to form a reference model; grain nodes and orientation information in the reference model are read through an ABAQUS script, a grain model is created, corresponding orientation is given to sub-models, sub-model boundary conditions consistent with global model deformation are applied to grain geometric boundaries, and a VPSC model is constructed. According to the method, the grain orientation is locally refined through the sub-model technology, and the VPSC sub-model is automatically generated in combination with the script, so that the calculation complexity is remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the field of computational materials science and engineering, and specifically to a VPSC (viscoplastic self-consistent model) model construction method based on an ABAQUS sub-model, which is suitable for efficiently simulating the plastic deformation and microstructural evolution of polycrystalline metal materials. Background Art

[0002] The plastic deformation behavior of metal materials is significantly affected by microstructures such as grain orientation and grain boundary distribution. The viscoplastic self-consistent model (VPSC) is based on inclusion theory and establishes the interaction equations between single crystals and polycrystals in a self-consistent manner. It can effectively predict the macroscopic mechanical response and microstructural evolution. The VPSC model is often used as a crystal plasticity constitutive model and combined with multi-scale methods such as finite element method to simulate the plastic deformation behavior of metal materials, such as the microstructural evolution of aluminum alloys and the twinning behavior of magnesium alloys. The existing VPSC model couples the single crystal and polycrystal responses through a self-consistent method and directly embeds the VPSC constitutive model using a global finite element model, resulting in huge consumption of computing resources and low efficiency of manual parameter adjustment. It has defects such as high computational complexity and difficulty in handling large-scale engineering problems. For example, patent CN119016499A discloses a method combining FEM-VPSC and machine learning, but does not solve the problems of local refined modeling and automatic generation. Therefore, there is an urgent need for a VPSC model construction method that can reduce the computational burden and improve modeling efficiency. Summary of the Invention

[0003] Technical problems solved: In response to the technical problems existing in the prior art, the present invention provides a VPSC model construction method based on ABAQUS sub-model. The sub-model technology is used to locally refine the grain orientation, and the VPSC sub-model is automatically generated by scripts, which significantly reduces the computational complexity.

[0004] Technical solution: The present invention provides a method for constructing a VPSC model based on an ABAQUS sub-model, comprising the following steps: Step 1: Establish a global model based on the part size, including creating components, meshing, importing material constitutive equations, setting interactions and analysis steps, and generating ABAQUS input files; Step 2: Select a local region of the component in the global model, determine the element number of the region, construct a crystal plasticity constitutive model using UMAT, and add multiple randomly oriented grains to the local region in the ABAQUS input file to form a reference model; Step 3: Read the grain nodes and orientation information in the reference model through the ABAQUS script, create a grain model, assign corresponding orientations to the sub-model, and apply sub-model boundary conditions consistent with the global model deformation to the grain geometric boundaries to construct the VPSC model.

[0005] Preferably, the specific steps of step 1 are: Step 11: Create components and divide the mesh according to the part size. The mesh size is determined according to the material properties and simulation accuracy requirements. Step 12: Import the constitutive equation of the material, which includes Young's modulus, Poisson's ratio and friction coefficient parameters: Step 13: Set the model interactions, analysis steps, and loads, and generate the ABAQUS input INP file for the global model.

[0006] Preferably, the local area in step 2 is selected based on the area with stress concentration or significant deformation in the global model and is marked by unit number.

[0007] Preferably, the randomly oriented grains are achieved by modifying the material orientation parameters in the INP file, and the grain orientation obeys a uniform distribution or a specific texture distribution.

[0008] Preferably, the method is suitable for simulating microstructure evolution in metal rolling, forging or extrusion processes.

[0009] The present invention provides a VPSC model construction method based on ABAQUS sub-model, which achieves the following technical effects: 1. The method of the present invention uses ABAQUS sub-modeling technology and the crystal plasticity constitutive model to refine modeling only in key areas, reducing the global computational workload. It proposes a process of "global model → local grain orientation addition → script construction of sub-model" and utilizes ABAQUS sub-model boundary conditions to achieve efficient polycrystalline simulation and quickly generate VPSC models. Compared with existing technologies, this method solves the bottleneck of computational efficiency, significantly reduces computational complexity, and greatly improves computational efficiency. 2. The method of the present invention realizes automated modeling. The script automatically generates sub-models and boundary conditions, avoiding manual adjustment errors. The automated script replaces manual adjustment, improving modeling speed and accuracy. The sub-model technology reduces the global computing burden and can simulate a variety of complex situations, making it suitable for large-scale engineering problems. 3. The method of the present invention can meet the needs of metal plastic forming simulation, polycrystalline material performance prediction, aerospace / automotive lightweight design, especially the microstructure evolution analysis of complex materials (such as magnesium alloys and high-temperature alloys). It is suitable for microstructure prediction of rolling, forging and other processes, and supports the performance optimization of polycrystalline materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A flowchart of the VPSC model construction method based on the ABAQUS sub-model provided by the present invention; Figure 2The rolled plate structure of the global model in the VPSC model construction method based on the ABAQUS sub-model provided in Example 1 of the present invention; Figure 3 The roller structure of the global model in the VPSC model construction method based on the ABAQUS sub-model provided in Example 1 of the present invention; Figure 4 An assembly of the global model described in the VPSC model construction method based on ABAQUS sub-model provided in Example 1 of the present invention; Figure 5 The local grain orientation region of the reference model in the VPSC model construction method based on the ABAQUS sub-model provided in Example 1 of the present invention; Figure 6 The grain model construction process of the VPSC model construction method based on the ABAQUS sub-model provided in Example 1 of the present invention ((a) ABAQUS sub-model; (b) grain sub-model; (c) boundary conditions applied to the grain geometric boundaries); Figure 7 The global model construction process of the VPSC model construction method based on the ABAQUS sub-model provided in Example 1 of the present invention ((a) global model initial state simulation results; (b) global model intermediate state simulation results; (c) global model final state simulation results); Figure 8 The sub-model construction process of the VPSC model construction method based on ABAQUS sub-model provided in Example 1 of the present invention ((a) sub-model initial state simulation results; (b) sub-model intermediate state simulation results; (c) sub-model final state simulation results). DETAILED DESCRIPTION

[0011] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following Figures 1-8 The technical solutions of the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0012] Taking the rolling process as an example, the VPSC model is constructed using the method of the present invention.

[0013] Example 1: Figure 1 As shown, the VPSC model construction method based on the ABAQUS sub-model of the present invention includes the following steps: (1) Establish a global model based on the part size, including creating components, dividing the mesh, importing material constitutive equations, setting interactions and analysis steps, and generating ABAQUS input files; the specific steps are as follows: (1) Create components and divide the mesh according to the part size. The mesh size is determined according to the material properties and simulation accuracy requirements; (2) Import the constitutive equation of the material, which includes Young's modulus, Poisson's ratio and friction coefficient parameters: (3) Set the model interactions, analysis steps, and loads, and generate the ABAQUS input INP file for the global model.

[0014] In Example 1 of the present invention, the size of the rolled plate is 29×2 mm 2 (like Figure 2 The roller is an analytical rigid body with a diameter of 125 mm (as shown in Figure 3 As shown); Global model assembly (as shown Figure 4 As shown in the figure), the component material in this model is aluminum alloy, and the relevant material parameters are: Young's modulus 70000, Poisson's ratio 0.35, friction coefficient 0.1, and grid size 0.0625×0.0625mm 2 .

[0015] (2) A local area of ​​the component in the global model is selected, and the local area is selected based on the area with stress concentration or significant deformation in the global model and marked by unit number. A crystal plasticity constitutive model is constructed by UMAT, and a plurality of randomly oriented grains are added to the local area in the ABAQUS input file (INP file). The randomly oriented grains are realized by modifying the material orientation parameters in the INP file. The grain orientation obeys uniform distribution or specific texture distribution to form a reference model (such as Figure 5 shown).

[0016] (3) The grain nodes and orientation information in the reference model are read through the ABAQUS script, a grain particle model is created, the corresponding orientation is assigned to the sub-model, and the sub-model boundary conditions consistent with the global model deformation are applied to the grain geometric boundary to construct the VPSC model.

[0017] After the reference model is established, the grain area in the reference model is used as a sub-model modeling reference, and the node and orientation information corresponding to each grain is output (such as Figure 6 Execute the ABAQUS script to read the node corresponding to the grain, thereby creating a sub-model component whose shape and size are consistent with the grain shape and size (as shown in Figure 6 (b)); assign the corresponding material orientation to the sub-model components through ABAQUS scripts, and apply sub-model boundary conditions to the component geometric boundaries (such as Figure 6(as shown in (c)); this boundary condition makes the geometric boundary deformation of the sub-model grain consistent with the deformation of the global model, thereby realizing the construction of the VPSC sub-model.

[0018] Figure 7 are the simulation results of the global model, where (a) is the simulation result of the initial rolling state; (b) is the simulation result of the intermediate rolling state; and (c) is the simulation result of the final rolling state. Figure 8 The simulation results of the VPSC sub-model are shown in Figure 1, where (a) is the initial rolling state, (b) is the intermediate rolling state, and (c) is the final rolling state. Figure 7 and Figure 8 It can be seen that by comparing the deformation results of the global model and the VPSC sub-model, it is shown that the method of the present invention uses ABAQUS sub-model technology and the crystal plasticity constitutive model to refine the modeling of key areas only, reduce the global calculation amount, and propose a "global model → local grain orientation addition → script construction sub-model" process. The ABAQUS sub-model boundary conditions are used to achieve efficient polycrystalline simulation and can quickly generate the VPSC model. Compared with the existing technology, it solves the bottleneck of computational efficiency, significantly reduces computational complexity, and greatly improves computational efficiency.

[0019] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A VPSC model construction method based on ABAQUS sub-model, characterized in that: The following steps are involved: Step 1: Establish a global model based on the part size, including creating components, meshing, importing material constitutive equations, setting interactions and analysis steps, and generating ABAQUS input files; Step 2: Select a local region of the component in the global model, determine the element number of the region, construct a crystal plasticity constitutive model using UMAT, and add multiple randomly oriented grains to the local region in the ABAQUS input file to form a reference model; Step 3: Read the grain nodes and orientation information in the reference model through the ABAQUS script, create a grain model, assign corresponding orientations to the sub-model, and apply sub-model boundary conditions consistent with the global model deformation to the grain geometric boundaries to construct the VPSC model.

2. The VPSC model construction method based on ABAQUS sub-model according to claim 1 is characterized in that, Step 1 The specific steps are: Step 11: Create components and divide the mesh according to the part size. The mesh size is determined according to the material properties and simulation accuracy requirements. Step 12: Import the constitutive equation of the material, which includes Young's modulus, Poisson's ratio and friction coefficient parameters: Step 13: Set the model interactions, analysis steps, and loads, and generate the ABAQUS input INP file for the global model.

3. The VPSC model construction method based on ABAQUS sub-model according to claim 1 is characterized in that, The local areas described in step 2 are selected based on the areas with stress concentration or significant deformation in the global model and are marked by element numbers.

4. The VPSC model construction method based on ABAQUS sub-model according to claim 2 is characterized in that, The randomly oriented grains are achieved by modifying the material orientation parameters in the INP file, and the grain orientation obeys a uniform distribution or a specific texture distribution.

5. The VPSC model construction method based on the ABAQUS sub-model according to any one of claims 1 to 4, characterized in that: The method is suitable for simulating microstructure evolution in metal rolling, forging or extrusion processes.

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