Volume element mechanical property analysis method based on composite material plate

Abstract

The invention provides a mechanical property analysis method based on a composite material plate, which comprises the following steps: carrying out grid division on a composite material plate microscopic physical model to establish a target composite material plate grid model, the target composite material plate grid model comprising a metal part and a non-metal part; connecting the metal part and the non-metal part by adopting a selected contact mode to obtain a composite material plate simulation model; carrying out a simulation experiment on the composite material plate simulation model by adopting given simulation parameters so as to carry out stress-strain simulation analysis on the composite material plate, and determining a stress-strain curve reflecting the mechanical properties of the composite material plate; and according to the stress-strain curve and the Poisson's ratio, determining a performance index corresponding to the composite material plate. According to the method, mechanical property analysis is performed on the micro-model of the composite material plate, so that the macro-performance of the composite material plate is equivalent, the analysis speed is increased, and the performance analysis cost of the composite material plate is reduced.

Description

Technical Field

[0001] This application relates to the technical field of finite element analysis of mechanical structures, and particularly to a method for analyzing the mechanical properties of volume elements based on composite material plates. Background Art

[0002] Additive manufacturing is a material processing and forming technology that has been widely applied in recent years. It features design flexibility, rapid manufacturing, and economic efficiency. With the continuous development of additive manufacturing technology, its application in the manufacturing of composite material plates has gradually increased.

[0003] In the field of composite materials, the homogenization method is usually used. The material with non-uniform internal small-scale structures is assumed to be a solid material with equal numerical elastic modulus or Poisson's ratio in all directions, and the equivalent mechanical properties characteristics, thereby transforming the composite material into an assumed anisotropic material for analysis.

[0004] However, since the additive manufacturing composite plate has a complex structure at a large scale and small-scale cavities and composite material structures in a lattice-like form at a small scale, when modeling and analyzing, it will face problems such as long time consumption, a large total number of grids, and complex boundary conditions and load relationships. That is to say, the disadvantage of the existing mechanical property analysis process of composite material plates is that the calculation is complex, which reduces the analysis speed and increases the cost of analyzing the properties of composite material plates. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide at least a mechanical property analysis based on composite material plates, by analyzing the mechanical properties of the microscopic model of the composite material plate to equivalently obtain the macroscopic properties of the composite material plate, improve the analysis speed, and reduce the cost of analyzing the properties of the composite material plate.

[0006] This application mainly includes the following aspects:

[0007] In the first aspect, an embodiment of this application provides a method for analyzing the mechanical properties of a composite material plate. The method includes: constructing a microscopic physical model of the composite material plate according to the design data of the composite material plate; performing mesh division on the microscopic physical model of the composite material plate to establish a target composite material plate mesh model, where the target composite material plate mesh model includes a metal part and a non-metal part; connecting the metal part and the non-metal part using a selected contact method to obtain a composite material plate simulation model; performing a simulation experiment on the composite material plate simulation model using given simulation parameters to perform stress-strain simulation analysis on the composite material plate and determine the stress-strain curve reflecting the mechanical properties of the composite material plate; and determining the corresponding performance indicators of the composite material plate according to the stress-strain curve and Poisson's ratio.

[0008] In a possible implementation, a microscopic physical model of a composite material plate is constructed as follows: According to the design data of the composite material plate, a macroscopic physical model of the composite material plate is constructed. The macroscopic physical model of the composite material plate includes a cavity structure layer and a structural column layer from bottom to top. The cavity structure layer includes a cavity array formed by a plurality of cavities, and the structural column layer includes a structural column array formed by a plurality of structural columns. According to the given structural requirements of the microscopic physical model of the composite material plate, the macroscopic physical model of the composite material plate is divided into volume elements to obtain the microscopic physical model of the composite material plate. The center point of the microscopic physical model of the composite material plate is the same as that of the macroscopic physical model of the composite material plate. The given structural requirements limit the minimum number of structural columns and the minimum number of cavities required for the microscopic physical model of the composite material plate.

[0009] In a possible implementation, a grid model of the composite material plate is obtained as follows: The microscopic physical model of the composite material plate is divided into plane grids by using a locally refined grid drawing strategy and plane grid drawing parameters to obtain a processed microscopic physical model of the composite material plate. The processed microscopic physical model of the composite material plate is divided into solid grids according to the solid grid drawing parameters to obtain a to-be-determined grid model of the composite material plate. The quality of the to-be-determined grid model of the composite material plate is verified according to the solid grid verification index. If the to-be-determined grid model of the composite material plate passes the quality verification, the grid model of the composite material plate is determined as the target grid model of the composite material plate.

[0010] In a possible implementation, the selected contact method is to use connection constraints for connection on the upper layer and contact constraints on the lower layer and the side walls. Among them, a simulation model of the composite material plate is obtained as follows: Determine the connection constraints corresponding to the contact method. The connection constraints include tangential connection attribute constraints, normal connection attribute constraints, and geometric property constraints. Create contact events and corresponding contact parameters between the metal surface and the non-metal surface. The contact parameters include the relative sliding mode and the slip tolerance value between the contact surfaces. Determine the contact constraints corresponding to the contact method. Connect the metal part and the non-metal part of the target grid model of the composite material plate according to the contact method, the connection constraints corresponding to the contact method, and the contact constraints to obtain a simulation model of the composite material plate.

[0011] In a possible implementation, the given simulation parameters further include stress analysis steps. The simulation experiment includes a compression simulation experiment. Among them, the stress-strain curve is determined in the following way: Apply pressure to the surface to be compressed through a given load to control the surface to be compressed of the composite material sheet simulation model to be compressed inward by a given distance; During the compression experiment, extract the reaction force on the surface to be compressed according to the stress analysis steps, and calculate the average compressive stress on the surface to be compressed through the reaction force and the cross-sectional area of the surface to be compressed; Use numerical analysis to calculate the elastic modulus value corresponding to each stress analysis step through the displacement corresponding to the surface to be compressed, the total model size in the longitudinal direction, and the average compressive stress; Intercept the effective elastic modulus data before the elastic yield point. The effective elastic modulus data includes the elastic modulus values corresponding to each stress analysis step before the elastic yield point; Use the least squares method to fit the effective elastic modulus data to obtain the first stress-strain curve reflecting the elastic deformation of the composite material sheet.

[0012] In a possible implementation, the simulation experiment includes a shear simulation experiment. Among them, the stress-strain curve is determined in the following way: Determine the shear strain through the quotient of the displacement distance and the height in this direction to obtain the shear modulus; Use the reaction force on the top surface of the metal on the top layer when the top surface of the entire unit thickness direction is displaced as the reaction force when the thickness direction is subjected to transverse shear to determine the shear modulus; Extract the effective shear modulus and use the least squares method to iteratively fit it into the corresponding second stress-strain curve.

[0013] In a possible implementation, the simulation experiment includes a compression simulation experiment and a shear simulation experiment. The stress-strain curve includes the first stress-strain curve determined through the compression simulation experiment and the second stress-strain curve determined through the shear simulation experiment. The performance indicators include the overall elastic modulus of the composite board and the overall effective strength of the composite board. Among them, the performance indicators of the composite board material are determined in the following way: Obtain the effective elastic modulus data obtained from the compression simulation experiment and the effective shear modulus data obtained from the shear simulation experiment; Determine the first calculated elastic modulus and the first calculated effective strength reflecting the mechanical properties of the entire composite board according to the effective elastic modulus data; Determine the second calculated elastic modulus and the second calculated effective strength reflecting the mechanical properties of the entire composite board according to the effective shear modulus data; Determine the average value between the first calculated elastic modulus and the second calculated elastic modulus as the overall elastic modulus of the composite board; Determine the average value between the first calculated effective strength and the second calculated effective strength as the overall effective strength of the composite board.

[0014] Second aspect, an embodiment of the present application further provides a mechanical property analysis device based on a composite material sheet. The device includes: a first construction module for constructing a microscopic physical model of the composite material sheet according to the design data of the composite material sheet; a division module for performing mesh division on the microscopic physical model of the composite material sheet to establish a target composite material sheet mesh model, where the target composite material sheet mesh model includes a metal part and a non-metal part; a connection module for connecting the metal part and the non-metal part by using a selected contact method to obtain a composite material sheet simulation model; a simulation module for performing a simulation experiment on the composite material sheet simulation model by using given simulation parameters to perform stress-strain simulation analysis on the composite material sheet and determine a stress-strain curve reflecting the mechanical properties of the composite material sheet; and an analysis module for determining the performance index corresponding to the composite material sheet according to the stress-strain curve and the Poisson's ratio.

[0015] Third aspect, an embodiment of the present application further provides an electronic device, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device runs, communication is carried out between the processor and the memory through the bus. When the machine-readable instructions are run by the processor, the steps of the mechanical property analysis method based on the composite material sheet in the first aspect or any possible implementation manner in the first aspect are executed.

[0016] Fourth aspect, an embodiment of the present application further provides a computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is run by the processor, the steps of the mechanical property analysis method based on the composite material sheet in the first aspect or any possible implementation manner in the first aspect are executed.

[0017] A mechanical property analysis method based on a composite material sheet provided by an embodiment of the present application includes: constructing a microscopic physical model of the composite material sheet according to the design data of the composite material sheet; performing mesh division on the microscopic physical model of the composite material sheet to establish a target composite material sheet mesh model, where the target composite material sheet mesh model includes a metal part and a non-metal part; connecting the metal part and the non-metal part by using a selected contact method to obtain a composite material sheet simulation model; performing a simulation experiment on the composite material sheet simulation model by using given simulation parameters to perform stress-strain simulation analysis on the composite material sheet and determine a stress-strain curve reflecting the mechanical properties of the composite material sheet; and determining the performance index corresponding to the composite material sheet according to the stress-strain curve and the Poisson's ratio. By performing mechanical property analysis on the microscopic model of the composite material sheet, the macroscopic properties of the composite material sheet are equivalent, the analysis speed is increased, and the cost of analyzing the properties of the composite material sheet is reduced.

[0018] The advantages of the present application are as follows:

[0019] 1. The mechanical property analysis method based on composite material plates provided by this application can establish different composite material plate models according to the requirements of different actual situations during the analysis process, thus meeting the usage needs under different conditions, because the analysis process involves the creation of composite material plate models.

[0020] 2. By analyzing the mechanical properties of the microstructure of the composite material plate, the macroscopic mechanical properties of the composite material plate are equivalent, which improves the analysis speed of the mechanical properties of the composite material plate and reduces the time cost of analyzing the mechanical properties of the composite material plate.

[0021] To make the above objects, features, and advantages of this application more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 Shows the flowchart of a mechanical property gap method for a composite material plate provided by an embodiment of this application;

[0024] Figure 2 Shows a structural design diagram of a composite material plate provided by an embodiment of this application;

[0025] Figure 3 Shows a schematic diagram of a microscopic physical model of a composite material plate provided by an embodiment of this application;

[0026] Figure 4 Shows a schematic diagram of a mesh model of a composite material plate provided by an embodiment of this application;

[0027] Figure 5 Shows a schematic diagram of the overall simulation model of a composite material plate provided by an embodiment of this application;

[0028] Figure 6 Shows a stress-strain property table provided by an embodiment of this application;

[0029] Figure 7 Shows a Poisson's ratio property table generated based on the effective elastic modulus data;

[0030] Figure 8The figure shows a functional module diagram of a mechanical property analysis device for composite material plates provided by an embodiment of the present application;

[0031] Figure 9 The figure shows a schematic structural diagram of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It should be understood that the accompanying drawings in the present application are only for the purpose of illustration and description, and are not used to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to actual scale. The flowcharts used in the present application illustrate operations implemented according to some embodiments of the present application. It should be understood that the operations in the flowchart may not be implemented in sequence, and steps without logical context relationships may be reversed or implemented simultaneously. In addition, those skilled in the art may add one or more other operations to the flowchart or remove one or more operations from the flowchart under the guidance of the content of the present application.

[0033] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and illustrated in the drawings here may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts belong to the protection scope of the present application.

[0034] In the field of composite materials, the homogenization method is usually used to assume that a material with non-uniform internal small-scale structures is a solid material with equal numerical elastic modulus or Poisson's ratio in all directions, and thereby convert the composite material into an assumed anisotropic material for analysis. However, since the additive manufacturing composite plate has a complex structure at a large scale and small-scale cavities and composite material structures in a lattice-like form at a small scale, when modeling and analyzing, problems such as long time consumption, a large total number of grids, and complex boundary conditions and load relationships will be faced. That is to say, the disadvantage of the existing mechanical property analysis process for composite material plates is that the calculation is complex, which reduces the analysis speed and increases the cost of analyzing the properties of composite material plates.

[0035] Based on this, the embodiments of the present application provide a mechanical property analysis based on composite material plates. By performing mechanical property analysis on the microscopic model of the composite material plates, the macroscopic properties of the composite material plates are equivalent, the analysis speed is increased, and the cost of analyzing the properties of the composite material plates is reduced. Specifically as follows:

[0036] Please refer to Figure 1 , Figure 1 which shows a flowchart of a method for mechanical property gaps of a composite material plate provided by an embodiment of the present application. As Figure 1 shown, the method provided by the embodiments of the present application includes the following steps:

[0037] S100. Construct a microscopic physical model of the composite material plate according to the design data of the composite material plate.

[0038] S200. Perform mesh division on the microscopic physical model of the composite material plate to establish a mesh model of the target composite material plate.

[0039] The mesh model of the target composite material plate includes a metal part and a non-metal part.

[0040] S300. Connect the metal part and the non-metal part by using a selected contact method to obtain a simulation model of the composite material plate.

[0041] S400. Perform a simulation experiment on the simulation model of the composite material plate by using given simulation parameters to perform stress-strain simulation analysis on the composite material plate and determine the stress-strain curve reflecting the mechanical properties of the composite material plate.

[0042] S500. Determine the corresponding performance indexes of the composite material plate according to the stress-strain curve and the Poisson's ratio.

[0043] In steps S100 to S500 of the present application, the composite material plate has a double-layer structure, and its upper and lower layers are staggered and arranged, rather than a simple periodic structure. However, for each layer, the various small-scale structures and the design forms of the composite materials corresponding in the transverse direction satisfy the form of a regular array. Therefore, for each layer of the composite material plate, it can be treated as a periodic material respectively, and the mechanical properties in the transverse direction will not change due to the expansion of the plate. The present application creates a corresponding microscopic physical model of the entire composite material plate (a volume element extracted from the entire composite material plate), performs corresponding mechanical property analysis on the microscopic physical model. When the side length of the microscopic physical model reaches a certain size, the corresponding mechanical property analysis result can be equivalent to the mechanical analysis result of the entire composite material plate. And because the volume of the microscopic physical model is relatively small compared to the entire composite material plate, the computational amount of its mechanical analysis is not very large, which greatly improves the mechanical analysis speed and reduces the time cost of performing mechanical analysis on the composite material plate.

[0044] Please refer to Figure 2 , Figure 2 which shows a structural design diagram of a composite material plate provided by an embodiment of the present application. As Figure 2 , the design data of the composite material plate is given. The design data of the composite material plate includes the height a of the lower layer of the plate = 29 mm, the height b of the structural column corresponding to the upper layer of the plate = 36 mm, the thickness c of the top plate corresponding to the upper layer of the plate = 1 mm, the height d of the cavity corresponding to the lower layer of the plate = 10 mm, the cavity interval e of the lower layer of the plate = 3 mm (the upper and lower intervals and the left and right intervals of the cavity), the thickness f of the top plate of the lower layer of the plate = 4 mm, the thickness g of the bottom plate of the lower layer of the plate = 2 mm, the number of cavities in the lower layer of the plate (not shown in the figure, including the number of cavities on the long side and the short side of the plate) and the number of structural columns in the upper layer of the plate (not shown in the figure, including the number of structural columns on the long side and the short side of the plate).

[0045] In a preferred embodiment, step S100 includes:

[0046] S1001. Construct a macroscopic physical model of the composite material plate according to the design data of the composite material plate.

[0047] The macroscopic physical model of the composite material plate includes a cavity structure layer and a structural column layer from bottom to top. The cavity structure layer includes a cavity array formed by a plurality of cavities, and the structural column layer includes a structural column array formed by a plurality of structural columns.

[0048] S1002. Perform volume element segmentation on the macroscopic physical model of the composite material plate according to the given structural requirements of the microscopic physical model of the composite material plate to obtain the microscopic physical model of the composite material plate.

[0049] The center point of the microscopic physical model of the composite material plate is the same as that of the macroscopic physical model of the composite material plate, and the given structural requirements limit the minimum number of structural columns and the minimum number of cavities required for the microscopic physical model of the composite material plate.

[0050] In step S1001, as Figure 2As shown, according to the number of long-side cavities in the lower layer of the plate, the height of the corresponding bottom cavity in the lower layer of the plate, and the cavity interval corresponding to the lower layer of the plate, the outermost side length dimensions of the macroscopic physical model of the composite material plate can be calculated (including the outermost long-side dimension and the outermost wide-side dimension of the bottom plate in the lower layer of the plate). For example, if the number of long-side cavities in the plate = 36, then when the height of the corresponding bottom cavity in the lower layer of the plate = 10 mm and the cavity interval e = 3 mm, the outermost long-side dimension L1 = 36×10 + 37×3 = 471 mm. Similarly, according to the number of wide-side cavities in the lower layer of the plate, the height of the corresponding bottom cavity in the lower layer of the plate, and the cavity interval corresponding to the lower layer of the plate, the outermost wide-side dimension L2 of the macroscopic physical model of the composite material plate can be calculated. Among them, there is a case where the outermost long-side dimension L1 is equal to the outermost wide-side dimension L2. At this time, the bottom plate in the lower layer of the plate is a square bottom plate.

[0051] Take Figure 2 Taking the creation of the macroscopic physical model of the composite material plate as an example, using UG modeling software, according to the side lengths (L1 and L2) of the bottom plate in the lower layer of the plate, create a plane sketch of the bottom plate in the lower layer of the plate. In this application, the number of long-side cavities in the lower layer of the plate is set to be equal to the number of wide-side cavities in the lower layer of the plate, and L1 = L2 is obtained, that is, the plane sketch of the bottom plate in the lower layer of the plate is a square. First, stretch the plane sketch of the bottom plate in the lower layer of the plate, and the stretching distance = according to the thickness g of the bottom plate in the lower layer of the plate + 2×cavity height d + cavity interval e, to obtain a to-be-processed cube for generating the cavity structure layer. The design data of the composite material plate also includes the cavity side length w of the lower layer of the plate.

[0052] Draw a cavity plane sketch on the top plane of the to-be-processed cube according to the cavity side length w, where w = 10 mm, the cavity plane sketch is a square, and the interval between the cavity plane sketch and the edge of the top plane of the to-be-processed cube is one cavity interval e. Stretch the cavity plane sketch downward, and the stretching height is the cavity height d = 10 mm to obtain a cube cavity. Set the top corners of the cube cavity to be rounded. Based on this cube cavity, the number of cavities corresponding to the short side or long side of the lower layer of the plate, and the cavity interval (the upper and lower cavity intervals = the left and right cavity intervals), generate a cube cavity array in the to-be-processed cube. Among them, the cavities corresponding to the cube cavity array fill the entire space in the to-be-processed cube. Determine the to-be-processed cube with the cube cavity array as the cavity structure layer corresponding to the lower layer of the plate.

[0053] Preferably, after generating the cavity structure layer, a sketch of the top surface of the cavity structure layer is drawn on the top surface of the cavity structure layer, and the sketch of the top surface of the cavity structure layer is stretched upward. The stretching distance = the thickness f of the lower layer roof plate of the plate + the height of the structural column + the height b of the corresponding structural column of the upper layer of the plate. After the stretching is completed, a to-be-processed cube of the upper layer of the plate is formed. A sketch of the bottom surface of the structural column is drawn on the top plane of the to-be-processed cube of the upper layer of the plate according to the bottom surface size of the structural column. The edge of the sketch of the bottom surface of the structural column is staggered 0.1 mm from the top edge of the to-be-processed cube of the upper layer of the plate. Then, according to the height b of the structural column, the center spacing of the structural columns, and the outermost side length, in the same manner as generating the cavity array, a structural column array covering the to-be-processed cubes of the upper layer is formed. Long strip-shaped cavities will be formed between the structural column arrays. The to-be-processed cube with a cube cavity array formed is determined as the corresponding structural column layer of the upper layer of the plate.

[0054] Finally, a square sketch is drawn on the upper surface of the structural column layer. The size of the square sketch is the same as the size of the corresponding roof plate of the upper layer of the plate given in the composite material plate structure design drawing. The square sketch is stretched according to the thickness c of the corresponding roof plate of the upper layer of the plate to form a top encapsulation. From top to bottom, the top encapsulation, the structural column layer, and the cavity structure layer are arranged to form a macroscopic physical model of the composite material plate.

[0055] In step S1002, after obtaining the macroscopic physical model of the composite material plate, according to the given structural requirements of the microscopic physical model of the composite material plate, volume element segmentation is performed from the center point of the macroscopic physical model of the composite material plate, ensuring that the cavities or structural columns included in the cut-out microscopic physical model of the composite material plate have more than 1 / 4 of the part, so as to avoid the problem of large local deformation, which further affects the extraction of the Poisson's ratio.

[0056] Please refer to Figure 3 , Figure 3 which shows a schematic diagram of a microscopic physical model of a composite material plate provided by an embodiment of the present application. As Figure 3 shown, assuming that the given structural requirements of the microscopic physical model of the composite material plate indicate that the minimum side length of the microscopic physical model of the composite material plate is 100 mm, in order to ensure that the number of each transverse structural column, the cavities in the cavity structure layer, and the long strip-shaped cavities formed between the structural columns in the microscopic physical model of the composite material plate each meet the minimum number requirements, it is determined that in the microscopic physical model of the composite material plate, there are at least 4 structural columns, at least 7 cavities in the cavity structure layer, and at least 2 long strip-shaped cavities.

[0057] In this application, when slicing the macroscopic physical model of the composite material plate, it is not ensured that each cavity is wrapped by metal. This is because shear failure often occurs in the middle section of the cavity or at the cavity fillet. If the slice is made at these positions during slicing, the effective modulus obtained in subsequent calculations will be too small, closer to the minimum modulus component of the structure's local part, making it easier to reveal the hidden dangers in the design of the composite material plate in the final calculation results.

[0058] In a preferred embodiment, step S200 includes:

[0059] Using a locally refined grid drawing strategy and planar grid drawing parameters to perform planar grid division on the microscopic physical model of the composite material plate, obtaining the processed microscopic physical model of the composite material plate, performing three-dimensional grid division on the processed microscopic physical model of the composite material plate according to the three-dimensional grid drawing parameters, obtaining a to-be-determined grid model of the composite material plate, performing quality verification on the to-be-determined grid model of the composite material plate according to the three-dimensional grid verification index. If the to-be-determined grid model of the composite material plate passes the verification, then the grid model of the composite material plate is determined as the target grid model of the composite material plate.

[0060] The planar grid drawing parameters include, but are not limited to, at least one of the following items: planar grid element size, growth rate, minimum size, and maximum characteristic angle. Among them, the planar grid element size can be selected as an appropriate size after performing grid independence analysis according to requirements. The three-dimensional grid drawing parameters include the maximum size of the three-dimensional grid element.

[0061] In a specific embodiment, the microscopic physical model of the composite material plate is imported into the Hypermesh software, and then the given planar grid drawing parameters are set. For example, the planar grid element size corresponding to the planar grid drawing parameters is set to 5 mm, the growth rate is set to 1.2, the minimum size is set to 0.2 mm, and the maximum characteristic angle is set to 30°. Further, after determining the planar grid drawing parameters, through the planar grid division function provided by the Hypermesh software, the surface deviation method is used to perform surface grid drawing on the microscopic physical model of the composite material plate, obtaining the processed microscopic physical model of the composite material plate.

[0062] After obtaining the processed microscopic physical model of the composite material plate, the processed microscopic physical model of the composite material plate is smoothed through the planar grid smoothing function provided by the Hypermesh software to optimize the processed microscopic physical model of the composite material plate again, obtaining the optimized microscopic physical model of the composite material plate.

[0063] Further, set the maximum size of the three-dimensional grid unit to 5 mm. Using the tetrahedral mesh generation function provided by Hypermesh software, draw a volume mesh for the optimized microscopic physical model of the composite material plate in the form of a terrain mesh to obtain a to-be-determined mesh model of the composite material plate.

[0064] Verify the mesh quality of the to-be-determined mesh model of the composite material plate. First, determine the three-dimensional grid verification index and set the corresponding index threshold. The three-dimensional grid verification index includes at least one of the following items: Jacobian, aspect ratio, and distortion. For example, if the three-dimensional grid verification index is distortion, its corresponding maximum value is 0.85. That is, once the distortion corresponding to the to-be-determined mesh model of the composite material plate is greater than 0.85, it is determined that the quality verification of the to-be-determined mesh model of the composite material plate fails and the three-dimensional grid division needs to be redone, such as changing the mesh division method. If the distortion corresponding to the to-be-determined mesh model of the composite material plate is less than or equal to 0.85, it is determined that the to-be-determined mesh model of the composite material plate passes the quality verification, and the to-be-determined mesh model of the composite material plate is directly determined as the target mesh model of the composite material plate. Export the target mesh model of the composite material plate as an inp.-type mesh file for subsequent import and use in calculations.

[0065] In a preferred embodiment, before meshing the microscopic physical model of the composite material plate, according to the material requirements provided by the composite material plate design data, corresponding material properties can be assigned to different parts of the microscopic physical model of the composite material plate. In this application, it is mainly divided into metal materials and non-metal materials. After assigning corresponding material properties to different structures of the microscopic physical model of the composite material plate, the microscopic physical model of the composite material plate can be divided into a metal part using metal materials and a non-metal part using non-metal materials.

[0066] In the process of creating the microscopic physical model of the material plate in this application, the number, type, and properties (such as material properties) of the structures forming the composite plate can be changed according to the actual requirements of the plate, which can improve the flexibility of stress analysis for different composite plates.

[0067] In a specific embodiment, that is, in this application, if the structures in the microscopic physical model of the composite material plate are classified according to material type, the microscopic physical model of the composite material plate includes a metal part and a non-metal part. In a specific embodiment, the requirement for the composite material plate in this application is that the structure body uses ceramic materials, and the structures other than the structure body use metal materials, such as carbon steel. Specifically, taking this embodiment as an example, this application determines the material properties of each part of the microscopic physical model of the composite material plate through the following method:

[0068] Import the microscopic physical model of the composite material plate into the finite element software Abaqus for engineering simulation. Then, using the material creation function provided by Abaqus, create various plates according to the actual material design of the microscopic physical model of the composite material plate. Taking the creation of the metal material carbon steel as an example, use the material creation function provided by Abaqus to create the carbon steel material and set the density of the carbon steel to 7.8×10 -9 t / cm 3 , set the Young's modulus to 210000, the Poisson's ratio to 0.3, the yield strength to 380 MPa, the tensile strength to 530 MPa, and the corresponding strain rate to 0.35.

[0069] Similarly, create the ceramic material. The corresponding density of the ceramic material is set to 2.52×10 -9 t / cm 3 , the Young's modulus is 450000, and the Poisson's ratio is 0.18.

[0070] After the material settings are completed, assign the two materials to the corresponding regional modules of the microscopic physical model of the composite material plate according to the requirements. Specifically, select the first cross-section corresponding to the structural column in the microscopic physical model of the composite material plate and modify its cross-sectional material property to the ceramic material to transform the structural column into a ceramic column. Select the second cross-section other than the structural column in the microscopic physical model of the composite material plate and modify its cross-sectional material property to carbon steel. In this way, the metal part and the non-metal part of the microscopic physical model of the composite material plate can be obtained. In this application, further, after the metal part and the non-metal part are set, use the assembly module provided by Abaqus to set the associated tags for the corresponding regions of the metal part and the non-metal part that have contact or connection relationships. After the setting is completed, corresponding constraints are formed between the associated metal part and non-metal part. The main purpose of the constraint is to make the contacting parts form an analysis whole, which is more convenient for subsequent stress analysis. It is also necessary to cancel the edge nodes connecting the metal part (carbon steel part, specifically referring to the upper surface of the ceramic column and the metal part) and the non-metal part (ceramic part) to avoid over-constraint problems when performing contact constraints or connection constraints between the metal part and the non-metal part in the future, such as the technical problem of non-convergence of the calculation results caused by over-constraint.

[0071] In addition, it is also necessary to determine the force application position for subsequent stress analysis. The force application position is determined according to the volume of the microscopic physical model of the composite material plate. The larger the volume of the microscopic physical model of the composite material plate, the larger the coordinate value of the force application position.

[0072] For the microphysical model of a composite material sheet for which the material properties have been assigned, the metal part and the non-metal part can be displayed in different colors. For example, the metal part is displayed in yellow and the non-metal part is displayed in blue. For the microphysical model of a composite material sheet for which the material properties have been assigned, when performing mesh division through step S200, the mesh division can be performed separately for the metal part and the non-metal part, and the division methods are the same. Please refer to Figure 4 , Figure 4 which shows a schematic diagram of a mesh model of a composite material sheet provided by an embodiment of the present application. As Figure 4 shown, the yellow color represents the network model corresponding to the metal part in the microphysical model of the composite material sheet, and the blue part represents the network model corresponding to the non-metal part in the microphysical model of the composite material sheet.

[0073] In a preferred embodiment, step S300 includes:

[0074] Determine the connection constraints corresponding to the contact method. The connection constraints include tangential connection property constraints, normal connection property constraints, and geometric property constraints. Create the contact matters between the metal surface and the non-metal surface. The given contact parameters include the relative sliding method and the slip tolerance value between the contact surfaces. Determine the contact constraints corresponding to the contact method. Connect the metal part and the non-metal part of the target composite material sheet mesh model according to the contact method, the connection constraints corresponding to the contact method, and the contact constraints to obtain the composite material sheet simulation model.

[0075] The contact methods between the metal part and the non-metal part provided in the present application include:

[0076] The first contact method is to completely connect the fitting places together using the connection constraints. Its calculation method is relatively easy to converge. However, due to the actual processing situation that after the cavity structure layer (metal material) is manufactured, the structural column (ceramic column) is installed on the top of the cavity structure layer and then the molten metal is filled. Therefore, there is no molecular-level connection between the bottom of the structural column and the top of the cavity structure layer, that is, the bottom of the structural column and the top of the cavity structure layer are not welded together. Therefore, it is not reasonable to completely connect the fitting places together using the connection constraints. The deformation of the composite sheet is much smaller than that during the solution of the contact when performing subsequent stress calculations, and the complex changes of the ceramic column inside the metal cannot be simulated.

[0077] The second contact method is to completely adopt contact connection. The advantage of this contact method for subsequent stress analysis is that it can simulate the mechanical properties of the composite plate when the connection between the cladding metal and the ceramic column is not strong, and simulate the irregular deformation and displacement of the ceramic column inside the metal cavity when the composite plate is loaded. However, this calculation method's contact method is extremely difficult to converge in subsequent calculations, and the deformation of each ceramic column is uncontrollable. Therefore, it is also difficult to extract the Poisson's ratio obtained from the final calculation.

[0078] The third contact method is to connect the upper surface and the side wall of the structural column using connection constraints, and use contact constraints for the lower surface of the structural column. The connection constraint means that the motion relationship can be transmitted between the two, and the contact constraint means that the force needs to be transmitted through the common surface between the two. Its effect on subsequent stress analysis is similar to that of the first contact method, and will not be elaborated here.

[0079] The fourth contact method is to connect the upper surface of the structural column and the metal part it contacts using connection constraints, and use contact constraints for the metal part in contact with the lower surface of the structural column and the metal part in contact with the side wall of the structural column. This contact method can simulate the irregular deformation and displacement of the internal ceramic column to a certain extent in subsequent simulation calculations while ensuring that the deformation is not too large, so that the deformation of the ceramic column is constrained by the top cladding metal to a certain extent, and this place is also relatively easy to converge, and the calculation speed is acceptable. The disadvantage is that the displacement of the outer ceramic column will be larger than that of the metal during compression, and certain data processing needs to be done.

[0080] The selected contact method in this application is the fourth contact method, that is, the upper layer is connected using connection constraints, and contact constraints are used for the lower layer and the side wall.

[0081] In a specific embodiment, the connection constraint can be specifically set as follows: the friction coefficient in the tangential connection attribute is set to 0.1, the normal connection attribute is set to hard contact, and then geometric characteristics, such as element type, are added.

[0082] During the process of creating the contact matters and corresponding contact parameters between the metal surface and the non-metal surface, the contact parameters can be set as follows: the relative sliding mode is set to small slip, and the slip tolerance value is set to 0.2.

[0083] Then create contact constraints. Specifically, select the cladding metal surface, then click to select the cladding ceramic surface, click to select surface-to-surface contact, set the allowable distance between the contact surfaces to 1 unit distance (the unit distance is given in advance, such as mm), and click OK.

[0084] Preferably, in step S400, it includes:

[0085] According to the material properties corresponding to the metal part and the non-metal part, set the material properties corresponding to the metal part and the non-metal part. The material properties include, but are not limited to, at least one of the following items: elastic modulus, Poisson's ratio. Set the boundary conditions, which include, but are not limited to, at least one of the following items: load conditions and constraint conditions. Determine whether the metal part and the non-metal part are brittle materials respectively. If they are brittle materials, do not set plasticity. Otherwise, plasticity needs to be set.

[0086] In this application, to establish the stress-strain curve corresponding to the composite material plate simulation model, static analysis needs to be performed on the composite material plate simulation model. The static analysis is carried out through mechanical property simulation experiments. The mechanical property simulation experiments include compressive force simulation experiments and shear simulation experiments. Before performing the mechanical property simulation experiments, first set the simulation parameters, which include stress analysis step and load. First, determine that the initial stress analysis step is set to 0.1 (to prevent plastic changes). The analysis step refers to clicking to create historical output, and the historical output is used to describe the change of the monitored variable over time. In this application, the monitored variables are the displacement U generated by the force application point in the force application direction and the reaction force R.

[0087] Please refer to Figure 5 , Figure 5 shows an overall schematic diagram of a composite material plate simulation model provided by an embodiment of this application. The setting of the load is completed through the load module provided by the Abaqus software. Specifically, create a load according to the load application direction. For example, the composite material plate simulation model A is in the coordinate system as shown in Figure 5 . Combining with the load application direction, define the left side of A as Xbottom, the right side of A as Xtop, the bottom surface of A as Ybottom, the top surface of A as Ytop, the front surface of A as Zbottom, and the back surface of A as Ztop respectively.

[0088] Taking the load application direction as the negative direction of the coordinate axis as an example, create a load applied along the negative X direction and name it X-back, and set the initial stress analysis step corresponding to the load X-back and the load acting surface Xtop (indicating the load bearing surface). The degree of freedom is selected as U-x, indicating that the load acting surface Xtop is movable along the negative X direction. If the degree of freedom is selected as Ux, it means that the load acting surface Xtop is movable along the positive X direction.

[0089] Similarly, set the Y-direction load Y-back and the Z-direction load Z-back respectively.

[0090] For the compression simulation experiment, a model for the compression simulation experiment needs to be built based on the loads X-back, Y-back, and Z-back, including:

[0091] After the load is created, three simulation models of composite material plates are copied. The set loads X-back, Y-back, and Z-back are respectively associated with the three simulation models of composite material plates, and the simulation models Xtens, Ytens, and Ztens of composite material plates for compression simulation experiments are obtained. Then, compression simulation experiments are respectively performed based on Xtens, Ytens, and Ztens.

[0092] It should be noted that before performing the compression simulation experiment, it is also necessary to define the monitoring variables corresponding to Xtens, Ytens, and Ztens to complete all parameter settings before performing the compression experiment.

[0093] Taking the setting of the monitoring variables corresponding to the simulation model Xtens of the composite material plate as an example, the corresponding monitoring variables are defined as the reaction force RF1 applied to the reaction surface Xtop of the load X-back and the displacement U1 of the reaction surface Xtop of the load X-back.

[0094] Similarly, taking the reaction surface Ytop of the load Y-back and the reaction surface Ztop of the load Z-back as examples, the monitoring variables RF2, U2 corresponding to Ytens and the monitoring variables RF3, U3 corresponding to Ztens can be respectively set, which will not be elaborated here.

[0095] In another preferred embodiment, for the shear simulation experiment, a model for the shear simulation experiment needs to be built based on the loads X-back, Y-back, and Z-back, including:

[0096] After the load is created, three simulation models of composite material plates are copied. The set loads X-back, Y-back, and Z-back are respectively associated with the three simulation models of composite material plates, and the simulation model ZXshear of the composite material plate corresponding to the load X-back, the simulation model XYshear of the composite material plate corresponding to the load Y-back, and YZshear corresponding to the load Z-back are obtained. Then, compression simulation experiments are respectively performed based on XYshear, YZshear, and ZXshear.

[0097] Among them, ZXshear means that the degree of freedom in the Z direction of the model is fixed, the degree of freedom in the X direction is not restricted, the reaction surface Xtop indicated by the load X-back corresponding to ZXshear, and the reaction force and displacement acting on Xtop that need to be monitored are set.

[0098] Similarly, XYshear means that the degree of freedom in the X direction of the model is fixed, the degree of freedom in the Y direction is not restricted, YZshear means that the degree of freedom in the Y direction of the model is fixed, the degree of freedom in the Z direction is not restricted, and the corresponding monitoring objects (including reaction force and displacement) are also set.

[0099] Taking XYshear as an example, when making specific settings for it, the degrees of freedom in the XYZ three directions of the three surfaces other than the corresponding acting surfaces of the loads X-back, Y-back, and Z-back are all fixed, namely Xbottom, Ybottom, and Zbottom, and the degrees of freedom of Xtop, Ytop, and Ztop are U-y, that is, Xtop, Ytop, and Ztop are allowed to move in the negative direction of Y.

[0100] Similarly, set ZXshear and YZshear, which will not be elaborated here.

[0101] Create each task, set the memory, CPU, and GPU according to the computer conditions, and start the simulation calculation after the settings are completed.

[0102] The simulation parameters include but are not limited to at least one of the following items: the material properties and boundary conditions corresponding to the materials used for the metal part and the non-metal part of the composite material plate grid model. Among them, the material properties include but are not limited to at least one of the following items: elastic modulus and Poisson's ratio.

[0103] In a preferred embodiment, the given simulation parameters further include stress analysis steps. The simulation experiment includes a compression simulation experiment. The stress-strain curve includes the first stress-strain. Step S400 further includes:

[0104] Apply pressure to the surface to be compressed through the given load to control the surface to be compressed of the composite material plate simulation model to be compressed inward by a given distance. During the compression experiment, extract the reaction force on the surface to be compressed (i.e., the load acting surface) according to the stress analysis step, and calculate the average compressive stress on the surface to be compressed through the reaction force and the cross-sectional area of the surface to be compressed. Use numerical analysis to calculate the elastic modulus value corresponding to each stress analysis step through the displacement corresponding to the surface to be compressed, the total size of the longitudinal model, and the average compressive stress. Intercept the effective elastic modulus data before the elastic yield point. The effective elastic modulus data includes the elastic modulus values corresponding to each stress analysis step before the elastic yield point. Use the least squares method to fit the effective elastic modulus data to obtain the first stress-strain curve reflecting the elastic deformation of the composite material plate.

[0105] In a specific implementation, in the compression simulation test, the given compression distance is 1mm. Control the surface to be compressed to be compressed 1mm in the direction indicated by the load inward, and extract the reaction force acting on the surface to be compressed. Calculate the average compressive stress on the surface to be compressed through the reaction force acting on the surface to be compressed and the cross-sectional area of the surface to be compressed. Calculate the compressive strain through the given compression distance and the total size of the composite material plate simulation model in the compression direction. Thereby, divide the average compressive stress by the compressive strain to obtain the elastic modulus value.

[0106] Due to the use of numerical calculation, the elastic modulus values obtained by separate calculation for each stress analysis step are not the same. Moreover, as the composite material sheet simulation model is compressed inward, the deformation of the composite material sheet simulation model gradually transforms from elastic deformation to plastic deformation, and the calculated modulus will gradually decrease accordingly. Therefore, the effective elastic modulus data corresponding to the yield point is extracted from the elastic modulus values, and the effective elastic modulus data is fitted into the corresponding first stress-strain curve using the least squares method.

[0107] In another preferred embodiment, the compression simulation test can also extract the Poisson's ratio of the composite material sheet simulation model during deformation in the compression direction. In addition to the given compression distance corresponding to the surface to be compressed that has been determined, and the surface with all degrees of freedom fixed in all directions, it is also necessary to extract the displacements of other surfaces with the same degrees of freedom as the surface to be compressed except the surface to be compressed to obtain the average displacement in the transverse direction.

[0108] After obtaining the average displacement, the stress data indicated by each stress analysis step in the elastic stage is fitted using the least squares method, and the slope of the obtained curve is the Poisson's ratio in this direction.

[0109] In another preferred embodiment, step S400 further includes:

[0110] The shear strain is determined by the quotient of the displacement distance and the height in this direction to obtain the shear modulus;

[0111] Taking the reaction force of the top metal surface at the top surface displacement in the entire unit thickness direction as the reaction force during transverse shear in the thickness direction, the shear modulus is determined, the effective shear modulus is extracted and iteratively fitted into the corresponding second stress-strain curve using the least squares method.

[0112] In a preferred embodiment, the basic logic of the shear simulation test is to simulate a 1-mm displacement on the cut surface of the composite material sheet simulation model, thereby obtaining the reaction force corresponding to the cut surface to calculate the shear modulus.

[0113] For XY shear (which refers to the shear moving along the Y direction perpendicular to the X direction) and YZ shear (which refers to the shear moving along the X direction perpendicular to the Y direction), their acting positions are on the cut surface of the composite material sheet simulation model. Therefore, their acting area is the cut surface area in this direction, and their shear strain is the quotient of the displacement distance and the height in this direction, and the final shear modulus is calculated accordingly.

[0114] Since the dimensional difference between the actual thickness direction of the sheet material (such as the top plate and the tail plate) and the actual length and width directions is more than one order of magnitude, the shear performance of the cross-section in the thickness direction is not calculated. Instead, the reaction force of the top metal surface when the displacement of the top surface in the thickness direction of the entire unit is 1 mm is used as the reaction force when subjected to transverse shear in the thickness direction, and the shear modulus is obtained therefrom. The final obtained iteration steps are also fitted into the second stress-strain curve of the elastic deformation section by the least squares method, and then the effective shear modulus is extracted.

[0115] In a preferred embodiment, the performance indicators include the overall elastic modulus of the composite sheet and the overall effective strength of the composite sheet. Step S500 includes:

[0116] Obtain the effective elastic modulus data obtained from the compression simulation experiment and the effective shear modulus data obtained from the shear simulation experiment. Determine the first calculated elastic modulus and the first calculated effective strength reflecting the mechanical properties of the entire composite sheet according to the effective elastic modulus data, and determine the second calculated elastic modulus and the second calculated effective strength reflecting the mechanical properties of the entire composite sheet according to the effective shear modulus data. Determine the mean value between the first calculated elastic modulus and the second calculated elastic modulus as the overall elastic modulus of the composite sheet, and determine the mean value between the first calculated effective strength and the second calculated effective strength as the overall effective strength of the composite sheet.

[0117] During the analysis process, the ceramic columns on the cross-section of the composite material sheet simulation model show warping, and the displacement of the ceramic columns is larger than that of the metal section. When collecting the simulation experiment data, the metal part is used as the standard.

[0118] In a specific embodiment, the effective elastic modulus data obtained from the compression simulation experiment and the effective shear modulus data obtained from the shear simulation experiment are made into corresponding performance tables.

[0119] Please refer to Figure 6 , Figure 6 which shows a stress-strain performance table provided by an embodiment of the present application. As shown in the Figure 6 table, when extracting the compression performance, taking the composite material sheet simulation model type as Xtens as an example, its corresponding composite material sheet simulation model length is 130 mm (millimeters), the composite material sheet simulation model width is 57 mm, and the composite material sheet simulation model height is 130 mm. Compression experiments are carried out on the compression surface corresponding to Xtens by applying a given load to obtain the reaction force RF on the compression surface, the displacement U corresponding to the compression surface, the concentrated force FORCE applied to the compression surface, as well as the corresponding strain STRAIN, stress STRESS, and elastic modulus MODULUS (effective elastic modulus) at different times, and the first calculated elastic modulus and the first calculated effective strength obtained by calculation.

[0120] Please refer to Figure 7 ,Figure 7 shows a Poisson's ratio performance table generated based on effective elastic modulus data. As Figure 7 shown in the table, when extracting the compression performance, taking the composite material plate simulation model type Xtens as an example, the corresponding length of the composite material plate simulation model is 130 mm (millimeters), the width of the composite material plate simulation model is 57 mm, and the height of the composite material plate simulation model is 130 mm. By applying a given load to the compression surface corresponding to Xtens for compression experiments, the corresponding displacements UH along the height direction of Xtens, UL along the length L direction of Xtens, UW along the width W direction of Xtens, longitudinal strain Elongitudinal, transverse strain Etransverse, and Poisson's ratio at different times are obtained, as well as the processed Poisson's ratio = 0.477617276 calculated.

[0121] Similarly, a shear test generates a performance table identical to the above.

[0122] Based on the same inventive concept, an apparatus for analyzing the mechanical properties of a composite material plate corresponding to the method for analyzing the mechanical properties of a composite material plate provided in the above embodiments is further provided in the embodiments of the present application. Since the principle of solving problems by the apparatus in the embodiments of the present application is similar to the method for analyzing the mechanical properties of a composite material plate in the above embodiments of the present application, the implementation of the apparatus can refer to the implementation of the method, and the repeated parts will not be described again.

[0123] Please refer to Figure 8 , Figure 8 which shows a functional module diagram of an apparatus for analyzing the mechanical properties of a composite material plate provided in an embodiment of the present application. As Figure 8 shown, the apparatus includes:

[0124] A first construction module 600, configured to construct a microscopic physical model of a composite material plate according to the design data of the composite material plate;

[0125] A partitioning module 610, configured to perform mesh partitioning on the microscopic physical model of the composite material plate to establish a target composite material plate mesh model, where the target composite material plate mesh model includes a metal part and a non-metal part;

[0126] A connection module 620, configured to connect the metal part and the non-metal part by using a selected contact method to obtain a composite material plate simulation model;

[0127] A simulation module 630, configured to perform a simulation experiment on the composite material plate simulation model by using given simulation parameters to perform stress-strain simulation analysis on the composite material plate and determine a stress-strain curve reflecting the mechanical properties of the composite material plate;

[0128] An analysis module 640, configured to determine performance indicators corresponding to the composite material sheet according to the stress-strain curve and the Poisson's ratio.

[0129] Based on the same application concept, please refer to Figure 9 , Figure 9 which shows a schematic structural diagram of an electronic device provided by an embodiment of the present application. As Figure 7 shown, the electronic device 700 includes: a processor 710, a memory 720, and a bus 730. The memory 720 stores machine-readable instructions executable by the processor 710. When the electronic device 700 runs, communication is carried out between the processor 710 and the memory 720 through the bus 730. When the machine-readable instructions are run by the processor 710, the steps of the mechanical property analysis method based on the composite material sheet provided in any one of the above embodiments are executed.

[0130] Based on the same application concept, an embodiment of the present application further provides a computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is run by a processor, the steps of the mechanical property analysis method based on the composite material sheet provided in the above embodiment are executed.

[0131] Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems and devices described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein. In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some communication interfaces. The indirect coupling or communication connection of the devices or units can be in an electrical, mechanical, or other form.

[0132] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0133] In addition, in each embodiment of the present application, the functional units can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.

[0134] When the above-mentioned functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0135] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A mechanical properties analysis method based on composite material plates, characterized in that: The method comprises: According to the design data of composite material plate, a microscopic physical model of composite material plate is constructed; Meshing the microscopic physical model of the composite material plate to establish a target composite material plate mesh model, wherein the target composite material plate mesh model includes a metal part and a non-metal part; The metal part and the non-metal part are connected by using a selected contact method to obtain a simulation model of the composite material plate; Using given simulation parameters to conduct a simulation experiment on the composite material plate simulation model to perform stress-strain simulation analysis on the composite material plate and determine a stress-strain curve reflecting the mechanical properties of the composite material plate; According to the stress-strain curve and Poisson's ratio, the performance index corresponding to the composite material plate is determined.

2. The method according to claim 1, characterized in that The microscopic physical model of the composite material plate is constructed by: According to the composite material plate design data, a macroscopic physical model of the composite material plate is constructed, wherein the macroscopic physical model of the composite material plate includes, from bottom to top, a cavity structure layer and a structural column layer, wherein the cavity structure layer includes a cavity array formed by a plurality of cavities, and the structural column layer includes a structural column array formed by a plurality of structural columns; According to the given structural requirements of the microscopic physical model of the composite material plate, the macroscopic physical model of the composite material plate is divided into volume elements to obtain the microscopic physical model of the composite material plate. The center point of the microscopic physical model of the composite material plate is the same as the macroscopic physical model of the composite material plate. The given structural requirements limit the minimum number of structural columns and the minimum number of cavities that the microscopic physical model of the composite material plate needs to include.

3. The method according to claim 1, characterized in that The mesh model of the composite material plate is obtained by: Using a local encrypted grid drawing strategy and plane grid drawing parameters to perform plane grid division on the microscopic physical model of the composite material plate to obtain a processed microscopic physical model of the composite material plate; According to the three-dimensional grid drawing parameters, the processed composite material plate microscopic physical model is divided into three-dimensional grids to obtain a grid model of the composite material plate to be determined; Performing quality verification on the grid model of the composite material plate to be determined according to the three-dimensional grid verification index; If the undetermined composite material plate mesh model passes the quality verification, the composite material plate mesh model is determined as the target composite material plate mesh model.

4. The method according to claim 1, characterized in that: The selected contact method is to use connection constraints for the upper layer and contact constraints for the lower layer and side walls. Among them, the simulation model of the composite material plate is obtained by the following method: Determine the connection constraints corresponding to the contact mode, which include tangential connection attribute constraints, normal connection attribute constraints and geometric property constraints; Create contact items and corresponding contact parameters between metal surfaces and non-metal surfaces. The contact parameters include the relative sliding mode and sliding tolerance between the contact surfaces. Determine the contact constraints corresponding to the contact mode; The metal part and the non-metal part of the target composite material plate mesh model are connected according to the contact mode, the connection constraint corresponding to the contact mode and the contact constraint to obtain the composite material plate simulation model.

5. The method according to claim 1, characterized in that The given simulation parameters also include a stress analysis step, and the simulation experiment includes a compression simulation experiment. Wherein, the stress-strain curve is determined by the following method: Applying pressure to the surface to be compressed by a given load to control the surface to be compressed corresponding to the composite material plate simulation model to be compressed inward by a given distance; During the compression test, the support reaction force on the surface to be compressed is extracted according to the stress analysis step, and the average compressive stress on the surface to be compressed is calculated by the support reaction force and the cross-sectional area of ​​the surface to be compressed; By adopting numerical analysis, the elastic modulus value corresponding to each stress analysis step is calculated through the corresponding displacement of the surface to be compressed, the total longitudinal size of the model and the average compressive stress; The effective elastic modulus data before the elastic yield point is intercepted, and the effective elastic modulus data includes the elastic modulus value corresponding to each stress analysis step before the elastic yield point; The effective elastic modulus data are fitted using the least square method to obtain a first stress-strain curve of elastic deformation of the reaction composite material plate.

6. The method according to claim 1, characterized in that The simulation experiment includes a shear simulation experiment. Wherein, the stress-strain curve is determined by the following method: The shear strain is determined by the quotient of the displacement distance and the height in that direction, and the shear modulus is obtained; The shear modulus is determined by taking the support reaction force of the top metal surface when the top surface of the entire unit is displaced in the thickness direction as the reaction force when subjected to transverse shear in the thickness direction; The effective shear modulus was extracted and iteratively fitted into the corresponding second stress-strain curve using the least squares method.

7. The method according to claim 1, characterized in that The simulation experiment includes a compression simulation experiment and a shear simulation experiment, the stress-strain curve includes a first stress-strain curve determined by the compression simulation experiment and a second stress-strain curve determined by the shear simulation experiment, and the performance index includes the overall elastic modulus of the composite plate and the overall effective strength of the composite plate. Among them, the performance indicators of the composite board material are determined by the following methods: Obtaining effective elastic modulus data obtained from a compression simulation experiment and effective shear modulus data obtained from a shear simulation experiment; Determine a first calculated elastic modulus and a first calculated effective strength of the mechanical properties of the entire reaction composite plate according to the effective elastic modulus data; Determine a second calculated elastic modulus and a second calculated effective strength of the overall mechanical properties of the reaction composite plate according to the effective shear modulus data; Determine the average value between the first calculated elastic modulus and the second calculated elastic modulus as the overall elastic modulus of the composite plate; The average value between the first calculated effective strength and the second calculated effective strength is determined as the overall effective strength of the composite plate.

8. A mechanical properties analysis device based on a composite material plate, characterized in that: The device comprises: The first construction module is used to construct a microscopic physical model of the composite material plate according to the design data of the composite material plate; A partitioning module, used for performing mesh partitioning on the microscopic physical model of the composite material plate to establish a target composite material plate mesh model, wherein the target composite material plate mesh model includes a metal part and a non-metal part; A connection module, used to connect the metal part and the non-metal part by using a selected contact method to obtain a composite material plate simulation model; A simulation module, used to perform a simulation experiment on the composite material plate simulation model using given simulation parameters, so as to perform a stress-strain simulation analysis on the composite material plate and determine a stress-strain curve reflecting the mechanical properties of the composite material plate; The analysis module is used to determine the performance index corresponding to the composite material plate according to the stress-strain curve and Poisson's ratio.

9. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the mechanical properties analysis method based on composite material plates as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the mechanical property analysis method based on a composite material plate as claimed in any one of claims 1 to 7 are executed.

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