A high-strength and damage-resistant lattice structure design system and design method

Abstract

The present invention discloses a high-strength and damage-resistant lattice structure design system and design method, which includes a gradient lattice structure feature extraction module, a scheme generation module, a performance analysis module, and a structure design module. The gradient lattice structure feature extraction module extracts its features, generates a scheme through soft foam or plastic material or metal material endowment for performance analysis. Under the condition of ensuring equal mass, it is classified using yield strength and the type of minimum cell density, and the minimum cell density of the existing gradient lattice structure is replaced and combined to complete the structural redesign, thereby forming a high-strength and damage-resistant lattice structure. The design method of the present invention is simple, enabling the uniform distribution of weak areas with smaller density, thus greatly improving the overall strength of the structure and significantly enhancing the mechanical properties of the original gradient lattice structure.

Description

Technical Field

[0001] The present invention relates to the field of lightweight structural design, and particularly to a high-strength and damage-resistant lattice structure design system and design method. Background Art

[0002] Lightweight has shown strong development potential in the fields of aviation, aerospace, automobiles, etc. Three-dimensional lattice structures have developed under this background. As a new type of lightweight, high-strength and multifunctional structure, they have only a development history of more than ten years. Due to the integration of multiple characteristics such as light weight, high strength and multifunction in the three-dimensional lattice structure itself, it can meet both the load-bearing requirements and the requirements of multiple functions while satisfying the load-bearing requirements. It is considered to be the most promising new generation of advanced lightweight and super-strong and tough structures, and has begun to be applied to key components such as aircraft, replacing the traditional honeycomb structure. In addition, in the fields of medicine, automobiles, ships, etc., three-dimensional lattice structures can also be used as materials and structures for energy absorption, shock absorption, heat dissipation, wave absorption, stealth, and biocompatibility, and have a wide range of uses.

[0003] Currently, the space filling of three-dimensional lattice structures mainly includes uniform filling, variable density filling and hierarchical filling. Among them, the gradient lattice structure is formed by superimposing in a variable density manner according to certain rules or the results of topology optimization. For the uniaxial compression condition, different from the single-point or single-line stress conditions, under the action of surface force, the gradient lattice structure is prone to premature buckling or large plastic deformation in the weak area with a smaller density. At this time, the strengthening area with a larger density is difficult to play its role, resulting in a rapid decline in the strength of the gradient lattice structure. Although its performance can vary gradiently along the axial direction, the overall strength of its structure is difficult to be improved. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-strength and damage-resistant lattice structure design system and design method for the existing deficiencies.

[0005] In order to overcome the deficiencies of the prior art, the present invention adopts the following technical solutions:

[0006] A high-strength and damage-resistant lattice structure design system includes a gradient lattice structure feature extraction module, a scheme generation module, a performance analysis module and a structure design module;

[0007] The gradient lattice structure feature extraction module is configured to classify the gradient lattice structure into the density of the minimum cell , the type of density of the minimum cell and the preferred density under the type of density of the minimum cell , where the minimum cell density is:

[0008] ;

[0009] represents the volume of the corresponding minimum unit cell, represents the solid volume of the corresponding minimum unit cell;

[0010] The number of density types of the minimum unit cell is determined by the value of i , i The value of is determined by comparing the densities of all minimum unit cells in the gradient lattice structure , where j , k , m represent the storage positions of the minimum unit cell in the gradient lattice structure, j is the x direction position of the gradient lattice structure where the minimum unit cell is located, k is the y direction position of the gradient lattice structure where the minimum unit cell is located, m is the z direction position of the gradient lattice structure where the minimum unit cell is located; further, i takes integer values starting from 1, i The maximum value of is obtained by sorting the densities of the minimum unit cells , then taking the difference between any , and determining the maximum i value based on the types of all different difference magnitudes;

[0011] The preferred density under the density type of the minimum unit cell takes the value:

[0012] ;

[0013] wherein, j , k , m are all integers;

[0014] The said scheme generation module generates a total of j , k , m types of schemes by traversing the values of j × k × m , and is configured to select materials, where the traversed j = j 1, k = k 1, m = m 1, the material of the minimum unit cell with density is selected as soft foam or plastic material; while the density is The material of the minimum unit cell is selected as a metallic material, where ;

[0015] The performance analysis module is configured to perform finite element meshing on each solution based on the j × k × m solutions obtained by the solution generation module and their associated soft and hard material setting information, and obtain the compression force and displacement curves through compression simulation based on the CAE simulation model of uniaxial compression, and then obtain the yield strength under different j , k , m value schemes ;

[0016] The structure design module sorts the magnitudes of the yield strengths under different j , k , m value schemes , and according to the minimum unit cell density types obtained by the gradient lattice structure feature extraction module of the i value magnitude, divides the yield strengths j , k , m under different value schemes into i categories, where the i value is larger, and the corresponding j , k , m yield strengths under the value schemes are larger;

[0017] Furthermore, traverse the j , k , m ( ) values, and by discriminating the j , k , m yield strengths under the value schemes, select the corresponding preferred density i to replace the value under this j , k , m value, and after traversing j × k × m times, a high-strength and damage-resistant lattice structure is formed.

[0018] ​On the other hand, the present invention also includes a method for using the above-mentioned high-strength and damage-resistant lattice structure design system. The design method includes: - a gradient lattice structure feature extraction module extracts the spatial features of the gradient lattice structure; - a scheme generation module sets the material information of the gradient lattice structure, - a performance analysis module performs finite element meshing on the scheme to obtain the yield strength under different j , k , m value schemes, and a structure design module optimally configures the minimum unit cell density of the gradient lattice structure.

[0019] Advantages of the present invention: Based on the existing gradient lattice structure, the mechanical property enhancement and weakening mechanisms of gradient lattice structure materials (gradient distribution change of grain size) and MCG-level mixed crystal structure (coexistence of millimeter-level and micron-level grains) in the field of materials science, the present invention extracts their characteristics, generates a scheme by selecting soft foam or plastic materials or metal materials for performance analysis. Under the condition of ensuring equal mass, it classifies using the yield strength and the types of minimum unit cell density, replaces and combines the minimum unit cell density of the existing gradient lattice structure to complete the structural redesign, and then forms a high-strength and damage-resistant lattice structure. The design method of the present invention is simple, enabling the uniform distribution of weak regions with smaller density, thereby greatly improving the overall strength of the structure and significantly enhancing the mechanical properties of the original gradient lattice structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments of the present invention. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Shown is a schematic diagram of the structure design system of the present invention;

[0022] Figure 2 Shown is a schematic diagram of the original gradient lattice structure of the present invention;

[0023] Figure 3 Shown is a three-dimensional view of the high-strength and damage-resistant lattice structure of the present invention;

[0024] Figure 4 Shown is a front view of the high-strength and damage-resistant lattice structure of the present invention;

[0025] Figure 5 Shown is a side view of the high-strength and damage-resistant lattice structure of the present invention;

[0026] Figure 6 Shown is a top view of the high-strength and damage-resistant lattice structure of the present invention;

[0027] Figure 7 The experimental comparison effect diagram of the present invention is shown as follows. Specific embodiments

[0028] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific embodiments.

[0029] Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical diagrams, and should not be construed as a limitation of this patent; in order to better illustrate the embodiments of the present invention, some components in the accompanying drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0030] It should be stated that the above specific embodiments are only the preferred embodiments of the present invention and the technical principles applied. Those skilled in the art should understand that various modifications, equivalent substitutions, changes, etc. can be made to the present invention. However, as long as these transformations do not deviate from the spirit of the present invention, they should be within the protection scope of the present invention. In addition, some terms used in the description and claims of this application are not restrictive, but are only for the convenience of description.

[0031] Example 1: Refer to the attached Figure 1 , a high-strength and damage-resistant lattice structure design system, including a gradient lattice structure feature extraction module, a scheme generation module, a performance analysis module, and a structure design module. The gradient lattice structure feature extraction module is configured to classify the gradient lattice structure into the density of the minimum cell , the type of density of the minimum cell and the preferred density under the type of density of the minimum cell , where the density of the minimum cell is:

[0032] ;

[0033] represents the volume of the corresponding minimum cell, represents the solid volume of the corresponding minimum cell;

[0034] The number of types of density of the minimum cell is determined by the value of i , and the value of i is determined by comparing all the densities of the minimum cells in the gradient lattice structure , where j , k , m represent the storage positions of the minimum cells in the gradient lattice structure, j is the of the gradient lattice structure where the minimum cell is locatedx Directional position k is the directional position of the gradient lattice structure where the minimum cell is located y Directional position m is the directional position of the gradient lattice structure where the minimum cell is located z Furthermore i takes values as integers starting from 1 i The maximum value of is obtained by sorting the density of the minimum cell and then taking the difference for any to determine the maximum value according to the types of all different difference magnitudes i value

[0035] Density types of the minimum cell Preferred density under takes values as

[0036] ;

[0037] Among them j , k , m are all integers

[0038] The scheme generation module generates a total of j , k , m by traversing the values of, generating j × k × m schemes, and is configured to select materials for the material. Among them, the traversed j = j 1, k = k 1, m = m 1 density of the minimum cell selects soft foam or plastic material; while the density is , where the minimum cell selects metal material

[0039] The performance analysis module is configured to, according to the j × k × m schemes obtained by the scheme generation module, and the related soft material and hard material setting information, perform finite element meshing on each scheme, and conduct compression simulation based on the CAE simulation model of uniaxial compression to obtain the compression force and displacement curves, and then obtain the yield strength j , k , m under different value schemes of ;

[0040] The structure design module, according to the yield strength under different j 、 k 、 m value-taking schemes obtained by the performance analysis module , sorts their sizes, and according to the types of minimum cell density obtained by the gradient lattice structure feature extraction module 's i value sizes, divides the yield strengths under different j 、 k 、 m value-taking schemes into i categories. Among them, the larger the i value, the greater the corresponding yield strengths under the j 、 k 、 m value-taking schemes ;

[0041] Furthermore, traverse j 、 k 、 m ( ) value-taking, and by judging the j 、 k 、 m value sizes corresponding to the yield strengths under the value-taking schemes, select the corresponding optimal density to replace the i value under this 、 k 、 m 、 value-taking. After traversing j × k × m × times, a high-strength and damage-resistant lattice structure is formed.

[0042] j Embodiment 2: This embodiment includes all the technical features of the first embodiment. Furthermore, it also includes a design method for a high-strength and damage-resistant lattice structure design system. The design method includes: - The gradient lattice structure feature extraction module extracts the spatial features of the gradient lattice structure; - The scheme generation module sets the material information of the gradient lattice structure, - The performance analysis module obtains the yield strengths under different k 、 m 、 value-taking schemes through finite element meshing of the scheme, - The structure design module optimizes and configures the minimum cell density of the gradient lattice structure.

[0043] Figures 2-7 Embodiment 3: As As shown, a gradient lattice structure includes a first density structure 1, a second density structure 2, a third density structure 3 and a fourth density structure 4. The density type of the smallest cell is There are 4 categories ( i =4), j = k = m =4, j max = k max = m max = 4. The density of the minimum cell according to z The gradient of the direction is divided into 、 、 and ,Right now 、 、 and The generated high-strength and damage-resistant lattice structure is as follows, and its overall layout is as follows Figure 4 As shown. The first density structure 1, the first density structure 2, the third density structure 3, and the first density structure 4 are rearranged and combined in the three-dimensional feature space according to the design method. Specifically, the first density structure 1, the first density structure 2, the third density structure 3, and the first density structure 4 are arranged at intervals in the three-dimensional feature space according to the design method.

[0044] Further, such as Figure 5 Front view of high-strength and damage-resistant lattice structure, Figure 6 Side view of high-strength and damage-resistant lattice structure Figure 7 As shown in the top view of the high-strength and damage-resistant lattice structure, the periphery of any density structure and its overlapping density structure can be itself or other density structures. Specifically, Figure 6 The periphery of the first density structure 1 and the density structure it overlaps can be the same as the first density structure 1. Figure 7 The periphery of the first density structure 1 and its overlapping density structures are the first density structure 2, the third density structure 3 and the fourth density structure 4. For a resin material with a density of 1.2g / cm3, an elastic modulus of 1030MPa, a Poisson's ratio of 0.37, a yield strength of 17MPa and a tensile strength of 27MPa, a 3D printing device is used to print Figure 2 The gradient lattice structure and Figure 3 The high-strength and damage-resistant lattice structure was printed. The results of the uniaxial compression test showed that the yield strength of the original gradient lattice before design was 2.2MPa, and the yield strength of the high-strength and damage-resistant lattice structure after design was 3.2MPa, and the overall strength was increased by 45.5%.

[0045] It should be noted that the above specific embodiments are only the preferred embodiments of the present invention and the technical principles applied. Those skilled in the art should understand that various modifications, equivalent substitutions, changes, etc. can be made to the present invention. However, as long as these transformations do not depart from the spirit of the present invention, they should be within the protection scope of the present invention. In addition, some terms used in the specification and claims of this application are not restrictive, but are only for the convenience of description.

Claims

1. A high-strength and damage-resistant lattice structure design system, comprising a gradient lattice structure feature extraction module, a scheme generation module, a performance analysis module, and a structure design module, characterized in that: The gradient lattice structure feature extraction module is configured to classify the gradient lattice structure features into the density of the minimum cell , the density types of the minimum cell and the preferred density under the density type of the minimum cell , where the minimum cell density is: ； represents the volume of the corresponding minimum unit cell, represents the solid volume of the corresponding minimum unit cell; The number of density types of the minimum cells is determined by i 's value. i 's value is determined by comparing the densities of all minimum cells in the gradient lattice structure , where j , k , m represent the storage positions of the minimum cells in the gradient lattice structure. j is the x direction position of the gradient lattice structure where the minimum cell is located. k is the y direction position of the gradient lattice structure where the minimum cell is located. m is the z direction position of the gradient lattice structure where the minimum cell is located. Further, i 's value is an integer starting from 1. i 's maximum value is obtained by sorting the minimum cell densities , then taking the differences for any , and determining the maximum i value based on the types of all different difference magnitudes; Density types of the minimum cell Preferred density under The value is: ； Among them, j , k , m are all integers; The scheme generation module generates a total of j 、 k 、 m solutions by traversing the values of j × k × m and is configured to select materials; among them, the j = j 1, k = k 1, m = m 1, and the material of the minimum cell with a density of is selected as soft foam or plastic material; while the material of the minimum cell with a density of is selected as metal material; among them, ； The performance analysis module is configured to, according to the j × k × m solutions and material information obtained by the solution generation module, perform finite element meshing on each solution, conduct compression simulation based on the CAE simulation model of uniaxial compression to obtain the compression force and displacement curves, and then obtain the yield strength j 、 k 、 m under different value-taking solutions ; The structure design module, according to the yield strengths under different j , k , m value-taking schemes obtained by the performance analysis module, , sorts their sizes. According to the minimum cell density types obtained by the gradient lattice structure feature extraction module, and the i value sizes, the yield strengths under different j , k , m value-taking schemes are divided into i categories. Among them, the larger the i value, the greater the corresponding j , k , m yield strengths under the value-taking schemes ; Further, under the condition of , traverse j , k , m again. By judging the yield strength j , k , m corresponding to the value-taking scheme, select the corresponding preferred density to replace the i value corresponding to the values of j , k , m . After traversing times, a high-strength and damage-resistant lattice structure is formed by j × k × m .

2. A design method using the high-strength and damage-resistant lattice structure design system described in claim 1, characterized in that The described design method includes: - extracting the spatial characteristics of the gradient lattice structure; - setting the material information of the gradient lattice structure, - performing finite element meshing to obtain the yield strengths under different j , k , m value schemes, - optimizing the configuration of the minimum cell density of the gradient lattice structure, - obtaining a high-strength and damage-resistant lattice structure.

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