A design method for bionic honeycomb lattice structure

Abstract

The present invention is applicable to the technical field of lattice structures, and provides a method for designing a bionic honeycomb lattice structure, the method comprising: starting from the characteristics of the honeycomb structure, extracting the main structural elements and structural mechanisms through similarity analysis and extraction of the honeycomb structure, confirming the selected elements from the perspectives of structural similarity, functional similarity and boundary similarity through a similarity analysis method according to the bionics principle; extracting structural features according to the characteristics of the honeycomb structure and fusing them with the concave triangle structure to establish a three-dimensional macroscopic preliminary bionic honeycomb single cell structure, and establishing the range of each element and its size for structural construction and dimensional parameter optimization; the content of the present invention: the lightweight degree and energy absorption performance of parts can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of lattice structures, and in particular relates to a bionic honeycomb lattice structure design method. Background Art

[0002] The lattice structure not only has the advantages of light weight and high mechanical strength, but also has good manufacturability to a certain extent. Therefore, it has been widely used in transportation, aerospace, armor protection and other fields. As a special structural form, the lattice structure provides new ideas and methods for lightweight and high energy absorption fields.

[0003] The honeycomb structure has the advantages of strong bearing capacity, material saving, and good structural energy absorption. It is the most typical porous material in nature. Bees have evolved a periodic hexagonal honeycomb structure through tens of thousands of years, which is mainly used to store honey and pollen. The hexagonal honeycomb structure consumes the least beeswax while providing the largest space. In later studies, the honeycomb structure was widely used in various industries such as aerospace, automobiles, and medical care. It can be seen that the honeycomb structure will still be a research focus in the future, and more research results will be obtained based on this.

[0004] When the concave side of the concave triangle structure is subjected to an axial load, the short sides of the unit cell structure will cause the long sides to shrink and shift inward laterally due to the bending, so that the overall structure exhibits a negative Poisson's ratio. The overall energy absorption of the concave structure will be greatly enhanced after being three-dimensionalized. However, there is currently no method of combining the concave triangle structure with a honeycomb structure to form a bionic honeycomb lattice structure. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a bionic honeycomb lattice structure design method, aiming to solve the problems existing in the prior art identified in the background technology.

[0006] The embodiment of the present invention is implemented as follows: a method for designing a bionic honeycomb lattice structure, the method comprising:

[0007] Starting from the characteristics of honeycomb structure, the main structural elements and structural mechanisms are extracted through similarity analysis and extraction of honeycomb structure. According to the principle of bionics, the similarity analysis method is used to confirm and analyze the selected elements from the perspectives of structural similarity, functional similarity and boundary similarity.

[0008] According to the characteristics of honeycomb structure, the structural features are extracted and integrated with the concave triangle structure to establish a three-dimensional macroscopic preliminary bionic honeycomb unit cell structure, and the range of each element and its size is determined for structural construction and size parameter optimization;

[0009] The influence of structural parameters on the energy absorption performance of the preliminary bionic honeycomb unit cell structure was studied by single factor analysis and response surface methodology; the preliminary bionic honeycomb unit cell structure was optimized and the structural parameters of the bionic honeycomb unit cell structure with the best energy absorption performance were obtained;

[0010] The bionic honeycomb unit cell structure is constructed using the structural parameters of the bionic honeycomb unit cell structure with the best energy absorption performance;

[0011] The endpoints of the bionic honeycomb unit cell structure are connected and arrayed to form a bionic honeycomb lattice structure.

[0012] Preferably, after the bionic honeycomb lattice unit cell structures are arrayed to form a bionic honeycomb lattice structure, the method further comprises:

[0013] The performance of the bionic honeycomb lattice structure was verified through quasi-static compression simulation tests;

[0014] The bionic honeycomb lattice structure was prepared by additive manufacturing technology, and a quasi-static compression test was carried out to verify the accuracy of the simulation test.

[0015] Preferably, the bionic honeycomb unit cell structure includes: the concave triangular structure 1 is formed by flattening the top of a regular triangle, having two inward folds at the bottom and extending a section to both ends, and the honeycomb structure and the concave triangular structure 1 are merged, and a two-dimensional structure with a honeycomb shape is formed by symmetric the lower bottom surface of the concave triangular structure 1, and then the two-dimensional plane structure is rotated around the vertical center line to generate a bionic honeycomb unit cell structure 2, which presents a centrally symmetrical structure, and the endpoints of the bionic honeycomb unit cell structure are connected in an array to form a bionic honeycomb lattice structure 3.

[0016] Preferably, the outer side length L1 of the preliminary bionic honeycomb lattice structure is 8.5 mm, with a value range of 7.5 mm-9.5 mm, the inner side length L2 is 4.5 mm, with a value range of 3.5 mm-5.5 mm, the outer side thickness T1 is 1 mm, with a value range of 0.8 mm-1.2 mm, the inner side thickness T2 is 0.8 mm, with a value range of 0.6 mm-1 mm, the upper angle G1 is 30°, with a value range of 24°-36°, the lower angle G2 is 60°, with a value range of 54°-60°, the upper side width N is 3 mm, with a value range of 2 mm-4 mm, and the lower side width D is 9 mm, with a value range of 8 mm-10 mm.

[0017] Preferably, the optimized bionic honeycomb lattice unit cell structure has a height H = 14.86 mm, a width W1 = 18 mm, a top width W2 = 5 mm, an outer side length L1 = 7.5 mm, an inner side length L2 = 3.5 mm, an outer side thickness T1 = 1 mm, an inner side thickness T2 = 0.8 mm, an upper angle G1 = 31°, a lower angle G2 = 60°, an upper side width N = 2.5 mm, and a lower side width D = 9 mm.

[0018] A bionic honeycomb lattice structure designed by using the bionic honeycomb lattice structure design method as described above, wherein the bionic honeycomb lattice structure is formed by connecting the endpoints of the bionic honeycomb lattice unit cell structure in an array.

[0019] The embodiment of the present invention provides a bionic honeycomb lattice structure design method based on a concave triangle structure. The lattice structure design method provided by the present invention is controllable and repeatable. This design method can be used to analyze and extract the characteristics of animals and plants in nature, customize different forms of lattice lattices in combination with existing structures, explore more lattice structures with special properties and application potentials, and promote the development and innovation in the field of structural engineering; the concave triangle structure is combined with the honeycomb structure to integrate the advantages of both. The bionic honeycomb lattice structure based on the concave triangle structure has greater advantages than traditional structures in shear bearing capacity, energy absorption and fracture resistance. It has a sophisticated structure, is applicable and saves materials. Due to the arrangement and a series of continuous honeycomb-shaped mesh structures, it can disperse the external force and has stronger resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the feature extraction and design process of the bionic honeycomb unit cell structure provided by an embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the size parameters of the concave triangle structure in the bionic honeycomb unit cell structure provided by an embodiment of the present invention;

[0022] Figure 3 It is a front view and a schematic diagram of size parameters of a bionic honeycomb lattice unit cell structure provided by an embodiment of the present invention;

[0023] Figure 4 is a top view of a bionic honeycomb lattice unit cell structure provided by an embodiment of the present invention;

[0024] Figure 5 It is an isometric view of a bionic honeycomb lattice unit cell structure provided by an embodiment of the present invention;

[0025] Figure 6 It is a front view of a bionic honeycomb lattice structure provided by an embodiment of the present invention;

[0026] Figure 7is a top view of a bionic honeycomb lattice structure provided by an embodiment of the present invention;

[0027] Figure 8 It is an isometric view of a bionic honeycomb lattice structure provided by an embodiment of the present invention;

[0028] Fig. 9 A bionic honeycomb lattice structure photocuring 3D preparation provided by an embodiment of the present invention;

[0029] Fig.10 This is a diagram of a quasi-static compression test process of a bionic honeycomb lattice structure provided by an embodiment of the present invention;

[0030] Fig.11 It is a contact force-displacement diagram of a quasi-static compression test of a bionic honeycomb lattice structure provided by an embodiment of the present invention;

[0031] Fig.12 It is a total energy absorption-displacement diagram of a quasi-static compression test of a bionic honeycomb lattice structure provided by an embodiment of the present invention;

[0032] Fig.13 It is a specific energy absorption-displacement diagram of a quasi-static compression test of a bionic honeycomb lattice structure provided by an embodiment of the present invention;

[0033] Fig.14 It is a stress-strain diagram of a quasi-static compression test of a bionic honeycomb lattice structure provided by an embodiment of the present invention; DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0036] like Figure 1 As shown, starting from the characteristics of honeycomb structure, the main structural elements and structural mechanisms are extracted through similarity analysis and extraction of honeycomb structure. According to the principle of bionics, the similarity analysis method is used to confirm and analyze the selected elements from the perspectives of structural similarity, functional similarity and boundary similarity.

[0037] like Figure 1 As shown, according to the characteristics of the honeycomb structure, the structural features are extracted and integrated with the concave triangle structure to establish a three-dimensional macroscopic preliminary bionic honeycomb unit cell structure, and the range of each element and its size is determined for structural construction and size parameter optimization;

[0038] like Figure 1As shown, the influence of structural parameters on the energy absorption performance of the preliminary bionic honeycomb unit cell structure is studied by single factor analysis method and response surface method; the preliminary bionic honeycomb unit cell structure is optimized and designed, and the structural parameters of the bionic honeycomb unit cell structure with the best energy absorption performance are obtained;

[0039] like Figure 2-Figure 5 As shown, the bionic honeycomb unit cell structure is constructed using the structural parameters of the bionic honeycomb unit cell structure with the best energy absorption performance;

[0040] like Figure 6-Figure 8 As shown, the endpoints of the bionic honeycomb unit cell structure are connected in an array to form a bionic honeycomb lattice structure, and the performance is verified by a quasi-static compression simulation test;

[0041] The required three-dimensional model is created through computer-aided design (CAD) software. After the design is completed, the model is converted into STL format for subsequent printing preparation.

[0042] Slicing: Input the 3D model in STL format into the slicing software for slicing. The slicing software decomposes the model into multiple layers of thin slices, each with a thickness of 0.05 mm, and generates the printing path information for each layer to determine the trajectory of the light beam during printing.

[0043] Printing preparation: Select photosensitive resin material and transmit the printing path information generated by the slicing software to the printer control system.

[0044] 3D printing: Start the printer, light intensity is 500mW / cm 2 , the printing speed is 10mm / h, the light source is irradiated on the first layer of resin, solidified to form the first layer, and then the working platform is lowered a certain distance to expose the next layer of resin to the light source, and the light beam is irradiated again, and this process is repeated until the entire model is printed.

[0045] Post-processing: After printing is completed, the printed object is removed from the printing platform for post-processing such as removing support structures, cleaning, and curing;

[0046] like Fig.10 As shown, a quasi-static compression test is carried out to verify the accuracy of the simulation test;

[0047] Combination Figure 11-Figure 14The embodiment of the present invention provides a bionic honeycomb lattice structure design method based on a concave triangle structure, which is controllable and repeatable. This design method can be used to analyze and extract the characteristics of plants and animals in nature, customize different forms of lattice lattices in combination with existing structures, explore more lattice structures with special properties and application potential, and promote the development and innovation in the field of structural engineering; the concave triangle structure is combined with the honeycomb structure, integrating the advantages of both. The bionic honeycomb lattice structure based on the concave triangle structure has greater advantages than the traditional structure in shear bearing capacity, energy absorption and fracture resistance, strong bearing capacity, exquisite structure, applicability and material saving. Due to the arrangement and a series of continuous honeycomb-shaped mesh structures, it can disperse the external forces from all sides and has stronger resistance. Therefore, the present invention has good practical value.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bionic honeycomb lattice structure design method, characterized in that: The method comprises: Starting from the characteristics of honeycomb structure, the main structural elements and structural mechanisms are extracted through similarity analysis and extraction of honeycomb structure. According to the principle of bionics, the similarity analysis method is used to confirm and analyze the selected elements from the perspectives of structural similarity, functional similarity and boundary similarity. According to the characteristics of the honeycomb structure, structural feature extraction is performed and integrated with the concave triangle structure to establish a three-dimensional macroscopic preliminary bionic honeycomb cell structure, and the range of each element and its size is established for structural construction and size parameter optimization. The bionic honeycomb cell structure includes: the concave triangle structure 1 is formed by a regular triangle with a flat top and two inward folds at the bottom and a section extending from both ends. The honeycomb structure and the concave triangle structure 1 are integrated, and the lower bottom surface of the concave triangle structure 1 is symmetrical to form a two-dimensional structure with a honeycomb shape. Then, the two-dimensional plane structure is rotated around the vertical center line to generate a bionic honeycomb cell structure 2. The structure is a centrally symmetrical structure. The endpoints of the structure are connected in an array to form a bionic honeycomb lattice structure 3, wherein the outer side length L1 of the preliminary bionic honeycomb lattice structure is 8.5 mm, ranging from 7.5 mm to 9.5 mm, the inner side length L2 is 4.5 mm, ranging from 3.5 mm to 5.5 mm, the outer side thickness T1 is 1 mm, ranging from 0.8 mm to 1.2 mm, the inner side thickness T2 is 0.8 mm, ranging from 0.6 mm to 1 mm, the upper angle G1 is 30°, ranging from 24° to 36°, the lower angle G2 is 60°, ranging from 54° to 60°, the upper side width N is 3 mm, ranging from 2 mm to 4 mm, and the lower side width D is 9 mm, ranging from 8 mm to 10 mm; Optimize the design of the preliminary bionic honeycomb unit cell structure and obtain the structural parameters of the bionic honeycomb unit cell structure with the best energy absorption performance; The bionic honeycomb unit cell structure is constructed using the structural parameters of the bionic honeycomb unit cell structure with the best energy absorption performance; The endpoints of the bionic honeycomb unit cell structure are connected and arrayed to form a bionic honeycomb lattice structure.

2. The bionic honeycomb lattice structure design method according to claim 1, characterized in that: After the bionic honeycomb lattice unit cell structures are arrayed to form a bionic honeycomb lattice structure, the method further comprises: The performance of the bionic honeycomb lattice structure was verified through quasi-static compression simulation tests; The bionic honeycomb lattice structure was prepared by additive manufacturing technology, and a quasi-static compression test was carried out to verify the accuracy of the simulation test.

3. The bionic honeycomb lattice structure design method according to claim 1, characterized in that: The optimized bionic honeycomb lattice unit cell structure has a height of H = 14.86mm, a width of W1 = 18mm, a top width of W2 = 5mm, an outer side length of L1 = 7.5mm, an inner side length of L2 = 3.5mm, an outer side thickness of T1 = 1mm, an inner side thickness of T2 = 0.8mm, an upper angle of G1 = 31°, a lower angle of G2 = 60°, an upper side width of N = 2.5mm, and a lower side width of D = 9mm.

4. A bionic honeycomb lattice structure designed by using a bionic honeycomb lattice structure design method as claimed in any one of claims 1 to 3, characterized in that: The bionic honeycomb lattice structure is formed by connecting the endpoints of the bionic honeycomb lattice unit cell structure in an array.

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