Method for constructing three-dimensional negative poisson ratio structure based on regular tetrahedron frame

A technology of negative Poisson's ratio and positive tetrahedron, which is applied in the field of constructing a three-dimensional negative Poisson's ratio structure based on a positive tetrahedral framework, can solve problems such as quantitative control, difficult nature of negative Poisson's ratio, and failure to meet application requirements well. To achieve the effect of enhancing the mechanical properties of materials

Pending Publication Date: 2021-04-27
SOUTHWEST UNIVERSITY
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Problems solved by technology

[0005] In view of this, in order to solve the problem that the existing three-dimensional negative Poisson’s ratio material has negative Poisson’s ratio properties in practical applications, it is difficult to quantitatively control according to different application scenarios, and cannot well meet its application requirements. A Method of Constructing Three-dimensional Negative Poisson's Ratio Structures with Volume Frames

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  • Method for constructing three-dimensional negative poisson ratio structure based on regular tetrahedron frame
  • Method for constructing three-dimensional negative poisson ratio structure based on regular tetrahedron frame
  • Method for constructing three-dimensional negative poisson ratio structure based on regular tetrahedron frame

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Embodiment 1

[0039] A method for constructing a three-dimensional negative Poisson's ratio structure based on a positive tetrahedron framework, comprising the following steps:

[0040] A. Define basic hexahedron unit parameters: each hexahedron unit is composed of six surface crease lines and eight outer boundary lines, and the plane parameters of each hexahedron unit are: A(0, 86.603, -50); B(50, 86.603 ,0);C(50,0,-50);D(50,-86.603,0);E(0,-86.603,-50);F(-50,-86.603,0);G(-50 , 0, -50); H (-50, 86.603, 0); O (0, 0, 0); A' (0, 86.603, -70); B' (50, 86.603, -20); C' (50, 0, -70); D'(50, -86.603, -20); E'(0, -86.603, -70); F'(-50, -86.603, -20); G'(- 50, 0, -70); H'(-50, 86.603, -20); O'(0, 0, -20); obtain a hexahedron unit entity with a thickness of 0.2;

[0041] B. Stacking the hexahedron unit entity: the 7×3 hexahedron unit array constructed in step A is formed into a planar plate structure, and the two planar plates are combined in pairs with a dihedral angle of 35.264°, and one of the p...

Embodiment 2

[0049] Embodiment 2 is the space expansion of the negative Poisson's ratio structure of the three-dimensional repeated tetrahedron frame

[0050] Such as Figure 6 The difference between the shown embodiment 2 and the embodiment 1 is that in step B, the three-dimensional negative Poisson’s ratio structure is stacked in space along the three directions of x, y, and z in 2×2×2 to form a negative Poisson’s ratio structure assembly , build its model in standard CAD software. Using TPU consumables for 3D printing manufacturing, the printing process settings are as follows:

[0051]

[0052] The 2×2×2 negative Poisson’s ratio structure-space assembly has a good shape, and the quantitative control of its negative Poisson’s ratio properties can also be realized by adjusting the thickness of the hexahedron unit.

[0053] A further preferred solution is that the negative Poisson's ratio structural space combination can adopt any number of regular tetrahedral frame combinations, and...

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Abstract

The invention belongs to the field of mechanical metamaterial structure design, and relates to a method for constructing a three-dimensional negative poisson ratio structure based on a regular tetrahedron frame; the method comprises the following steps: designing geometric parameters of hexadecahedron units, stacking the hexadecahedron units with specific parameters according to a mode of forming a specific dihedral angle between layers, and finally constructing a repeated regular tetrahedron frame; the space stacking strategy can ensure formation of a three-dimensional negative poisson ratio structure, and poisson ratio behaviors of the three-dimensional negative poisson ratio structure change regularly according to different configurations of thickness parameters of hexadecahedron units; according to the design, quantitative regulation and control of the negative Poisson's ratio property of the material are realized while the force performance of the material is enhanced by the negative Poisson's ratio structure, so that application scenes with different negative Poisson's ratio requirements are met.

Description

technical field [0001] The invention belongs to the field of mechanical metamaterial structure design, and relates to a method for constructing a three-dimensional negative Poisson's ratio structure based on a positive tetrahedron frame. Background technique [0002] A metamaterial is a rationally engineered man-made material that derives its properties from its structure rather than its constituent materials. Negative Poisson's ratio materials are a typical class of mechanical metamaterials, which often exhibit counterintuitive deformation behavior during deformation. Under uniaxial compression (tension), conventional materials expand (shrink) perpendicular to the load direction. , while negative Poisson's ratio materials shrink (expand) in the transverse direction. Owing to their unusual deformation mechanism, materials with negative Poisson's ratio structures can significantly enhance the mechanical properties of materials without introducing any fillers or changing thei...

Claims

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Application Information

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IPC IPC(8): G16C60/00
CPCG16C60/00
Inventor 甘霖黄进胡欢
Owner SOUTHWEST UNIVERSITY
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