Three-dimensional auxetic metamaterial structure with negative poisson ratio

Abstract

The invention discloses a three-dimensional auxetic metamaterial structure with negative poisson ratio. The three-dimensional auxetic metamaterial structure with negative poisson ratio comprises multiple microstructures. Each microstructure comprises a tetragonal-star inward-concave structure and two inward concave hexagonal structures identical in size and structure. The tetragonal-star inward-concave structure is horizontally arranged. The tetragonal-star inward-concave structure and the two inward concave hexagonal structures are perpendicular in pairs. The tetragonal-star inward-concave structure comprises bent support columns and connection support columns arranged at the bent portions of the bent support columns. Each inward concave hexagonal structure comprises two parallel horizontal cross rods and an inclined vertical rod connected with the horizontal cross rods. The three-dimensional auxetic metamaterial structure with the negative poisson ratio is a three-dimensional structure, and the structure is simple. In this way, the three-dimensional auxetic metamaterial is wider in application range and can be more flexibly applied to different portions.

Description

technical field [0001] The invention relates to the field of metamaterials, in particular to a three-dimensional auxetic metamaterial structure with negative Poisson's ratio. Background technique [0002] "Metamaterial" is defined according to the general literature as: a class of artificial composite structures or materials with extraordinary physical properties that natural materials do not possess. As a branch of metamaterials, auxetic metamaterials have an auxetic effect as one of their main extraordinary physical properties. According to the calculation formula of Poisson's ratio: [0003] [0004] Among them, εx represents the transverse strain of the material, and εy represents the longitudinal strain of the material. [0005] When Poisson's ratio is negative, it means that the material is under tension (or compression), and the strain in the vertical load direction is the same as the sign of the strain in the parallel load direction, that is, it is expanding (or...

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Problems solved by technology

[0007] (1) The mesoscopic structure is complex, and there are certain difficulties in preparation;

[0008] (2) Some negative Poisson's ratio metamaterials are still two-dimensional structures, and the negative Poisson's ratio effect of most auxetic metamaterials is direction-dependent, that is, the material only exhibits a negative Poisson's ratio effect in some specific directions , or the negative Poisson's ratio effect in different directions is significantly different, not an isotropic material

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