Three-dimensional negative Poisson ratio periodic porous material and preparation method thereof

Abstract

The invention discloses a three-dimensional negative Poisson ratio periodic porous material and a preparation method thereof. The material is formed by splicing two rotating modules in an alternate mode; the projection shapes in the horizontal X direction and the horizontal Y direction are the same, and the projection in the vertical direction is an orthogonal square grid; when the material is subjected to stress, an inward contraction effect is produced; and when the material is subjected to pulling force, an expansion property is produced. The preparation method uses the 3D printing technology to achieve the three-dimensional negative Poisson ratio property. According to the three-dimensional negative Poisson ratio periodic porous material, the negative Poisson ratio property of a three-dimensional space is achieved; when pulled in the vertical direction, the material is expanded in the two horizontal directions; when the material is pressed in the vertical direction, the inward contraction property is produced in the two horizontal directions; and during expansion and contraction of the material, both modules in the material rotate in the direction of the concave surfaces around angular points. The negative Poisson ratio material further has good effects of energy dissipation and sound absorption and can be used for energy dissipation materials in the military field and sound insulation materials in daily life.

Description

technical field [0001] The invention belongs to the field of material science, and relates to an elastic mechanical superstructure material and a manufacturing method thereof, in particular to a three-dimensional negative Poisson's ratio material and a manufacturing method thereof. Background technique [0002] Young's modulus and Poisson's ratio are two basic parameters of structural deformation. The Poisson's ratio of most materials is positive, and the negative Poisson's ratio material can shrink laterally when compressed, and the lateral elongation when stretched shows a specific It is a good energy-absorbing material and is widely used in the fields of machinery, aviation, defense, marine and other fields. Most of the negative Poisson's ratio materials are porous and repetitive materials. [0003] In the past 100 years, people have gradually started to study negative Poisson's ratio materials. Negative Poisson's ratio materials in nature include cow teat skin, silica w...

AI Technical Summary

Problems solved by technology

It can be found that although these materials have the form of three-dimensional negative Poisson's ratio, the requirements for structural scarcity are very high.

And many include hinges and slender beams, or similar to truss systems, and need to meet conditions such as bending and torsion, which still remain in theory, which is not conducive to design as a continuous material

Traditional negative Poisson's ratio materials have a certain theoretical basis, but due to the high anisotropy of three-dimensional negative Poisson's ratio materials, there are few successful cases in the design and manufacturing process

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