Three-dimensional impact-resisting material with negative poisson ratio characteristic

Abstract

The invention discloses a three-dimensional impact-resisting material with a negative poisson ratio characteristic. The material is formed by periodically arranging single cell bodies in the three-dimensional space, wherein each single cell body is formed by connecting a pair of special-shaped quadratic element structures in a mutually orthogonal manner. The single cell bodies are tightly connected with the adjacent cell bodies in the Z direction in a mutually aligned manner through straight rib structures and tightly connected with the adjacent cell bodies through arc rib structures in a mutually parallel and aligned manner. The three-dimensional impact-resisting material with the negative poisson ratio characteristic expands in the X direction and the Y direction when being stretched inthe Z direction and contracts in the X direction and the Y direction when being compressed in the Z direction. The three-dimensional impact-resisting material with the negative poisson ratio characteristic can serve as a buffering material to be applied to structures such as automobile bodies and buffers, and the impact roughness and the anti-pressure capability are greatly improved.

Description

technical field [0001] The invention relates to the technical field of material science, in particular to a three-dimensional impact-resistant material with negative Poisson's ratio characteristics. Background technique [0002] Typically, a material specimen contracts axially when subjected to longitudinal tension and expands axially when the material specimen is compressed. This means that the Poisson's ratio of almost all common material specimens is positive, but there are still some materials with special structures whose Poisson's ratio is negative, for example: the Poisson's ratio of copper foam is -0.8. As early as the end of the 1980s, Professor Lakes prepared foam materials with negative Poisson’s ratio characteristics by thermomechanically treating ordinary foams. Due to their unique characteristics, negative Poisson’s ratio materials have gradually attracted attention and developed rapidly. stand up. [0003] Poisson's ratio (v) is expressed as follows: [000...

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Problems solved by technology

Although the concave negative Poisson's ratio honeycomb described in this paper is prepared through the above steps, because the middle part of the opposite long side of the cell is bent towards each other, there are also sharp corners, resulting in stress concentration when the honeycomb is subjected to an external load , and it is easy to crush and deform when subjected to a large load impact

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