A Negative Poisson's Ratio Cell and Its Honeycomb Structure

Abstract

The invention discloses a negative Poisson's ratio cell and its honeycomb structure. The negative Poisson's ratio cell includes six sides, wherein the left and right sides are arc sides, the upper and lower sides are long sides, and there are two inner vertical bars inside the cell. , the inner vertical rods are respectively connected to the left and right arc edges, and the overall cell structure is symmetrically distributed up, down, left, and right. A honeycomb stack structure with stronger performance can be obtained by combining cells with a honeycomb structure. Adjacent cells are connected by connecting rods, and two-dimensional and three-dimensional honeycomb structures that can be applied to different application scenarios are obtained. Compared with the traditional structure, when it is subjected to an external load, the vertical bar connected to the arc edge can resist the deformation of the arc edge, thereby achieving higher energy absorption, impact resistance and bearing capacity. The invention overcomes the defects of the traditional negative Poisson's ratio structure with excessively large internal voids, unstable deformation of concave corners on both sides, and poor bearing capacity, and has better impact resistance and load-bearing and energy-absorbing capabilities. The structure is simple and effective, and the honeycomb structure designed using cells has Wider range of applications.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a negative Poisson's ratio cell and a honeycomb structure composed of cells. Background technique [0002] Materials and structures widely used in nature generally have a positive Poisson's ratio, and the cross-sectional area becomes smaller when subjected to uniaxial tension, and the cross-sectional area increases when compressed. Lakes obtained the negative Poisson's ratio (NPR) foam material for the first time through the heat treatment of polyurethane foam. In 1989, Evans et al. realized the negative Poisson's ratio effect in polytetrafluoroethylene with a microporous structure, and put It is named as auxetic material. Compared with traditional materials, auxetic materials with negative Poisson's ratio effect will expand laterally when stretched. This abnormal "auxetic" behavior makes negative Poisson's ratio honeycomb materials have higher impact resistanc...

AI Technical Summary

Problems solved by technology

[0005] Although the current research on the application of the traditional hexagonal structure with concave corners in the fields of automobile collisions has shown that it has a good protective effect, the traditional structure also shows the defects of large void ratio and unstable deformation of the concave corners on both sides in the research. It deforms faster when subjected to external loads, has poor resistance to external loads, and has insufficient bearing capacity.

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