Negative poisson ratio honeycomb structure based on bistable composite material expandable cylindrical shell

Abstract

The invention discloses a negative poisson ratio honeycomb structure based on a bistable composite material expandable cylindrical shell. The negative poisson ratio honeycomb structure consists of a plurality of honeycomb cell structures arranged in a staggered manner, wherein the honeycomb cell structures are in bistable composite material cylindrical shell honeycomb cell structures consisting of bistable cylindrical shell rods and connection round tubes, one end of each of four bistable composite material cylindrical shell rods is connected to one connection round tube of which the curling stability curvature radius is consistent with those of the bistable composite material cylindrical shell rods, and the other ends of four bistable composite material cylindrical shell rods are connected with the connection round tubes of the other honeycomb cell structures, thereby forming the honeycomb structure with the negative poisson ratio characteristic. Different from a honeycomb cell structure adopting a flat plate support, the negative poisson ratio honeycomb structure adopts the composite material cylindrical shell rods with the bistable characteristic, so that the expandsion support stiffness of the formed negative poisson ratio honeycomb structure can be improved; during compression, the negative poisson ratio honeycomb structure automatically curls and contracts; a phenomenon of larger range bucking when the flat plate structure is adopted is avoided; the negative poisson ratio effect and the structural stiffness of the negative poisson ratio honeycomb structure can be improved greatly; and the structural reliability can be improved.

Description

technical field [0001] The invention relates to a negative Poisson's ratio honeycomb structure, in particular to a negative Poisson's ratio honeycomb structure based on a bistable composite material expandable cylindrical shell. Background technique [0002] The negative Poisson's ratio structure has a wide range of applications, but its research is still limited to the level of theoretical understanding. How to improve its stiffness while maintaining the negative Poisson's ratio effect is its restrictive factor. 3D printing technology has promoted the application and development of this type of structure, but its stiffness improvement is still a weak link. By adopting bistable composite materials to expand the cylindrical shell rod, it is expected to improve the negative Poisson's ratio effect of this type of structure and at the same time increase its stiffness and promote its application. Contents of the invention [0003] The purpose of the present invention is to int...

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Problems solved by technology

[0002] The negative Poisson's ratio structure has a wide range of applications, but its research is still limited to the level of theoretical understanding. How to improve its stiffness while maintaining the negative Poisson's ratio effect is its limiting factor

3D printing technology has promoted the application and development of this type of structure, but its stiffness improvement is still a weak link

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