Zero-Poisson-ratio accordion honeycomb structure nonlinear structure relation establishing method

Abstract

The invention discloses a method for establishing a nonlinear structural relationship of a honeycomb structure of a zero-Poisson-ratio accordion. Firstly, for representative cells of a periodic accordion honeycomb structure, a flexible beam model is adopted to conduct elastic analysis and plastic analysis on bending deformation of an inclined wall plate under the large deformation condition, and equivalent projections and equivalent loads of the inclined wall plate in an elastic stage and a plastic stage are obtained; the equivalent stress, the equivalent strain, the equivalent Poisson's ratio and the equivalent Young modulus of the periodic accordion honeycomb structure in the elastic stage and the plastic stage are further calculated, particularly, the accordion honeycomb structure embodies the obvious zero Poisson's ratio effect, and finite element simulation proves the correctness and effectiveness of the method. Secondly, aiming at main structural parameters (angle, yield stress, length and thickness), the influence of each parameter on the nonlinear structural relationship of the accordion honeycomb structures is analyzed, and a method for reflecting the nonlinear structural relationship of the same type of accordion honeycomb structures is established;

Description

technical field [0001] The invention relates to the technical field of a zero Poisson's ratio accordion honeycomb structure, in particular to a method for establishing a nonlinear structure relationship of a zero Poisson's ratio accordion honeycomb structure. Background technique [0002] Poisson's ratio refers to the ratio of the absolute value of the transverse normal strain to the axial normal strain when the material is under tension or compression in one direction, also known as the transverse deformation coefficient, which is an elastic constant that reflects the transverse deformation of the material. Based on the lateral deformation effects of materials in tension or compression, materials can be classified into three categories: positive Poisson's ratio materials, negative Poisson's ratio materials, and zero Poisson's ratio materials. Most of the materials are positive Poisson's ratio materials, which show transverse contraction when longitudinally stretched and tra...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a zero Poisson's ratio accordion honeycomb structure nonlinear structural relationship establishment method, which has the advantages of higher calculation accuracy and wider application range, and solves the problem of higher cost and lower efficiency

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