Analysis And Experimental Study Of New Three-Dimensional Negative Poisson’s Ratio Cellular Structure

Honeycomb multi-cell structure is a special composite layer material.Compared with traditional materials,it has many advantages such as lower density,higher specific strength,better energy absorption effect,easier design into various shapes and so on,and is widely used in various fields such as ships,aviation,national defense and so on.Different from traditional positive Poisson’s ratio materials,negative Poisson’s ratio materials will expand laterally under uniaxial tension.This unique phenomenon makes the mechanical properties of negative Poisson’s ratio cellular structure superior to those of traditional materials.With the increasing demand for high-tech engineering technology in modern society,it is of far-reaching significance to carry out relevant research work on new negative Poisson’s ratio topological structures.Therefore,this paper combines the development and application of honeycomb structures and the research status of negative Poisson’s ratio cellular structures at home and abroad,and carries out relevant research on the following aspects:(1)Summarize the research on negative Poisson’s ratio at home and abroad,design two new three-dimensional honeycomb cell structures with negative Poisson’s ratio and construct two different negative Poisson’s ratio overall structures through permutation and combination.(2)Based on the numerical calculation of homogenization method,ABAQUS finite element software is used to calculate the parameters affecting the mechanical properties of representative volume elements and compare with the simulation results of the overall negative Poisson’s ratio structure.The results show that the overall structural performance can be reflected by analyzing the cellular structure.The mechanical properties of cellular structure mainly depend on the structural form and the material attribute parameters.The equivalent Poisson’s ratio is mainly affected by the structural form,but it is also related to the material Poisson’s ratio.With the increase of the material Poisson’s ratio,the negative Poisson’s ratio effect is more obvious,while the equivalent elastic modulus is mainly affected by the material’s own attributes.The equivalent elastic modulus increases with the increase of the material elastic modulus,but it is also closely related to the change of the structural form.(3)The honeycomb structure specimens with negative Poisson’s ratio were manufactured by using the Fortus 380 mc printing rapid prototyping equipment instead of the traditional manufacturing process,and the relevant mechanical experiments were carried out.From an experimental point of view,the mechanical properties of the new three-dimensional honeycomb structure with negative Poisson’s ratio are analyzed and compared with the calculated results of the established finite element model,which verifies the previous simulation conclusion and provides the basis and reference for the subsequent related research.(4)The new type of three-dimensional negative Poisson’s ratio structure is applied in practical engineering.Different structures are analyzed by static and dynamic analysis.By analyzing the structural displacement,equivalent yield value,stress distribution nephogram,concrete failure and other indicators,it is concluded that the new type of negative Poisson’s ratio honeycomb structure is more suitable for the scene under dynamic impact load.