微拓扑参数下双箭头-三星型复合微结构面内冲击性能研究

In-Plane Impact of Double Arrow-Tristar Composite Cellular Structure with Negative Poison’s Ratio under Topological Parameters

本文以双箭头-三星型复合负泊松比微结构为研究对象,首先采用准静态压缩试验对模型可靠性进行了验证.其次,采用有限元软件HyperWorks和显式动力学软件LS-DYNA详细分析了微拓扑参数和冲击速度对其面内冲击变形模态和吸能特性的影响.研究表明,在冲击载荷作用下,该复合微结构的面内冲击动力学性能依赖于微元胞夹角和胞壁厚度参数,冲击速度越大,吸能量越大,且随着微元胞夹角的减小以及胞壁厚度的增大,其平台应力和吸能特性表现更加优异,该研究对车辆吸能件的设计具有重要的指导意义.

A novel double arrow-tristar(DAT)composite cellular structure with negative Poisson’s Ratio has been taken as research object.Firstly,the reliability of the finite element(FE)model is verified by quasi-static compression test.Secondly,FE software HyperWorks and dynamic explicit software LS-DYNA are utilized to analyze the influences of structural parameters and impact velocities on in-plane impact deformation modes and energy absorption properties.The results indicate that the in-plane impact dynamic performances of this cellular structure depend on cellular angle and cell wall thickness.The larger the impact velocity is,the greater the energy absorption is.In addition,with the decrease of cellular angle and the increase of cell wall thickness,the higher platform stress and more outstanding energy absorption performance can be achieved.This research provides guiding significance for the design of vehicle energy absorber.