Abstract

Honeycomb structure containing curved reentrant sides with negative Poisson’s ratio (NPR) was designed and the impact dynamics behaviors were studied by finite element method. The Poisson’s ratio and the energy absorption capacity of the honeycomb structure with different arc angle were studied under different compression velocities. The results show that the Poisson’s ratio of the honeycomb structure can reach −0.373 with arc angle of 180°. The energy absorption capacity of the honeycomb structure increased with an increasing compression velocity, and the deformation mode changed from X type to V type and I type. When the compression velocity is low, the dynamic response curve of the honeycomb structure with arc angle of 180° has the characteristics of two-stage plateau region. When the compression velocity is high, the energy absorption capacity of the honeycomb structure increased with an increasing arc angle. When the arc angle is higher than 120°, the honeycomb structure has NPR effect, and the energy absorption capacity of the honeycomb structure is better than the honeycomb structure with other arc angles.

摘要

设计了具有负泊松比(NPR)的弯折边的蜂窝结构，并采用有限元方法研究了冲击动力学行为。研究了不同弧角下蜂窝结构在不同压缩速度下的泊松比和吸能能力。结果表明，蜂窝结构的泊松比可以达到-0.373，圆弧角为180°。蜂窝结构的吸能能力随着压缩速度的增加而增加，变形方式由X型转变为V型和I型。当压缩速度较低时，圆弧角为180°的蜂窝结构的动态响应曲线具有两级平台区的特征。当压缩速度较高时，蜂窝结构的能量吸收能力随着弧角的增加而增加。当圆弧角高于120°时，蜂窝结构具有NPR效应，蜂窝结构的能量吸收能力优于其他圆弧角的蜂窝结构。