摘要
利用有限元软件ANSYS-LSDYNA研究了负泊松比蜂窝结构面内冲击动力学特性。在壁长和相对密度不变的前提下,建立了负泊松比蜂窝模型;通过改变胞元扩展角,讨论了冲击速度对蜂窝材料面内冲击变形模式和能量吸收能力的影响。数值研究发现,冲击载荷作用下负泊松比蜂窝结构的面内冲击性能更多依赖于冲击速度。提高冲击速度,冲击端的峰值应力、平台应力、试件的比吸能均增高;但在相同冲击速度下,冲击端和支撑端的峰值应力、平台应力、试件的比吸能均随胞元扩展角的增大而降低。
The in-plane dynamical mechanics behaviors of honeycombs with negative Poisson's effect are numerically studied by using finite elements software ANSYS-LSDYNA. Assuming that the edge length and the relative density are all the same, the finite elements models of honeycomb with the negative Poisson's effects are established. The influence of impact velocity on the in-plane crushing deformation and the energy absorption with different cell expanding angle are discussed. Numerical studies show that the dynamical properties of honeycomb under in-plane impact loading are more dependent on impact velocity. The peak stress and plateau stress at the impact end and the specific energy absorption increase with the increasing of impact velocity. And the peak stress and plateau stress at both ends and the specific energy absorption decrease with the increasing of the cell expanding angle under the same impact velocity.
出处
《应用力学学报》
CSCD
北大核心
2017年第5期919-924,共6页
Chinese Journal of Applied Mechanics
基金
中国博士后科学基金面上资助(2015M571944)
中央高校基本科研业务费专项资金资助(WK2480000002)
安徽省自然科学基金(1408085ME84)
关键词
蜂窝
负泊松比
面内冲击
能量吸收
honeycomb
negative Poisson's effect
in-plane impacting
energy absorption
作者简介
崔世堂，男，1978年生，博士，中国科学技术大学，副研究员；研究方向——材料动态力学行为。;通讯作者：张科，E-mail：zhangke@ustc．edu．cn
