王莲仿生梯度蜂窝的面外压缩行为

Out-of-Plane Compression Performance of Gradient Honeycomb Inspired by Royal Water Lily

利用ABAQUS有限元软件对仿王莲脉络分层梯度蜂窝进行准静态与动态压缩数值模拟,分析了其准静态压缩平台应力与相对密度,以及动态压缩强度与相对密度、冲击速度之间的关系。结果表明:当冲击速度较低时(10 m/s),芯层呈现渐进压溃模式;在高速冲击下(200 m/s),芯层压溃模式与梯度分布方式密切相关,初始为渐进压溃模式,当冲击波传播至远端时,各层的压溃和密实化取决于其静态压缩强度,密实化依次出现在压缩强度较低的芯层。

Inspired by the venation of Royal Water Lily leaves,we conducted numerical simulations on the quasi-static and dynamic compression of layered-gradient honeycomb using the finite element software ABAQUS.Then the relationship of the quasi-static compression plateau stress with the relative density,as well as the relationship of the dynamic compressive strength with the relative density and the impact velocity was analyzed.The results show that:the progressive collapse mode appears at a low impact velocity(10 m/s);the collapse mode presents closely related to the gradient distribution at the impact velocity of 200 m/s,and the initial collapse mode just turns to be progressive.When the shock wave propagates to the far end(fixed end),the layer’s collapse and compaction depend on its static compressive strength,and the compaction occurs in the layer with lower compressive strength in turn.