Development of Energy Absorbing Light-Weight Honeycomb Cell Structure by Crushing and Fracture

本研究旨在开发蜂窝状蜂窝结构，通过蜂窝的破碎和破碎，使蜂窝结构具有较高的吸收冲击能量的能力。主要研究结果如下：(1)弹丸破损与侵彻预测：在侵彻模拟中，当尖边锥弹侵彻薄铝膜时，用极限等效断应变准则可以预测破甲与侵彻现象。破碎现象预测：用显式动力有限元方法对蜂窝结构的吸能现象进行了模拟，并与铝蜂窝结构的破碎实验结果进行了比较。(3)薄板蜂窝结构的吸波能力：制作了薄板蜂窝结构，并进行了实验验证。研究发现，蜂窝状蜂窝结构的破碎伴随着弹丸的薄板断裂，对能量吸收有很大的影响。通过有限元的挤压和制动仿真，对其吸能效果进行了预测。

This research has been done to develop honeycomb cell structures which have high absorbing capability of impact energy by crushing and fracturing of cells. The obtained results are summarized as follows :(1)Breaking and penetration prediction of projectile : When a cone projectile with sharp edge penetrates a thin aluminum film, it has been found that cracking and penetrating phenomena can be predicted by the criterion of limit equivalent breaking strain in the penetration simulation. The phenomena have also been confirmed by the experiments.(2)Crushing phenomena prediction : The energy absorbing phenomena of honeycomb cell structures have been simulated by the explicit dynamic finite element method, and the simulated results of absorbing energy as well as folding phenomena have been compared with that of crushing experiment of aluminum cell structures.(3)Absorbing capability of honeycomb cell structure with sheet : Honeycomb cell structures with thin sheets has been fabricated and tested by the experiments. It has been found that there is much effect for energy absorption when the crushing of honeycomb cell structures accompany the sheet fracture by the projectile. The energy absorbing effects have also been predicted by the crushing and braking simulation of FEM.