Abstract This paper experimentally studied the dynamic mechanical and energy absorption responses of three types of samples: single-layer hexagonal aluminum honeycomb, and combined hexagonal aluminum honeycombs at two stacking angles (0° and 90°). The combined honeycombs are composed of two-layered and non-partitioned honeycombs. Dynamic experiments were conducted using a high-pressure gas-gun testing system at impact velocities of 30–70 m/s. Results showed that dynamic response of combined honeycombs mainly included cutting and buckling processes. The cutting plateau stress increased at a higher rate increased with impact velocity, but reached a lower final value in the 0°-layered honeycombs than in the 90°-layered honeycombs. The buckling plateau stress of the two combined honeycombs were almost equal, and approximately 1.5–2 times of their quasi-static values. Besides, a dimensionally consistent empirical formula was proposed to describe the effects of the honeycomb density and strain rate on the plateau stresses. It concluded that the energy absorption capacity was highest in the 90°-layered honeycombs and lowest in the single-layer honeycomb. Finally, the energy absorption mechanisms of the two combined honeycombs were discussed.

中文翻译：

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动态冲击作用下组合六角铝蜂窝面外力学吸能性能试验研究

摘要 本文通过实验研究了三种样品的动态力学和能量吸收响应：单层六边形铝蜂窝和两种堆叠角度（0°和90°）的组合六边形铝蜂窝。组合蜂窝由两层和不分区的蜂窝组成。使用高压气枪测试系统在 30-70 m/s 的冲击速度下进行动态实验。结果表明，组合蜂窝体的动力响应主要包括切割和屈曲过程。随着冲击速度的增加，切割平台应力以更高的速率增加，但在0°层状蜂窝中达到的最终值低于90°层状蜂窝中的最终值。两个组合蜂窝体的屈曲平台应力几乎相等，约为1。其准静态值的 5-2 倍。此外，提出了尺寸一致的经验公式来描述蜂窝密度和应变率对平台应力的影响。结果表明，90°层状蜂窝的能量吸收能力最高，而单层蜂窝的能量吸收能力最低。最后，讨论了两种组合蜂窝的能量吸收机制。