利用落锤冲击试验系统，研究了金属蜂窝夹芯板在低速冲击载荷作用下的抗侵彻行为。实验获得了平头、半球形和锥形锤头冲击下蜂窝夹芯板的破坏模式和力-位移曲线，分析了锤头形状和芯材厚度对夹芯板最终破坏模式、力-位移曲线和临界破坏能量的影响。实验结果表明：夹芯板在平头、半球形和锥形锤头冲击下上面板分别产生了圆形剪切、圆形拉伸和钻石形的最终失效模式，下面板的最终失效模式分别为圆形剪切、瓣形开裂和瓣形开裂；金属蜂窝夹芯薄板在锥头和半球形锤头冲击下的力-位移曲线会出现“单峰”模式，金属蜂窝夹芯厚板在锥头和半球形锤头冲击下的力-位移曲线则是“双峰”模式，而在平头冲击下的金属蜂窝夹芯板的力-位移曲线均为“双峰”模式；金属蜂窝夹芯薄板抵抗半球形锤头侵彻的能力最好，抵抗平锤头侵彻的能力最差，而金属蜂窝夹芯厚板抵抗锥形锤头侵彻的能力最好，抵抗平头和半球形锤头侵彻的能力较差。
The penetration behavior of metallic sandwich plates with honeycomb core under low-velocity impact was experimentally studied with the DHR testing system. Impact force-displacement responses of sandwiches with different core thickness under blunt, spherical, conical projectiles impacting were demonstrated. The effects of the core thickness and projectile’s shapes on final fracture modes, impact force-displacement responses and critical fracture energy of sandwiches were analyzed. Experimental results showed that “shear fracture mode”, “tensile fracture mode” and “diamondoid fracture mode” were found on the top face-sheets of sandwich plates when the shapes of the projectiles are blunt, spherical and conical respectively. “Shear fracture mode”, “petaloid fracture mode” and “petaloid fracture mode” were found on the bottom face-sheets of sandwich plates when the shapes of the projectiles are blunt, spherical and conical respectively. “Single peak modes” were found in the impact force-displacement responses during the spherical and conical projectile loading on the thin sandwich plates, while “double peaks modes” occurred when the sandwich plates were thick. Both the thin and thick sandwich plates under blunt projectile impact, the impact force-displacement responses accorded with “double peaks modes”. The ability against perforation of the thin sandwich plates appeared to be the best under spherical projectiles impacting, while the worst under blunt projectiles impacting. The ability against perforation of the thick sandwich plates appeared to be the best under conical projectiles impacting, while poorer under blunt and spherical projectiles impacting.
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