The low-velocity impact behavior of polypropylene- core-based sandwich composites reinforced with basalt/epoxy facesheets was investigated by drop-weight impact tests. The impact resistance of composite samples was characterized for various impact energies according to ASTM standards. Also, the effect of facesheet thickness was explored, and the failure and fracture surfaces around the impacted region were analyzed. It was found that the thickness of facesheets played an important role in the impact properties of the honeycombs. Their residual deformation after the impact tests increased as the impact energy grew, but decreased when the number of facesheet layers increased with reducing the penetration depth and perforation.

中文翻译：

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玄武岩纤维/聚丙烯芯蜂窝夹芯复合材料的低速冲击试验

通过落锤冲击试验研究了玄武岩/环氧树脂面板增强的聚丙烯芯夹层复合材料的低速冲击行为。根据 ASTM 标准，针对各种冲击能量表征复合材料样品的抗冲击性。此外，还探讨了面板厚度的影响，并分析了受影响区域周围的失效和断裂表面。结果表明，面板的厚度对蜂窝的冲击性能起着重要作用。它们在冲击试验后的残余变形随着冲击能量的增加而增加，但随着面板层数的增加，随着穿透深度和穿孔的减少而减少。