This paper presents an experimental and numerical study of the low-velocity impact on foam core sandwich panels reinforced using hybrid short fibers. The foam cores were reinforced with carbon, aramid and carbon-aramid hybrid short fibers. The face-sheets were made of two layers of glass/epoxy, and foam cores were made of two-part polyurethane. In order to acquire the appropriate weight ratio between foam and short fibers, the weight percentage of 10% was chosen for short fibers. Comparing the experimental results proved that carbon, aramid, and carbon-aramid respectively had a better effect on increasing Young modulus by around 100 to 180 per cent. Before performing impact tests, indentation tests were conducted and based on the results for the parameter of impact energy, the value of 6 J was chosen. According to the results of impact tests and the maximum contact force, hybrid reinforced foam, aramid short fiber reinforced foam and carbon short fiber reinforced foam improved the properties respectively by 18 to 30 per cent in comparison to non-reinforced foam. Furthermore, numerical simulations were conducted via ABAQUS. After modeling face-sheet and foam separately, and verifying the results with experiments, the sandwich panel was modeled entirely while the simulation difference of 9.1% on average with the experiment results was concluded.

本文介绍了对使用混合短纤维增强的泡沫芯夹芯板的低速影响的实验和数值研究。泡沫芯由碳、芳纶和碳-芳纶混合短纤维增强。面板由两层玻璃/环氧树脂制成，泡沫芯由两部分聚氨酯制成。为了获得合适的泡沫与短纤维的重量比，短纤维的重量百分比选择为10%。比较实验结果证明，碳、芳纶和碳-芳纶分别对杨氏模量提高约 100% 至 180% 具有更好的效果。在进行冲击试验之前，进行了压痕试验，并根据冲击能量参数的结果，6 J的值 被选中。根据冲击试验和最大接触力的结果，混合增强泡沫、芳纶短纤维增强泡沫和碳短纤维增强泡沫与非增强泡沫相比，性能分别提高了18%至30%。此外，数值模拟是通过 ABAQUS 进行的。分别对面板和泡沫进行建模，并通过实验验证结果，对夹芯板进行了整体建模，得出的模拟结果与实验结果平均相差9.1%。