The employment of lightweight structures is one of the most important goals in various industries. The lightweight sandwich panel is an excellent energy absorber and also a perfect way for decreasing the risk of impact. In this paper, a numerical study of high-velocity impact on honeycomb sandwich panels reinforced with polymer foam was performed. The results of numerical simulation are compared with the experimental findings. The numerical modeling of high-velocity penetration process was carried out using nonlinear explicit finite-element code, LS-DYNA. The aluminum honeycomb structure, unfilled honeycomb sandwich panel, and the sandwich panels filled with three types of polyurethane foam (foam 1: 56.94, foam 2: 108.65, and foam 3: 137.13 kg/m³) were investigated to demonstrate damage modes, ballistic limit velocity, absorbed energy, and specific energy absorption (SEA) capacity. The numerical ballistic limit velocity of sandwich panels, filled with three types of foam, was more than that of a bare honeycomb core and unfilled sandwich panel. In addition, the numerical results showed that the sandwich panel filled with the highest density foam could increase the strength of sandwich panel and the numerical specific energy absorption of this structure was 23% more than that of unfilled. Finally, the numerical results were in good agreement with experimental findings.

中文翻译：

---

聚合物泡沫增强蜂窝夹芯板中的高速冲击载荷：数值方法研究

轻型结构的使用是各个行业中最重要的目标之一。轻质的夹心板是一种出色的能量吸收剂，也是降低撞击风险的理想方法。本文对聚合物泡沫增强的蜂窝夹芯板的高速冲击进行了数值研究。数值模拟的结果与实验结果进行了比较。使用非线性显式有限元代码LS-DYNA对高速穿透过程进行了数值建模。铝蜂窝结构，未填充的蜂窝夹心板以及夹心板填充了三种类型的聚氨酯泡沫（泡沫1：56.94，泡沫2：108.65和泡沫3：137.13 kg / m ³）进行了研究，以证明其破坏模式，弹道极限速度，吸收能量和比能量吸收（SEA）容量。填充三种泡沫的夹芯板的数值弹道极限速度大于蜂窝状裸芯和未填充夹芯板的数值。另外，数值结果表明，填充最高密度泡沫的夹芯板可以提高夹芯板的强度，该结构的数值比能量吸收比未填充的高23％。最后，数值结果与实验结果吻合良好。