研究了EPE和EVA两种发泡缓冲材料在动态冲击下的吸能特性。将落锤冲击试验得到的载荷位移数据进行处理，绘制得到了动态应力-应变曲线和动态能量吸收曲线，并重点讨论了材料厚度、密度和多次冲击等因素影响下的曲线特征。结果表明，密度和多次冲击对吸能特性影响显著。研究结论为产品包装材料合理选择和优化设计提供科学依据。

The energy absorption characteristics of EPE and EVA were investigated under action of dynamic impact. The load and displacement data of impact test was processed and the dynamic compression stress-strain curves and energy absorption curves were plotted. The effect of material thickness, density and repeated impact on the curves was discussed. It was showed that the density and repeated impact are noticeable. The purpose was to provide reference for selection of packaging materials and optimization design.