密度对聚丙烯泡沫材料动态冲击性能的影响

目的 以聚丙烯材料为研究对象，研究密度对其动态冲击性能的影响。方法 对4种不同密度的聚丙烯材料进行动态压缩试验，分析接触力、位移和应变以及吸收能、比吸能的变化，从而研究动态条件下不同密度的聚丙烯材料的动态冲击性能。结果 当密度一定时，最大接触力、最大位移、最大应变、比吸能随冲击能的增大而增大。当冲击能一定时，最大接触力随密度的增大而增大，最大位移、最大应变、比吸能随密度的增大而减小。结论 考虑到轻量化以及成本因素，在安全范围内，选择缓冲材料时可以选择密度较小的聚丙烯材料。

Influence of Density upon Dynamic Crushing Behaviour of Polypropylene Materials

The work aims to study the influence of density of polypropylene material on its impact performance, with the polypropylene material as the study object. The dynamic crushing experiment was conducted on the polypropylene materials of four different densities to analyze the contact force, displacement and strain, as well as the change of absorbed energy and specific energy absorption, thus studying the dynamic crushing behavior of polypropylene materials of different densities under dynamic conditions. With the increasing impact energy, the maximum contact force, maximum displacement, maximum strain and specific energy absorption increased gradually for the given density. When the impact energy was fixed, the maximum contact force increased with the increase of density, while the maximum displacement, maximum strain and specific energy absorption decreased with the increasing density. For the weight reduction and cost saving, it is possible to use the polypropylene material with low densities when selecting the cushioning materials within a safe range.