目的 研究发泡聚丙烯材料的厚度对其冲击性能的影响。方法 对4种不同厚度的发泡聚丙烯材料进行动态压缩试验，分析其接触力、最大位移、最大应变以及吸收能，研究动态条件下发泡聚丙烯材料的力学性能。结果 当冲击能一定时，增加发泡聚丙烯材料的厚度，其接触力会逐渐减小，接触时间会逐渐增加；冲击能和厚度一定时，厚度与最大位移、吸收能成正比例相关，但对最大接触力和最大应变无明显影响；任意厚度的发泡聚丙烯材料，其冲击能和厚度的增加会导致其最大接触力、最大位移、最大应变、吸收能的增加。结论 在研究的冲击能量和厚度范围内，吸收能不受发泡聚丙烯材料厚度的影响，由冲击能决定。

The work aims to study the influence of thickness of expanded polypropylene material on its impact performance. The dynamic compression tests were carried out on four kinds of expanded polypropylene materials with different thicknesses to analyze their contact force, maximum displacement, maximum strain and absorption energy. The mechanical properties of expanded polypropylene material under dynamic conditions were studied. When the impact energy was constant, the contact force would decrease gradually and the contact time would increase gradually as the thickness of the expanded polypropylene material increased. When the impact energy and thickness were constant, the thickness was directly proportional to the maximum displacement and absorption energy, but had no obvious influence on the maximum contact force and maximum strain. The increase of impact energy and thickness of expanded polypropylene material of any thickness would lead to the increase of its maximum contact force, maximum displacement, maximum strain and absorption energy. Within the range of impact energy and thickness studied, the absorption energy is not affected by the thickness of expanded polypropylene material, but is determined by impact energy.