发泡聚丙烯动态缓冲性能分析

目的研究发泡聚丙烯材料的动态缓冲特性。方法对发泡聚丙烯材料进行动态压缩试验,分析密度、厚度、跌落高度对发泡聚丙烯动态缓冲性能的影响。结果发泡聚丙烯密度越大,动态压缩特性曲线最低点对应的加速度和静应力越大,最小缓冲系数越大。发泡聚丙烯厚度越大,曲线最低点对应的最大加速度越小,对应的静应力越大。随着跌落高度的增加,曲线最低点对应的最大加速度逐渐增加,静应力逐渐减小。结论在安全范围内,考虑到轻量化和成本因素,选择缓冲材料时需要综合考虑材料的密度、厚度以及实际的运输环境。

Analysis on Dynamic Cushioning Property of Expanded Polypropylene Materials

The work aims to study the dynamic cushioning property of expanded polypropylene materials. Dynamic compression test was carried out to the expanded polypropylene materials and the effects of densities, thickness and drop height on dynamic cushioning property of expanded polypropylene were analyzed. The higher the density of expanded polypropylene was, the greater the acceleration and static stress corresponding to the lowest point of the dynamic cushioning property curve were, and the greater the lowest point of the buffer coefficient was. The thicker the expanded polypropylene was, the smaller the maximum acceleration at the lowest point of the curve was and the greater the static stress was. With the increases of drop height, the maximum acceleration corresponding to the lowest point of the curve increased, but the static stress decreased. For the weight reduction and cost saving, the polypropylene materials should be selected within a safe range with reference to density, thickness and actual transportation environment of materials.