研究了高密度聚乙烯(HDPE)和聚丙烯(PP)变形过程的应变率敏感性和应力松弛行为,实验发现应力松弛行为与应变历史有关.加载过程中的应力松弛表现为应力随时间的增长而减小;卸载过程中应力松弛则表现出不同的现象:在卸载初始阶段,应力逐渐减小并趋于其平衡值,当卸载程度较大,其应力松弛表现为应力随时间逐渐增大并趋向其平衡值.
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