目的 基于有限元法对发泡聚乙烯（EPE）缓冲包装材料的力学性能进行分析。 方法 基于有限元法研究缓冲材料的厚度、压板的施压速度对EPE 缓冲包装材料的应力分布及应力应变曲线的变化情况。 结果 随着缓冲材料厚度的增加， 最大应力从1.646 kPa逐渐减小到 0.624 kPa， 材料屈服点的应力从 41.700 Pa 逐渐降低到 14.727 Pa。 随着施压速度的增加， 压板与 EPE 接触边缘的最大应力由1.646 kPa逐渐增大到 8.617 kPa， 应力上升开始点的应力从23.497 Pa逐渐增大到 144.978 Pa。 结论 应力主要分布在压板与缓冲材料接触边缘。 随着缓冲材料厚度的增加， 最大应力逐渐减小。 随着施压速度的增加，压板与 EPE 接触边缘最大应力逐渐增大，且EPE 缓冲材料内部受力区域逐渐增大。

Objective The mechanical properties of expanded polyethylene (EPE) were analyzed based on the finite element method. Methods The stress distribution and the stress-strain variation curves of EPE for different thickness and velocity were explored based on the finite element approach. Results With the increase of thickness of EPE, the maximum stress was reduced from 1.646 kPa to 0.624 kPa and the stress of the yield point was reduced from 41.700 Pa to 14.727 Pa. With the increase of velocity, the maximum stress on the contact edge between the plate and EPE increased gradually from 1.646 kPa to 8.617 kPa and the stress of the rising point increased gradually from 23.497 Pa to144.978 Pa. Conclusion The stress was mainly distributed on the contact edge between the plate and EPE. With the increase of thickness, the maximum stress decreased gradually. With the increase of velocity, the maximum stress on the contact edge between the plate and EPE increased gradually, and the internal stress region of EPE also increased gradually.