聚乙烯泡沫缓冲系统跌落冲击过载仿真分析

目的将聚乙烯泡沫静态压缩特性引入有限元中创建材料,并应用于跌落冲击进行过载仿真分析。方法通过聚乙烯泡沫静态压缩实验,得到材料真实应力-应变曲线,并引入基于Ansys的Crushable Foam模型,最后仿真分析聚乙烯泡沫缓冲系统的跌落冲击过载,并与跌落实验结果进行对比分析。结果聚乙烯泡沫缓冲系统的仿真冲击加速度曲线与跌落实验曲线趋势基本吻合。结论基于Crushable Foam模型的聚乙烯泡沫静态压缩性能的引入可行、有效,并为非线性缓冲系统有限元分析提供了参考价值。

Simulation and Analysis of Dropping Impact Acceleration of Polyethylene Foam Buffer System

The work aims to create polyethylene foam material in the finite element by introducing its static compressive property and apply it to the simulation and analysis of dropping impact acceleration. The actual stress-strain curve of the material was obtained by static compressive test of polyethylene foam and used in Crushable Foam model via Ansys. Finally the dropping impact acceleration of polyethylene foam buffer system was simulated and analyzed, and compared to dropping test results. Simulation impact acceleration curve of polyethylene foam buffer system was consistent with dropping test curve on the whole. It is feasible and effective to introduce the static compressive property of polyethylene foam based on Crushable Foam model, and the reference value is provided for the finite element analysis of nonlinear buffer system.