高弹EPE泡沫两自由度连续冲击包装动力学响应研究

Dynamic Response of Two-degree-of-freedom Continuous Impact Packaging for High Elasticity EPE Foam

目的基于产品在包装运输过程中经常遭受多次跌落冲击,探究两自由度高弹EPE泡沫包装在连续冲击载荷下的动力学响应。方法以密度为34kg/m3的EPE泡沫为研究对象,建立高弹泡沫本构方程,并通过ABAQUS构建两自由度高弹泡沫包装系统有限元模型,并进行有限元模拟。利用ABAQUS中的Hyperform模型和Mullins效应来模拟高弹泡沫产品在连续冲击载荷下的加速度响应。结果通过对比试验和仿真结果可知,两自由度高弹EPE泡沫包装系统在连续冲击下,其产品加速度变化趋势明显,且泡沫的软化效应会降低其缓冲性能。结论在两自由度包装系统中,冲击对底层产品的影响持续时间较长,并且冲击作用会导致泡沫出现软化现象。在泡沫压实阶段,应力会急剧上升。

Considering that products often suffer from multiple drop impacts during packaging and transportation,the work aims to investigate the dynamic response of two-degree-of-freedom high elasticity EPE foam packaging under continuous impact loads.By taking EPE foam with a density of 34 kg/m3 as the research object,the intrinsic equations of high elasticity foam were firstly established,and the finite element model of a two-degree-of-freedom high elasticity foam packaging system was constructed by ABAQUS for finite element simulation.The Hyperform model and Mullins effect in ABAQUS were used to simulate the high elasticity foam and study the acceleration response of the product under continuous impact load.The comparative experimental and simulation results showed that the two-degree-of-freedom high elasticity EPE foam packaging system had a significant trend of product acceleration change in continuous impact,and the softening effect of the foam reduced its cushioning performance.In the two-degree-of-freedom packaging system,the impact on the bottom product lasts for a long time,and the impact effect causes the foam to soften.During the foam compaction phase,the stress rises sharply.