聚氨酯/聚乙烯水袋无伞空投跌落仿真

Numerical Investigation of Free Drop of Polyurethane/Polyethylene Water Bag

基于Abaqus软件中的拉格朗日-欧拉耦合算法,对一种双层聚氨酯/聚乙烯水袋50 m高空无伞空投跌落冲击过程进行数值仿真,并对聚乙烯材料的厚度进行参数化研究。重点分析水袋以水平、垂直和45°倾斜姿态冲击地面时袋体的瞬态应力、位移变化以及破损情况。通过与已有实验数据的对比验证了该数值方法的有效性。仿真结果表明,2 mm聚乙烯/0.5 mm聚氨酯层可以抵御水平姿态冲击但无法抵御垂直姿态冲击,水体对袋体侧面的剧烈拉伸是引起水袋破裂的主要原因。进一步优化发现,4 mm聚乙烯/0.5 mm聚氨酯层可以抵御水袋沿水平、垂直及45°倾斜姿态冲击地面,保证水袋的跌落安全性。结果表明,本文的计算方法可以应用于针对无伞空投的液体及固体食品包装材料的参数化设计。

Based on the Lagrange-Euler coupling algorithm of Abaqus software,the free drop impact process of a double-layer polyurethane/polyethylene water bag at an altitude of 50 m is numerically simulated,and the thickness of the water bag is parameterized analyzed.In specific,the transient stress,displacement and damage characteristics of the water bag under horizontal,vertical,and 45°directions hitting ground are studied.The results show that 2 mm polyethylene/0.5 mm polyurethane layer configuration can resist horizontal drop but cannot resist vertical drop.Severe stretching from water to the bag is the main cause for the rupture.Further optimization find that 4 mm polyethylene/0.5 mm polyurethane layer can resist the impact of the water bag no matter it is under horizontal,vertical or 45°posture,ensuring the safety of the water bag.The above results indicate that the proposed method can be applied to the parametric design of liquid and solid food packaging materials.