冲击载荷下柔性储液罐动态响应数值模拟及规律分析

Dynamic analysis of flexible containers under impact

针对柔性材料大变形、非线性等特点,对柔性储液罐的冲击响应规律进行研究,依据实验结果,采用ALE有限元方法对冲击情况下柔性罐状储液容器及其中流体的动态响应进行了数值模拟。所得结果与实验结果具有较好的一致性。在此基础上,深入分析了空投高度、装水量等对柔性储液罐动态响应的影响规律。重点关注了表面一些关键部位的变形和应力变化情况。结果表明,柔性储液罐的动态应力和变形均与抛落高度成正比。但表面最大应力与装水量呈"V"型关系。

To understand and improve the crashworthiness of flexible containers,the dynamic behaviors of the container under impact loading were numerically simulated.The water movement and sloshing in the container were modeled by using the ALE method.The interaction between the container and fluid was studied by applying the penalty method.The model and approaches were validated by comparing numerical results with experimental data.Based on the above investigation,numerical simulation was performed to explore the influences of drop height and water quantity on the dynamic response of the container.And the deformation and stress distribution at the key positions were analyzed.Results display that the shoulder of the container is the most vulnerable part during impact;that both drop height and water quantity have great effects on the crashworthiness of the container;that the maximum dynamic stress of the container is proportional to drop height and there lies a V-shaped relation between the maximum dynamic stress and water quantity.