Abstract The arbitrary Lagrange Euler (ALE) finite element method was used to simulate deformation and damage to a cylindrical shell-water-cylindrical shell (CWC) structure subjected to underwater explosion (UNDEX) loading. The experimental and computational results were in agreement, illustrating the validity of the computational scheme in complex fluid-structure interaction problems involving metals subjected to UNDEX loading. The dynamic process of UNDEX loading can be divided into four stages based on the deformation of and damage to the CWC structures. It was found that increasing the wall thickness of the inner and outer tubes and the thickness of the water sandwich significantly enhanced the overall protection provided by the CWC structure during UNDEX loading. When the sandwich was incompletely filled with water, the inner tube of the structure wrinkled owing to the large pressure difference between water and air at the interface of the sandwich. At a specific water-filled ratio, the large pressure difference inside the sandwich provided aggravated the deformation and damage of the CWC structure.

中文翻译：

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水下爆炸荷载作用下CWC结构动力响应的数值研究

摘要 采用任意拉格朗日欧拉（ALE）有限元方法模拟了水下爆炸（UNDEX）载荷作用下圆柱壳-水-圆柱壳（CWC）结构的变形和损伤。实验和计算结果一致，说明了计算方案在涉及金属承受 UNDEX 载荷的复杂流固耦合问题中的有效性。UNDEX加载的动力过程根据CWC结构的变形和损伤可分为四个阶段。结果表明，增加内外管壁厚和水夹层厚度，显着增强了 CWC 结构在 UNDEX 加载期间提供的整体保护。当三明治没有完全装满水时，由于夹层界面处的水和空气之间的巨大压差，结构的内管起皱。在特定的充水比下，夹层内部产生的大压差加剧了CWC结构的变形和破坏。