夹芯圆柱壳在水下爆炸载荷作用下的抗冲击特性

采用声固耦合方法对夹芯圆柱壳和等质量的普通圆柱壳在爆炸载荷作用下的应变、速度和加速度进行有限元计算。结果表明:夹芯防护层对爆炸冲击波可起到较好的衰减作用，即通过芯层的塑性变形，耗散了冲击过程中产生的大部分能量，对里面的圆柱壳体起到较好的保护作用，由于夹芯防护层的存在，与等质量的普通圆柱壳相比，夹芯圆柱壳能够承受更强的爆炸冲击波，降低结构的整体变形。

Shock-resistance characteristics of sandwich cylindrical shells subjected to underwater explosion

By considering acoustic－structure coupling, the strains, velocities and accelerations were calculated by the finite element method for the sandwich cylindrical shells as well as the common cylindrical shells having the same mass.The calculated results for the common cylindrical shells are consistent with the existent experimental results.Comparisons show that the sandwich protective layer can greatly reduce the intensity of the explosion shock wave.Resulted from the plastic deformation of the sandwich core, the explosion shock energy endured by the sandwich cylindrical shells are mostly dissipated.So the cylindrical shells in the sandwich layers can be protected.Compared with the common cylindrical shells, the sandwich layers can make the sandwich cylindrical shells endure stronger shock waves for the cylindrical shells with the same mass.Therefore, the outer sandwich layers can give a protection for the inner structures, and the sandwich cylindrical shells have good shock－resistance characteristics.