Shock-resistance characteristics of sandwich cylindrical shells subjected to underwater explosion
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摘要: 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。Abstract: 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.
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图 5 夹芯圆柱壳的有限元计算结果
Figure 5. Finite element simulation results of the sandwich cylindrical shells
图 11 夹芯圆柱壳塑性能量耗散曲线
Figure 11. Histories of plastic energies dissipation on sandwich cylindrical shells
图 12 夹芯圆柱壳动能时程曲线
Figure 12. Histories of kinetic energies on sandwich cylindrical shells
表 1 夹芯圆柱壳结构参数
Table 1. Structural parameters of sandwich cylindrical shells
L/m L1/m R/m R1/m m n t/mm t1/mm tt/mm tb/mm tc/mm 1.067 0.419 0.152 5 0.182 5 31 26 4.5 20 1 0.5 0.5 
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表 2 圆柱壳表面速度绝对值最大值
Table 2. The maximum absolute value of velocity on cylindrical shell
测点 vx/(m·s-1) 普通圆柱壳 夹芯圆柱壳 A1 22.51 13.89 B1 20.91 17.42 C1 22.50 13.86
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表 3 圆柱壳表面加速度绝对值最大值
Table 3. The maximum absolute value of velocity on cylindrical shell
测点 ax/(m·s-2) 普通圆柱壳 夹芯圆柱壳 A1 942 253 288 764 B1 980 023 375 062 C1 933 984 304 533
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