充液圆柱壳轴向冲击屈曲的实验研究与计算机数值模拟

借助落锤装置实现冲击加载，完成了一组充满水的金属薄壁圆柱壳试件轴向冲击屈曲过程的实验研究，同时利用LS－DYNA大型动力软件对冲击屈曲的全过程进行了计算机模拟，对于屈曲模态发展过程以及冲击力和液压的动态时程曲线，实验观察和数值结果均表现出较好的一致性，研究表明，在撞击过程中壳内形成很大的液体压力，在此内压和轴向压缩的联合作用下，壳壁发生轴对称塑性屈曲，屈曲模态为一系列依次发展的环带波纹。

EXPERIMENTAL INVESTIGATION AND COMPUTER SIMULATION ON DYNAMIC BUCKLING BEHAVIOR OF LIQUID-FILLED CYLINDRICAL SHELLS UNDER AXIAL IMPACT

An experimental investigation on the axial impact buckling of thin metallic cylindrical shells fully filled with water is presented. Low velocity impact tests are carried out by DHR 9401 drop hammer rig. The whole process of dynamic buckling is simulated using LS DYNA computer code. The consistency between experimental observation and numerical simulation is quite satisfactory. The investigations indicate that quite high internal hydrodynamic pressure occurs inside shell during impact process. Under the combination action of the high internal pressure and axial compression the thin walled shells undergo plastic buckling with buckling modes of regular and axisymmetric wrinkles.