对轴向冲击圆柱壳局部屈曲及整体失稳的数值模拟分析

摘要

使用有限元程序LS-DYNA对不同加载情况圆柱壳的动力响应进行数值模拟，得到圆柱壳未发生局部屈曲点处的应变。数值模拟结果与实验符合较好。数值模拟所得到的未发生局部屈曲处应变表明：当壳发生局部屈曲时，整个壳的未屈曲部位处于塑性状态，随后壳会发生弹性卸载，并发生弹性振动，直至静止。%The computer simulation on dynamic buckling and whole collapse of cylindrical shell under dif-ferent axial impact was carried out using LS-DYNA.The numerical results and the experimental results showed good agreement.The strains of the points which were located in the middle of the local buckling cylindrical shells were obtained.The strains showed that the local buckling cylindrical shells were in the plastic stage and generated elastic vibration subsequently until standstill.