充液及内空圆柱壳在爆炸荷载下动力屈曲特性研究

采用实验与数值模拟相结合方法，对充液及内空圆柱壳在爆炸载荷下动力屈曲响应特性进行对比研究。将壁厚δ=2.0 mm、外径Φ=100 mm钢圆柱壳（内空及充水）置于75gTNT药柱、200gTNT药柱产生的爆炸场中进行冲击实验，获得不同工况下圆柱壳变形破坏模式。利用动力有限元程序LS-DYNA及Lagrangian-Eulerian流固耦合方法进行数值计算，分析壳壁屈曲变形过程及壳壁关键点速度、水介质内压力等动态参数。计算结果与实验结果一致性较好。研究表明，由于内充水介质的近似不可压缩性，承受冲击荷载时内压增大，因而参与对外界爆炸冲击载荷抗力作用，圆柱壳抗爆能力显著提高。

Research on dynamic buckling of liquid-filled and hallow thin-wall cylindrical shells subjected to explosion loading

Experimental and numerical simulation investigations were carried out on the dynamic buckling response of the liquid-filled and hallow thin-wall cylindrical shells subjected to lateral explosion loading. Impact experiments of explosion loading caused by 75g and 200g TNT charge on the steel cylindrical shells were carried out. The deformation modes of cylindrical shells were obtained under different explosion conditions. By means of an finite element computer code LS-DYNA，the nonlinear dynamic response process of the cylindrical shells subjected to explosion loading were numerically simulated with Lagrangian-Eulerian coupling method. The deformation process of the shell-wall，the time history of the velocities of some key nodes on the cylindrical shell and internal pressure of water were described. The numerical simulation results were in good agreement with experimental data. The results show that internal pressure of water will increase when subjecting to impact loading because of the incompressibility and liquid-filled cylindrical shells have better impact resistance than the hallow cylindrical shells.