爆源条件对圆柱壳动力响应及变形模式的影响

Influence of Setting Ways of Explosion Source on Dynamic Response and Deformation Modes of Cylindrical Shells Under blast Load

以壁厚δ=2.75 mm、外径Φ=100 mm的Q235钢质圆柱壳为对象,对其中心部位经受200 g裸装TNT药块爆炸冲击动力响应问题进行了实验研究。系统分析了不同装药设置条件下圆柱壳爆炸变形模式特征,即迎爆面局部凹陷与整体变形耦合模式及局部穿透与整体弯曲变形耦合模式,且装药距离较小或药块长轴线与壳体轴线平行放置情况下壳体损伤程度较大。基于动力有限元程序LS-DYNA及Lagrangian-Eulerian流固耦合方法对圆柱壳的非线性动力响应过程进行数值模拟,计算结果与实验现象吻合良好。得到了圆柱壳的屈曲变形历程,关键单元压力时程曲线和迎爆点的位移、应力和速度时程曲线,分析了200 g TNT装药平行设置时对壳体损伤更大。

To study the dynamic response of the thin cylindrical shell structure affected by setting ways of explosion resource,impact experiments of explosion loading caused by loose-package 200 g TNT charge on the steel cylindrical shells were carried out.The damage characteristics and the deformation modes of cylindrical shells were analyzed.These deformation modes include coupling of local dent and whole bending mode（Mode I） and coupling of local perforation and whole strcture collapse mode（Mode II）.Furthermore,the damage of cylindrical shell is more serious when the charge distance is shorter or the axis of charge is parallel to the axis of cylindrical shell.By means of an finite element computer code LSDYNA,the nonlinear dynamic response process of the cylindrical shells subjected to explosion loading werenumerically simulated with Lagrange-Eulerian coupling method.The numerical simulation results were in good agreement with experimental data.The deformation process of the shell-wall,the displacement,pressure,stress,velocity time curve of some key nodes on the cylindrical shell were described,which indicated that the damage of shell is more serious when 200 g TNT is installed in parallel from the perspective of numerical calculation.