【摘要】 对爆炸荷载下圆柱壳的动力学行为进行了实验研究及数值模拟。将外径均为100mm的3种壁厚的Q235钢质圆柱壳置于由TNT药柱产生的爆炸场中进行冲击实验,系统分析了在不同装药高度及壳壁厚度参数条件下圆柱壳的冲击变形模式,即迎爆面局部凹陷变形模式(ModeⅠ)、迎爆面局部凹陷与壳整体弯曲变形耦合模式(ModeⅡ)、整体变形失效模式(ModeⅢ)及局部穿透与整体变形失效耦合模式(ModeⅣ)。采用LS-DYNA有限元程序及Lagrangian-Eulerian流固耦合算法,对圆柱壳的非线性动力响应过程进行了数值模拟,分析了圆柱壳的变形历程及最终残余变形的情况,计算结果与实验现象吻合较好。研究结论可为圆柱壳结构爆炸破坏分级及抗爆技术设计提供科学依据。更多还原

【Abstract】 Experimental and numerical simulation researches were presented on dynamical behaviors of cylindrical shell structure affected by lateral explosion loading.Impact experiments of explosion loading caused by cylindrical TNT charge on the Q235 steel cylindrical shells with different wall-thicknesses were carried out.The deformation modes of cylindrical shells were analyzed under explosion conditions with different charges and stuctures.These deformation modes include local dent mode(ModeⅠ),coupling of local dent and whole bending mode(Mode Ⅱ),whole strcture collapse mode(Mode Ⅲ)and coupling of local perforation and whole strcture collapse mode(Mode Ⅳ).By means of the 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 cylindrical shells and the final modes were described.The numerical simulation results are in good agreement with experimental data.The results provide a reference for the classification of explosion damage and the design of explosion-resisting structures.更多还原