ELASTIC-PLASTIC DYNAMIC BUCKLING OF SADDLE-SHAPED BULKHEAD UNDER BLAST IMPACT LOADING
Li Rongfu1 Cheng Yuansheng1 Wang Yu2 Zeng Guangwu1
1.School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan, Hube 430074;2.Naval Research Center, Beijing 100073
Abstract:The elastic-plastic dynamic buckling properties of saddle-shaped bulkhead under blast impact loading are studied using the finite element software ANSYS/LS-DYNA. The Budiansky-Roth buckling criterion is utilized to judge the dynamic buckling of saddle-shaped bulkhead, and the effect of initial imperfection amplitude on dynamic buckling of saddle-shaped bulkhead is analyzed and compared with the traditional domed bulkhead which has the same weight, and then the effects of main designing parameters on dynamic buckling of saddle-shaped bulkhead are discussed. The results indicate that the dynamic buckling load of saddle-shaped bulkhead is highly enhanced compared with the traditional domed bulkhead which has the same weight and is insensitive to initial imperfection. The optimal dynamic buckling property will be achieved if design parameters are properly selected.