凸型加筋锥柱结合壳深水爆炸失稳特性研究

为研究凸型加筋锥柱结合壳结构在深水爆炸载荷作用下的动力学响应以及在此过程中伴随的失稳特性，采用ABAQUS有限元软件中的声固耦合算法开展了300 ~500 m水深条件下深水爆炸数值模拟研究，基于结构挠度变化的失稳判据，分析总结了加筋锥柱结合壳的失稳模式，获得了加筋锥柱结合壳临界失稳载荷和临界失稳挠度随水深和壳体结构参数的变化规律. 结果表明，水深条件、壳体半径、壳体厚度以及结构锥角对结构稳定性有较大影响，而腹板厚度对结构的稳定性影响不大. 在此基础上，运用量纲分析的方法结合模拟得到的临界失稳数据建立了结构在常见失稳模式下结构临界失稳判据的计算公式. 

Instability Study on Deep-Underwater-Explosion of Convex Ring-Stiffened Cone-Cylinder Combined Shell

The dynamic response process and the instability of convex ring-stiffened cone-cylinder combined shell with the deep-water explosion load in the range of 300~500 m depth was obtained by ABAQUS numerical simulation method. Based on the stability criterion of the structural deflection change, the critical instability load and deflection of the cone-cylinder combined shell under different parameter conditions was summarized and the factors affecting the stability of ring-stiffened cone-cylinder combined shell were evaluated. The results show that there are three different instability mode with different structure dimension parameters, and the water depth conditions, the shell radius, the shell thickness, and the cone angle of the ring-stiffened cone-cylinder combined shell have a great influence on structural stability, while the thickness of the ribs has little effect on the structure stability. Finally, a calculation formula for structural critical instability in common instability mode is established by dimensional analysis.