加肋凹型锥环柱破坏机理研究

Research on failure mechanics of ring-stiffened concave cone-toroid-cylinder combined shell

采用Ansys有限元软件分析静水压力作用下加肋凹型锥环柱结合壳的受力特点;运用弧长法对其破坏过程进行仿真分析。通过分析锥、环、柱三部分各自位移最大点及环壳两端肋骨的载荷-应力和载荷-位移关系。对加肋凹型锥环柱结合壳的破坏模式和破坏机理进行研究,并对破坏过程中出现环壳中面应力在破坏前卸载和环壳两端肋骨的高应力的现象做出合理的解释。

An analysis by using Ansys is performed to study the stress characteristic of the Ring-stiffened concave cone-toroid-cylinder combined shell under static water pressure. Simulated analysis of its failure process is proceeded through arc length method. Research on failure mode and failure mechanics of Ring-stiffened Concave Cone-toroid-cylinder Combined Shell is studied by analysis of the load-displacement curve and load-stress curve of the nodes with maximum dis-placement, which are from cone, toroid, cylinder and the ribs next to toroid. Reasonable explanation for these phenomenons in the failure process are made that the mid-plane stress of toroid falls back before the destruction and the stress of ribs next to toroid is high.