薄壁加筋肋圆柱壳稳定性分析的参数化研究

PARAMETERIZATION STUDY OF ORTHOGRID STIFFENED CYLINDER SHELLS

针对在轴向载荷作用下的正置、正交网格形式的薄壁加筋肋圆柱壳结构,利用有限元程序,对薄壁加筋肋圆柱壳稳定性分析进行了参数化研究,得到了进行结构优化设计的准则,对于给定的设计载荷,当结构参数位于某一个局部失稳与整体失稳的临界区域时,结构的重量最轻.提出了基于有限元分析进行结构优化设计的策略.利用优化策略,获得了一薄壁加筋肋圆柱壳结构的优化设计结果,同时给出了粘合刚度简化模型与有限元计算结果的比较.

The grid shape, skin thickness and stiffener size of a stiffened cylinder shell have a dramatical effect on the buckling loads. To achieve the minimum weight in this kind of structural design, a 3-D finite-element model using ABAQUS software is built. Parameterization study is carried out and general conclusions are drawn. The numerical results show that the axial buckling resistance and the buckling failure modes vary as the stiffener size and the skin thickness change. The buckling resistance reaches the maximum at the critical point where the global buckling failure mode transforms to the local buckling failure mode of the stiffened shell. According to this property, an optimal design strategy for orthogrid stiffened cylinder shells is developed. An example of the optimal design of the grid stiffened cylinder shell presented in the paper shows the validity of the present method.