This paper presents an efficient method for the finite element analysis of shell structures using feature-fitted local shell meshes that are placed in a global shell mesh. Feature-fitted local shell meshes are independently constructed to accurately represent the geometric features of shell structures. Non-matching interfaces between global and local shell meshes are connected by interface shell elements with an arbitrary number of nodes on the element sides. Assumed covariant strains are used to alleviate the shear and membrane locking phenomena in interface shell elements. Numerical results show that more accurate solutions near the geometric features of shell structures can be obtained from feature-fitted shell meshes compared to those from conventional shell meshes composed of mixed-typed shell elements.

本文提出了一种使用放置在全局壳网格中的特征拟合局部壳网格对壳结构进行有限元分析的有效方法。独立构建特征拟合的局部壳网格，以准确表示壳结构的几何特征。全局壳网格和局部壳网格之间的不匹配界面通过界面壳单元与单元侧任意数量的节点连接。假设的协变应变用于减轻界面壳单元中的剪切和膜锁定现象。数值结果表明，与由混合型壳单元组成的传统壳网格相比，特征拟合壳网格可以获得更接近壳结构几何特征的精确解。