拟协调九结点四边形层合板壳有限元

A Quasi-Conforming Nine-Node Quadrilateral Finite Element for Multi-Layered Composite Plates and Shells

构造了一个拟协调九结点四边形层合板壳单无，这一单元是根据Ｈｕ－Ｗａｓｈｉｚｕ变分原理导出的，独立假设了位移场、每一层的应变场和应力场。文中计算了复合材料板和充实例。计算结果表明，本文单元在准确性和高效率方面的性态较好。

A quasi-conforming nine-node quadrilateral finite element for multi-layered composite plates and shells is presented. This finite element is derived on the basis of the Hu-Washizu variational principle with independently assumed displacement fields, laminated interal strain fields and stress fields. Several problems of composite plates and shells are computed. The computed results show that the present element's performance is good in accuracy and efficiency.