基于实体壳单元的板壳非线性变形分析

将实体壳单元模型引入显式有限元方法，通过添加12个改善拟应变参数弥补变形缺陷解决闭锁问题，并利用共旋理论和径向返回迭代法更新应力.利用这种基于显式算法的实体壳单元模型对板壳结构非线性变形的标准算例进行计算，并与实体单元及壳单元计算结果进行对比.结果表明,该实体壳单元具有较高的计算精度，可有效地解决板壳非线性大变形分析问题.

Nonlinear Analysis of Plates and Shells Based on Solid-Shell Element

A solid-shell element was introduced into explicit finite element method(EFEM) and locking pathologies were eliminated by employing twelve enhanced assumed strain parameters,which makes up the deformation limitations of solidshell element.Stress was updated through the co-rotational theory and radial return algorithm.Accordingly,a solid-shell element analysis model based on EFEM was developed to account for plates and shells with large deformation.Standard benchmarks were exercised.The results show the high accuracy of the solid-shell element.It also proved the efficiency of the proposed model in dealing with plates and shells exhibiting both large deformation and elasto-plastic behavior.