塑性厚壁球壳分析的三维组合格式

A Three-Dimensional Combined Scheme in Plasticity Analysis of Tnick-walled Spherical Shell

本文由修正的增量型π_R变分泛函出发,按照杂交/混合有限元法、粘塑性理论,采用力学子单元模型,组成了由12节点三维六面体过渡元为中介的8-12-20节点三维六面体杂交/混合有限元组合格式。三维厚壁球壳受均匀内压的塑性分析工作说明,采用组合格式并辅以合适数目的高斯积分点,在同等计算精度条件下,计算机开支(CPU)约可节省34％。

A 3-d combined scheme of hybrid/mixed brick elements with 8, 12, and 20 nodes is developed for the plasticity analysis of thick-walled spherical shell. The present work features: starting from a modified incremental π_R-type functional, and applying visco-plasticity theory and the hybrid/mixed finite element methodology to a mechanical subelement model for strain-hardening material. Demonstrated via the present study is the effectiveness of the scheme in furnishing access to an enhancement amounting nearly 34% in computer efficiency with required numerical accuracy when appropriate number of Gaussian stations is provided.