摘要
在单元内偏应力导数精度分析的基础上，提出了偏应力导数佳点的概念，并通过逐层积分建立了修正的静水压力间接算法．将该方法应用于金属成型过程的弹塑性有限元模拟中，较好地解决了大步长时应力计算精度低的问题，提高了计算效率．算例表明，在变形总量和应变步长都较大的情况下，用该方法计算得到的应力和变形载荷仍具有较好的精度．
Based on the accuracy analysis of deviatoric stress derivatives in an element, this paper presents a concept of superaccuracy location of deviatoric stress derivative, and, by introducing this concept as well as layer by layer integration, establishes a modified method for indirect calculation of hydrostatic stress. The application of the method in the elasto plastic finite element simulation of metal forming process considerably improves the accuracy of stress for the case in which large increments are used, and raises the calculated efficiency. Numerical tests show that the deformation loads predicted by this method are in good precision even when both the deformation increments and total deformation amounts are large.
出处
《固体力学学报》
CAS
CSCD
北大核心
1998年第4期341-346,共6页
Chinese Journal of Solid Mechanics
基金
机械工业部教育司科研基金
关键词
静水压力
弹塑性大变形
有限元
塑性成形
金属
hydrostatic stress, elasto plastic large deformation, finite element
