摘要
Gurson模型要求材料的静水应力或等效应变无穷大时才能实现材料内部的空洞闭合,而这一条件并不符合实际情况。文章对Gurson模型中的各参数进行了试验设计,通过开发子程序,对不同试验参数下的空洞体积变化过程进行了模拟仿真,据此获得了修正的Gurson模型参数,从而将其应用于大锻件锻造过程的空洞体积变化模拟中。结果表明,修正后的Gurson模型给出的空洞体积变化率,与直接设置空洞的有限元模拟结果很接近,从而大大改善了空洞闭合的预报结果。
Infinite hydraulic stress or equivalent strain is required when Gurson Model is employed to realize void closure of materials. However, such condition does not conform to reality. This paper brings forward modified parameters of Gurson Model by Orthogonal experimental design and simulation under different sampling parameters through embedded subroutine. Consequently, the modified Gurson model can be applied to simulate void volume variation in heaving forgings. The results demonstrate that the void volume change rate values are quite close to those obtained by an artificial model, which implies that the predictions of void closure are greatly improved.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2009年第3期78-83,共6页
Journal of Plasticity Engineering
基金
国家重点基础研究发展计划(973)资助项目(2006CB705401)
