摘要
基于三维Hill’48屈服准则建立了内高压成形的力学模型,将半隐式向后Euler应力更新算法与显式有限元方法相结合,通过用户自定义子程序UMAT将本构模型嵌入有限元软件LS-DYNA中,通过单个单元的拉伸试验对其进行验证,并将本构模型应用于液压胀形过程的数值仿真模拟,与各向同性Mises屈服准则进行了对比分析.结果表明,二次开发的本构模型正确,能够较好地反映管材胀形的变形规律.
Based on the three-dimensional Hi11＇48 anisotropic yield criterion, a mechanical model was devel- oped to describe hydroforming process, which combines the semi-implicit backward Euler stress integration method and the explicit finite element solving algorithm. The three-dimensional Hi11＇48 yield criterion was implemented in the commercial finite element software LS-DYNA by using user defined material models UMAT. This algorithm was validated by the tensile test of single element. Besides, it was applied to the numerical simulation of hydraulic bulging to analyze the difference between Hi11＇48 anisotropic yield crite- rion and Mises isotropic yield criterion. The numerical results show that the implemented constitutive model is proper and it can reveal the deformation rule of tube bulging reasonably.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2013年第5期791-794,共4页
Journal of Shanghai Jiaotong University
基金
国家重大基础科研项目资助
关键词
内高压成形
各向异性
屈服准则
有限元法
hydroforming
anisotropy
yield criterion
finite element method
作者简介
卢健（1989-），男，浙江省温州市人，硕士生，主要从事液压成形过程数值仿真研究．E-mail：lujl018@126．com．
陈军（联系人），男，博士，教授，博士生导师，电话（Tel．）：02l628134308318；Email：jun-chert@sjtu．edu．cn．
