有效的板料成形反向模拟法应力修正策略

计算物理 ›› 2008, Vol. 25 ›› Issue (5): 585-590.

有效的板料成形反向模拟法应力修正策略

唐炳涛¹, 王兆清¹, 鹿晓阳¹, 张郁²

1. 山东建筑大学工程力学研究所, 山东济南 250101;
2. 上海赛科利汽车模具技术应用有限公司质量保证部, 上海 201209

收稿日期:2007-05-28 修回日期:2007-11-15 出版日期:2008-09-25 发布日期:2008-09-25
作者简介:唐炳涛(1976-),男,山东莱州,博士,讲师,从事金属塑性成形方面研究.
基金资助:
国家自然科学基金(10472058);山东建筑大学博士科研启动基金资助项目

Efficient Strategy for Stress Distritution in Inverse Analysis of Sheet Metal Stamping

TANG Bingtao¹, WANG Zhaoqing¹, LU Xiaoyang¹, ZHANG Yu²

1. Institute of Engineering Mechanics, Shandong Jianzhu University, Jinan 250101, China;
2. Quality Assurance Department, Shanghai Sekely Automobile Modeling Technology Co., Ltd., Shanghai 201209, China

Received:2007-05-28 Revised:2007-11-15 Online:2008-09-25 Published:2008-09-25

摘要/Abstract

摘要： 金属在流经凹模圆角时受到强烈的弯曲作用,传统的板料成形反向模拟法没有考虑变形历史对应力预测的影响,使得反向模拟法计算的应力值与实际情况有较大偏差.针对反向模拟法无法准确预测成形零件应力分布的缺点,提出一种快速搜索流经凹模圆角区域的单元的方法,对该部分单元进行应力修正.采用一种高效的单轴连续拉伸应力应变本构关系模型,避免了增量有限元法应力应变更新算法的复杂性,同时充分考虑了凹模圆角对金属变形历史的影响.NUMISHEET'93盒形件拉深的标准考题中,通过与增量有限元模拟软件DYNAFORM计算结果的比较,验证了采用提出的多步连续拉伸本构关系模型可以有效地反映变形历史的影响,获得更加接近实际的应力分布.

关键词: 板料成形, 反向模拟法, 本构关系

Abstract: To overcome shortcomings of traditional inverse analysis method (TIAM), a fast and reliable searching scheme is used to find elements passing through die entrance radius during deformation process. An efficient stress-strain relation for continuous uniaxial tensile test is introduced to update stress distributions. Constitutive equations avoid complexity of incremental FEM based stress/strain updating algorithms, and effects of die entrance radius on deformation history are considered. Numisheet'93 square box drawing benchmark demonstrates that the constitutive equations significantly enhance prediction of stress distribution compared with incremental FEM based software DYNAFORM.

Key words: sheet metal stamping, inverse analysis method, constitutive equations

中图分类号:

O344.3

唐炳涛, 王兆清, 鹿晓阳, 张郁. 有效的板料成形反向模拟法应力修正策略[J]. 计算物理, 2008, 25(5): 585-590.

TANG Bingtao, WANG Zhaoqing, LU Xiaoyang, ZHANG Yu. Efficient Strategy for Stress Distritution in Inverse Analysis of Sheet Metal Stamping[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2008, 25(5): 585-590.