北京航空航天大学学报 ›› 2015, Vol. 41 ›› Issue (4): 675-679.doi: 10.13700/j.bh.1001-5965.2014.0310

• 论文 • 上一篇    下一篇

基于修正M-K模型的铝合金板材成形极限图预测

杨希英, 郎利辉, 刘康宁, 蔡高参, 郭禅   

  1. 北京航空航天大学 机械工程及自动化学院, 北京 100191
  • 收稿日期:2014-05-29 修回日期:2014-07-25 出版日期:2015-04-20 发布日期:2015-05-08
  • 通讯作者: 郎利辉(1970—),男,河南新乡人,教授,lang@buaa.edu.cn,主要研究方向为先进成形技术及装备. E-mail:lang@buaa.edu.cn
  • 作者简介:杨希英(1985—),男,河北衡水人,博士生,yxiyingbuaa@163.com
  • 基金资助:

    国家自然科学基金资助项目(50975014); 中俄国际合作与交流NSFC-RFBR基金资助项目(51010166)

Prediction of forming limit diagram of AA7075-O aluminum alloy sheet based on modified M-K model

YANG Xiying, LANG Lihui, LIU Kangning, CAI Gaocan, GUO Chan   

  1. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2014-05-29 Revised:2014-07-25 Online:2015-04-20 Published:2015-05-08

摘要:

为准确预测AA7075-O铝合金板材的成形极限,将韧性断裂准则和传统M-K模型相结合,提出一种基于韧性断裂准则的修正M-K模型.利用单向拉伸模拟和试验相结合的方法,提取危险单元的应力应变历史并代入C-L韧性断裂准则中,得到材料常数.基于单向拉伸试验所得成形极限点,通过MATLAB编程得到修正M-K模型的初始厚度不均度.在常温下,以单向拉伸、宽板弯曲、液压胀形试验获得AA7075-O铝合金板材的成形极限曲线,与修正M-K模型和传统M-K模型计算得到的理论成形极限曲线进行对比,验证了修正M-K模型的可行性和准确性.

关键词: 铝合金板, M-K模型, 韧性断裂准则, 初始厚度不均度, 成形极限图

Abstract:

To accurately predict the forming limit diagram of AA7075-O aluminum alloy sheet, a modified M-K model was put forward based on the ductile fracture criterion and the traditional M-K model. By using the method which combined the uniaxial tension simulation with experiment, the history of stress-strain of the dangerous element was substituted into the C-L ductile fracture criterion which was implemented into Abaqus/Explicit to get the material constant. Based on the forming limit data obtained by the uniaxial tensile, the initial thickness imperfection in the modified M-K model was obtained by the method which was programed in MATLAB. At room temperature, the experimental forming limit data of AA7075-O aluminum alloy sheet were tested through the uniaxial tensile, wide plate bending and hydraulic bulging experiments. Meanwhile, the theoretical forming limit curves obtained by the modified M-K model and the traditional M-K model were computed respectively. By comparison, the modified M-K model is proved to be feasible and more accurate.

Key words: aluminum alloy sheet, M-K model, ductile fracture criterion, initial thickness imperfection, forming limit diagram

中图分类号: 


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