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

doi:10.13700/j.bh.1001-5965.2014.0310

基于修正M-K模型的铝合金板材成形极限图预测

doi: 10.13700/j.bh.1001-5965.2014.0310

北京航空航天大学机械工程及自动化学院, 北京 100191

基金项目: 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)

详细信息

作者简介:
杨希英(1985—),男,河北衡水人,博士生,yxiyingbuaa@163.com

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.

中图分类号: V260.1;TG394
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出版历程
- 收稿日期: 2014-05-29
- 修回日期: 2014-07-25
- 网络出版日期: 2015-04-20

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

School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

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.
- 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.
- aluminum alloy sheet /
- M-K model /
- ductile fracture criterion /
- initial thickness imperfection /
- forming limit diagram

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参考文献(17)

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