应力-应变曲线形式对铝合金板料成形极限的影响

doi:10.12068/j.issn.1005-3026.2020.03.025

东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (3): 445-451.DOI: 10.12068/j.issn.1005-3026.2020.03.025

应力-应变曲线形式对铝合金板料成形极限的影响

蔡中义^1,2，李丽¹，孙丽荣¹，孟凡响¹

(1.吉林大学材料科学与工程学院，吉林长春130025; 2.吉林大学辊锻工艺研究所，吉林长春130025)

收稿日期:2019-05-27 修回日期:2019-05-27 出版日期:2020-03-15 发布日期:2020-04-10
通讯作者: 蔡中义
作者简介:蔡中义(1963-)，男，吉林松原人，吉林大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(51575231).

Effect of Data Mode from Stress-Strain Curve on Forming Limit of Aluminum Alloy Sheets

CAI Zhong-yi^1,2， LI Li¹， SUN Li-rong¹， MENG Fan-xiang¹

1.College of Materials Science and Engineering， Jilin University， Changchun 130025， China； 2. Roll Forging Research Institute， Jilin University， Changchun 130025， China.

Received:2019-05-27 Revised:2019-05-27 Online:2020-03-15 Published:2020-04-10
Contact: CAI Zhong-yi
About author:-
Supported by:
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摘要/Abstract

摘要： 为使板料的成形性分析更符合实际，以Marciniak-Kuczynski(M-K)理论为基础，提出了采用应力-应变测量数据预测铝合金板料成形极限的方法.分别采用应力-应变测量数据、幂指数以及多项式拟合曲线三种应力-应变形式对6016-T4和7075-T6铝合金板料的成形极限进行研究.通过单向拉伸实验得到材料的应力-应变数据，构建了不同形式的曲线模型，计算了相应的极限应变，并绘制了板料成形极限曲线.将理论上预测的FLC与胀形实验结果进行对比，结果表明，采用应力-应变测量数据对板料成形极限的预测最好，而常用的幂指数拟合曲线得到的预测结果与实验存在一定的偏差.

关键词: 应力-应变曲线, M-K理论, 成形极限图, 理论预测, 板料

Abstract: In order to analyze sheet formability more realistically， a new approach based on the M-K theory was proposed， which predicted the forming limit of aluminum alloy sheets by using different modes of data from the measured stress-strain curve. The forming limits of 6016-T4 and 7075-T6 aluminum alloy sheets were theoretically analyzed using three modes of data， which were the original data of the measured stress-strain curve， the power exponential fitted data and polynomial fitted data of the stress-strain curves， respectively. According to the stress-strain data from tensile test， the ultimate strains were calculated and the theoretical forming limit curves (FLC) were plotted. After comparing the theoretically predicted FLC with experimental data from the bulging test， the results indicate that the predicted forming limits using the data of the original stress-strain curve is the best one， while the forming limits using the data from the power exponential fitted curve has a certain deviation from the experimental one.

Key words: stress-strain curve, M-K theory, forming limit diagram(FLD), theoretical prediction, metal sheet

中图分类号:

TG386

蔡中义，李丽，孙丽荣，孟凡响. 应力-应变曲线形式对铝合金板料成形极限的影响[J]. 东北大学学报:自然科学版, 2020, 41(3): 445-451.

CAI Zhong-yi， LI Li， SUN Li-rong， MENG Fan-xiang. Effect of Data Mode from Stress-Strain Curve on Forming Limit of Aluminum Alloy Sheets[J]. Journal of Northeastern University Natural Science, 2020, 41(3): 445-451.

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应力-应变曲线形式对铝合金板料成形极限的影响

Effect of Data Mode from Stress-Strain Curve on Forming Limit of Aluminum Alloy Sheets

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