| Prediction of forming limit curve （FLC） for AI-Li alloy 2198-T3 sheet using different yield functions |
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| 作者姓名： | Li Xiaoqiang Song Nan Guo Guiqiang Sun Zhonggang |
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| 作者单位： | [1]School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China [2]Aeronautical Manufacturing Technology Institute, Shanghai Aircraft Manufacturing Co. Ltd., Shanghai 200436, China |
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| 基金项目： | Acknowledgements The authors are grateful to Miss Wang Sida for suggestions of rhetoric expression. This study was co-supported by National Natural Science Foundation of China （No. 50905008） and Fund of National Engineering and Research Center for Commercial Aircraft Manufacturing （No. SAMC 12-JS- 15-008）. |
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| 摘 要： | The Forming Limit Curve （FLC） of the third generation aluminum-lithium （Al-Li） alloy 2198-T3 is measured by conducting a hemispherical dome test with specimens of different widths. The theoretical prediction of the FLC of 2198-T3 is based on the M-K theory utilizing respectively the von Mises, Hill＇48, Hosford and Barlat 89 yield functions, and the different predicted curves due to different yield functions are compared with the experimentally measured FLC of 2198-T3. The results show that though there are differences among the four predicted curves, yet they all agree well with the experimentally measured curve. In the area near the planar strain state, the predicted curves and experimentally measured curve are very close. The predicted curve based on the Hosford yield function is more accurate under the tension-compression strain states described in the left part of the FLC, while the accuracy is better for the predicted curve based on Hill＇48 yield function under the tension-tension strain states shown in the right part.
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| 关 键 词： | 成形极限曲线 屈服函数 理论预测 FLC 合金 平面应变状态 预测曲线 薄板 |
| 收稿时间： | 2 August 2012 |
Prediction of forming limit curve （FLC） for AI-Li alloy 2198-T3 sheet using different yield functions |
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| Li Xiaoqiang,Song Nan,Guo Guiqiang,Sun Zhonggang.Prediction of forming limit curve （FLC） for AI-Li alloy 2198-T3 sheet using different yield functions[J].Chinese Journal of Aeronautics,2013,26(5):1317-1323. |
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| Authors: | Xiaoqiang Li Nan Song Guiqiang Guo Zhonggang Sun |
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| Institution: | 1. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;2. Aeronautical Manufacturing Technology Institute, Shanghai Aircraft Manufacturing Co. Ltd., Shanghai 200436, China |
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| Abstract: | The Forming Limit Curve (FLC) of the third generation aluminum–lithium (Al–Li) alloy 2198-T3 is measured by conducting a hemispherical dome test with specimens of different widths. The theoretical prediction of the FLC of 2198-T3 is based on the M–K theory utilizing respectively the von Mises, Hill’48, Hosford and Barlat 89 yield functions, and the different predicted curves due to different yield functions are compared with the experimentally measured FLC of 2198-T3. The results show that though there are differences among the four predicted curves, yet they all agree well with the experimentally measured curve. In the area near the planar strain state, the predicted curves and experimentally measured curve are very close. The predicted curve based on the Hosford yield function is more accurate under the tension–compression strain states described in the left part of the FLC, while the accuracy is better for the predicted curve based on Hill’48 yield function under the tension–tension strain states shown in the right part. |
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| Keywords: | Aluminum-lithium alloy Fracture Forming limit curve M-K theory Theoretical prediction |
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