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| T6态7075铝合金温热下各向异性研究 |
| The Anisotropic Property of 7075-T6 Aluminum Alloy under Warm Condition |
| Received:October 10, 2011 Revised:November 10, 2011 |
| DOI： |
| 中文关键词: 7075铝合金 温热成形 单向拉伸 厚向异性系数 屈服函数 |
| 英文关键词: 7075 Al alloy warm forming uniaxial tensile plastic anisotropy parameter yield function |
| 基金项目: |
| Author Name | Affiliation | | ZHOU Guo-wei | 1.State Key Laboratory of Mechanical System and Vibration, Shanghai 200240, China
2.School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China | | LI Da-yong | 1.State Key Laboratory of Mechanical System and Vibration, Shanghai 200240, China
2.School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China | | PENG Ying-hong | 1.State Key Laboratory of Mechanical System and Vibration, Shanghai 200240, China
2.School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| 中文摘要: |
| 对高强度铝合金7075-T6在0.03 s-1应变率下，50~250 ℃温度范围进行系列单向拉伸试验，并测得不同温度下的厚向异性系数R。结果表明：7075-T6铝合金的流动应力随试验温度的升高而减小；在50~200 ℃温度区间，延伸率随温度的升高而增加；当温度为250 ℃时，由于T6特性的消失，延伸率反有所降低，得到最佳的成形温度在200 ℃左右；并且通过对3种不同屈服函数Mises，Hill48和Barlat89比较，得到能准确方便描述7075-T6各向异性的屈服函数，确定了不同温度下屈服函数的参数。 |
| 英文摘要: |
| Uniaxial tensile tests of high strength aluminum alloy 7075-T6 are carried out at a range of temperatures(50~250 ℃) and strain rate 0.03 s-1. It is shown that the flow stress of 7075-T6 decreases as the temperature increases. The total elongation increases with the temperature increasing when it is between 50 ℃ and 200 ℃. The total elongation at 250 ℃ decreases because of the loss of T6 heat treatment and the optimum forming temperature for 7075-T6 is about 200 ℃. A suitable yield function is chosen through the comparison of three different functions: Mises, Hill48 and Barlat89, and the parameters of different temperatures are calculated. |
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