Transactions of Materials and Heat Treatment

Title：Study on fatigue life of aluminum alloy 7075 sheet based on grey system theory

Authors： Ma Liyong Yan Jingrun Zhang Yongqing Chen Yongqiang Sun Xiaohong

Unit： Hebei University of Architecture Central South University CRRC Qingdao Sifang Co. Ltd.

KeyWords： 7075 aluminum alloy fatigue life grey system theory GM(1 1) model S-N curve

ClassificationCode：TG115.57

year,vol(issue):pagenumber：2017,42(7):173-176

Abstract：

In the manufacturing of aeroplane skin for aviation, aluminum alloy 7075 is a kind of ideal material. In order to predict the fatigue life of aluminum alloy 7075 precisely, several fatigue experiments were conducted. Under the condition of stress ratio R=0.1, the fatigue lives of aluminum alloy 7075-T-651 sheet were measured with different stresses of 120-320 MPa. Then, based on the experiment results, the grey system theory was used in the fatigue life prediction of aluminum alloy 7075-T-651 sheet, and the GM(1,1) model was generated. At the same time, the fatigue life prediction was conducted at the same conditions as the experiment, and the S-N curves of the prediction model and the experimental data were compared. This research shows that the S-N curve of the prediction model is the same as that of experiment. Thus, the GM(1,1) model can predict the fatigue life of aluminum alloy 7075.

Funds：

国家自然科学基金资助项目（51375500）；河北省高等学校科学技术研究项目(ZC2016030，ZD2016160)；河北建筑工程学院青年基金项目（QN201402，QN201401）

作者简介：马立勇（1987-），男，硕士，讲师，E-mail：maliyongmail@foxmail.com；通讯作者：颜景润（1981-），女，硕士，讲师，E-mail：26760228@qq.com

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