锻压技术

基于灰色系统理论的7075铝合金板材疲劳寿命研究

英文标题：Study on fatigue life of aluminum alloy 7075 sheet based on grey system theory

作者：马立勇颜景润张永清陈永强孙晓红

分类号：TG115.57

出版年,卷(期):页码：2017,42(7):173-176

摘要：

在航空用飞机蒙皮制造过程中，7075铝合金是十分理想的材料。为了更精确地研究并预测7075铝合金的疲劳寿命，对7075-T-651铝合金板材进行了疲劳试验，在应力比R=0.1条件下，测得120~320 MPa不同应力下7075-T-651铝合金板材的疲劳寿命。以试验数据为基础，将灰色系统理论运用到7075-T-651铝合金板材的疲劳寿命预测中，生成GM(1,1)模型，在与试验相同的条件下进行疲劳寿命预测，并将得到的疲劳寿命预测模型S-N曲线与试验数据S-N曲线进行对比。研究表明，所建立的灰色系统理论GM(1,1)模型S-N曲线与试验所得S-N曲线基本吻合，因此，可以通过GM(1,1)模型来预测7075铝合金板材的疲劳寿命。

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.

基金项目：

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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