Research of Gray Model Applied in the Prior Corrosion and Fatigue of Aluminum Alloys

The effect of corrosion temperature and time on properties of the prior-corroded aluminum alloys was discussed tentatively, and gray model was introduced in the research of the simulating accelerated corrosion test for aluminum alloys. The non-linear relationship between mass loss,maximum corrosion depth,detail fatigue rating(DFR) and corrosion time was established based on power function,constant interval gray model as well as variable interval gray model. The results indicate that gray model can be employed to predict the underlying corrosion trend and fatigue properties precisely,compared with power model.Whether constant interval or variable interval data,gray model can describe successfully,and the accuracy of the gray model can also be improved by setting up modified residuals model.