Optimization of spring back in creep age forming process of 7075 Al Alclad alloy using D optimal design of experiment method
Abstract This paper attempts to model and predict the spring back for creep age forming of a 7075 Al Alclad alloy using statistical analyses based on a design of experiments method. Time and temperature were chosen as effective variables for determining spring back in the creep age forming process. The D optimal design of experiments method facilitated statistical analyses and the extraction of a mathematical model for determining spring back in the experimental variables domain. The spring back of the specimens was calculated using a numerical procedure based on the pure bending theory. Analysis of the variances for spring back showed that temperature was the most effective variable in the creep age forming process. Additionally, a mathematical model and the response surface of the spring back showed that to decrease spring back, the significant variables should be in the upper level. The spring back in the creep age forming process was optimized for a 7075 Al Alclad alloy in the optimum mechanical properties region.