Springback in creep age forming of 7475 aluminum alloy

A series of creep tests for 7475-T7351 alloy sheet are carried out to build Kowalewski creep constitutive model. The influences of the plate thickness, the forming time and the forming radius on the springback are analyzed by the finite element analysis. The results show that the larger plate thickness and the longer forming time cause smaller amount of springback, while the equivalent creep strain and total creep deformation amount are inversely proportional to the radius on the mold surface. The experimental results show that the creep constitutive model and the finite element model can predict the creep aging process of actual parts accurately.