The age forming technology, characterized by huge spring-backs, has been developed to manufacture large integral wing-skin panel parts, which necessitates devising a method of predicting spring-backs. A 7B04-T7451 aluminum alloy creep test in tension is accomplished at 155°C, and the creep curves are obtained. The material constants of the mechanism-based creep constitutive equations are determined through experiments. The age forming process and the spring-backs of 7B04 aluminum alloy plates are analyzed using the commercial finite element software ABAQUS. The effects of plate thickness and forming time on spring-backs are researched. The spring-backs decrease with the increase of plate thickness and forming time. The test results verify the reliability of the finite element method (FEM) analysis.
Lin, H., Min, W., Cailou, C., & Xiusheng, J. (2007). FEM analysis of spring-backs in age forming of aluminum alloy plates. Chinese Journal of Aeronautics, 20(6), 564–569. https://doi.org/10.1016/S1000-9361(07)60083-1