ABSTRACT
Draw-bend tests performed some years ago on four aluminum alloys (2008-T4, 5182-O, 6022-T4, and 6111-T4) revealed that specimens can continue to change shape for long periods, up to 15 months, following forming and unloading [1]. Contemporaneous tests of autobody steels (DQSK, AKDQ and HSLA steels) tested under identical conditions showed no such time-dependent springback over a 7 year period [2]. Current, preliminary results for a few advanced high strength steels (DP600, DP800, DP980 and TRIP780) revealed time-dependent springback at room temperature; the sign of the springback reversing for certain combinations of process conditions. Time-dependent behavior of four advanced high strength steel was measured and creep-simulated for various test conditions. Comparisons show qualitative agreement, but the simulations over-predict the magnitude of the effect
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Lim, H., Lee, M.G., Sung, J.H. et al. Time-dependent Springback. Int J Mater Form 1 (Suppl 1), 157–160 (2008). https://doi.org/10.1007/s12289-008-0015-2
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DOI: https://doi.org/10.1007/s12289-008-0015-2