Influence of elastic modulus change by springback prediction of high strength steel
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Abstract
The springback is caused by the release of residual stresses in a work piece after forming process. Especially, the springback effect is severe by forming high strength steel sheet. A success of the springback prediction using Finite Element (FE) forming simulation strongly depends on the applied materials model. Among various parameters of the model, elastic modulus is one of the most important factors influencing the calculation accuracy that should be considered as a function of strain. In this work, two different material models, the Hill48 and Yoshida-Uemori model were used. For both models, constant and varied elastic moduli were defined. Experimentally and numerically resulted springback of a hat shape stamped part were compared. Considering the elastic modulus change improved the accuracy of the springback prediction. The Yoshida-Uemori model showed better predictions than the Hill48 model in all cases.
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References
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