Xu Feng*, Lin Zhongqin, Li Shuhui
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
FREE ABSTRACT (to read the full article, please log in below).
Springback has negative influences
on the dimensional accuracy of stamped parts. In the past decades, researchers
have proposed several ways to predict springback, among which the coupled
explicit–implicit finite element method is currently in wide use. However,
at present this method usually consumes much CPU time and may not be suitable
at the preliminary product feasibility stage. This paper describes a one-step–implicit
method to efficiently predict springback for the purpose of practical use.
One-step approach, which is based on the deformation theory of plasticity,
has been implemented in a code to calculate the strain and stress distribution
in the sheet after forming process. Then a commercial implicit solver is
used to handle springback calculation. Validation against a square cup
and application to an auto-body component are presented with emphasis on
the efficiency of the proposed method. Also, limitations of the method
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