Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
510314 | Computers & Structures | 2011 | 11 Pages |
Abstract
Numerical prediction of springback remains one of the major problems in sheet metal forming. The quality of springback prediction for a sheet metal forming process depends on a precise estimation of the stress distribution all over the metal sheet. In particular, the decrease of the unloading elastic modulus (non-linear recovery) with increasing plastic prestrain during stress reversals, observed by several authors, was commonly not taken into account in FE analysis. A model is proposed which takes the elastic modulus evolution with plastic prestrain and the unloading stress into account. Numerical simulations show that this model coupled with a non-linear kinematic hardening model can accurately predict the springback amount.
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Physical Sciences and Engineering
Computer Science
Computer Science Applications
Authors
Sami Chatti, Noureddine Hermi,