Analysis of plastic flow localization under strain paths changes and its coupling with finite element simulation in sheet metal forming |
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Authors: | A Barata da Rocha Abel D Santos Pedro Teixeira MC Butuc |
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Affiliation: | 1. FEUP–Faculty of Engineering, University of Porto, R. Dr. Roberto Frias s/n, 4200-465 Porto, Portugal;2. INEGI–Institute of Mechanical Engineering and Industrial Management, R. Dr. Roberto Frias 400, 4200-465 Porto, Portugal;3. Department of Mechanical Engineering, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal |
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Abstract: | Formability of sheet metal is usually assessed by the useful concept of forming limit diagrams (FLD) and forming limit curves (FLC) represent a first safety criterion for deep drawing operations. The level of FLC is strongly strain path dependent as observed by experimental and numerical results and therefore non-proportional strain paths need to be incorporated when analyzing formability of sheet metal components. Simulations using finite element method allow accurate predictions of stress and strain distributions in complex stamped parts. However, the prediction of localized necking is a difficult task and the combination of forming limit diagram analysis with finite element simulations often fail to give the right answer, if complex strain paths are not included in these predictions. |
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Keywords: | Failure prediction Forming limit diagrams Sheet metal forming Numerical simulation |
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