Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 25, Issue 1, Pages 1-25Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2008.01.005
Keywords
Forming limit diagrams; Polycrystalline plasticity; Marciniak-Kuczynski analysis
Funding
- CONICET [PIP 5181/05]
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In the sheet-metal forming industry, forming-limit strains have been a useful tool for quantifying metals formability. However, the experimental measurement of these strains is a difficult, time consuming and expensive process. It would be useful if strains calculated with a theoretical model could replace many of the experimental measurements. In this research, we analyze forming-limit strains of metals using a rate-dependent plasticity, polycrystal, self-consistent (VPSC) model in conjunction with the Marciniak-Kuczynski (M-K) approach. Previous researchers have studied forming limit diagrams (FLDs) based oil the full-constraints Taylor model. This is the first time, to the authors' knowledge, that the self-consistent approach has been introduced to simulate the polycrystal FLD behavior. Numerous microstructural factors characterizing the material have a strong influence oil the FLD, so our model includes the effects of slip hardening, strain-rate sensitivity, anisotropy and initial texture. Finally, the calculation of the FLD with a more realistic scale transition successfully predicts some of the experimental tendencies that the Taylor model cannot reproduce for aluminum alloys AA6116-T4 and AA5182-O. (C) 2008 Published by Elsevier Ltd.
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