Predictions of forming limit diagrams using a rate-dependent polycrystal self-consistent plasticity model |
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Authors: | JW Signorelli MA BertinettiPA Turner |
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Institution: | IFIR (CONICET-UNR), 27 de febrero 210 bis, 2000 Rosario, Santa Fe, Argentina; FCEIA (UNR) Pellegrini 250, 2000 Rosario, Argentina |
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Abstract: | 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 on 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 on 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. |
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Keywords: | Forming limit diagrams Polycrystalline plasticity Marciniak&ndash Kuczynski analysis |
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