Numerical modeling of formability of extruded magnesium alloy tubes |
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| Authors: | J Lévesque K Inal KW Neale RK Mishra |
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| Institution: | 1. Department of Mechanical Engineering, Laval University, Cité Universitaire, Québec, Que., Canada G1K 7P4;2. Department of Mechanical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ont., Canada N2L 3G1;3. Department of Civil Engineering, University of Sherbrooke, 2500, boul. de l’Université, Sherbrooke, Que., Canada J1K 2R1;4. General Motors Research and Development Center, 30500 Mound Road, Warren, MI 48090-9055, USA |
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| Abstract: | In this paper, a constitutive framework based on a rate-dependent crystal plasticity theory is employed to simulate the large strain deformation phenomena in hexagonal closed-packed (HCP) metals such as magnesium. The new framework is incorporated into in-house codes. Simulations are performed using the new crystal plasticity model in which crystallographic slip and deformation twinning are the principal deformation mechanisms. Simulations of various stress states (uniaxial tension, uniaxial compression and the so-called ring hoop tension test) for the magnesium alloy AM30 are performed and the results are compared with experimental observations of specimens deformed at 200 °C. Numerical simulations of forming limit diagrams (FLDs) are also performed using the Marciniak–Kuczynski (M–K) approach. With this formulation, the effects of crystallographic slip and deformation twinning on the FLD can be assessed. |
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| Keywords: | Crystal plasticity Forming limit diagrams Marciniak&ndash Kuczynski (M&ndash K) analysis Magnesium alloys HCP metals |
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