Predicting forming limit diagrams for magnesium alloys using crystal plasticity finite elements

Journal Article · Wed Nov 27 00:00:00 EST 2019 · International Journal of Plasticity

DOI:https://doi.org/10.1016/j.ijplas.2019.11.009· OSTI ID:1606977

Bong, Hyuk Jong ^[1]; Lee, Jinwoo ^[1]; Hu, Xiaohua ^[2]; Sun, Xin ^[2]; Lee, Myoung-Gyu ^[3]

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1. Korea Inst. of Materials Science (South Korea)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
3. Seoul National Univ. (South Korea)

The crystal plasticity finite element (CPFE) method was used to predict forming limit strains of hexagonal close-packed (HCP) polycrystalline magnesium alloy sheets, namely AZ31 and ZE10, under an isothermal temperature condition. The strain rate-dependent uniaxial tensile test data along various loading directions and an initial texture were used to determine the constitutive parameters of the crystal plasticity model. A hybrid representative volume element approach, which combines the CPFE and the Marciniak–Kuczynski model, was developed to obtain the forming limit diagram of the magnesium alloys. The predicted forming limits were in excellent agreement with the Nakazima test results. Moreover, the microscopic responses such as slip/twin activation and deformation texture changes during various loading paths from uniaxial tension to the balanced biaxial tension were comprehensively analyzed and discussed from the CPFE results to understand the underlying micro-mechanism for the macro-mechanical responses.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1606977
• Alternate ID(s): OSTI ID: 1702777
• Journal Information: International Journal of Plasticity, Journal Name: International Journal of Plasticity Journal Issue: C Vol. 126; ISSN 0749-6419
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Crystal plasticity
Finite element simulation
Forming limit diagram
Magnesium alloys
Nakazima test