Effect of Anisotropic Plasticity on the Prediction of Formability of E-Form Magnesium Alloy Sheet
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In this paper, the formability of E-FORM magnesium alloy sheet (as one of recent alloys for automotive magnesium sheets) is analyzed based on the comparison between the results of actual magnesium (Mg) roof forming and those of finite element (FE) simulations. The FE model considers anisotropic mechanical properties and forming limit diagram (FLD) of the investigated magnesium alloy sheet. Through the coupled experimental and numerical procedure, the dominating factors for improving the accuracy of the numerical simulations are further studied. A commercial finite element analysis program, AUTOFORM®, is used for the simulations, in which identified mechanical properties and forming limit criteria are implemented as functions of temperature and strain rate. The improvement in the prediction of formability during the warm forming of the E-FORM magnesium alloy sheet can be obtained by considering a modified hardening law at large strain region, sheet anisotropy, and the properly measured forming limit curve.
Key WordsMg alloy Finite element analysis Warm forming Anisotropy Hardening Formability
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This work was supported by Research Resettlement Fund for the new faculty of Seoul National University (Grant No. 0668-20180066). MGL and YHL also appreciate the support from National Research Foundation of Korea (NRF2012R1A5A1051500).
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