Numerical and experimental study of AZ31-O magnesium alloy warm sheet forming

Abstract : In this project, the material is AZ31-O magnesium alloy sheet. The sheet thickness is 1.2mm. Warm tensile tests are performed to study ductility of AZ31-O magnesium alloy, the temperature and strain rate influence are included in all tests. The analysis result shows the ductility is enhanced with temperature increasing and strain rate decreasing, and the softening phenomenon is obvious at high temperature. The anisotropic property is not considered in this project. Warm Nakazima tests with hemisphere punch are performed to study formability of AZ31-O magnesium alloy. Finally, the FLD (Forming Limit Diagram) is identified and the comparisons distinctly show that the formability is better at higher temperature. Moreover, the forming limits predictions are performed in M-K model. The comparison clearly shows the theoretical prediction do not fit well with experiment. Finite element simulations are performed for a hemisphere punch deep drawing and a cross-shaped deep drawing. Firstly, the hemisphere punch deep drawing simulations are performed in FORGE® and ABAQUS®. The simulation result from FORGE and ABAQUS are compared in order to study the difference of various finite element simulation codes. Secondly, the damage behavior is studied in FORGE by Lemaitre damage model. Finally, the cross-shaped deep drawing simulation which is a benchmark of NUMISHEET 2011 conference is performed with FORGE. The punch load, thickness and temperature distribution are obtained and compared for each simulation. Furthermore, this benchmark simulation results (FORGE) are also compared with other various simulation software in conference. The detailed analysis results are presented in this thesis.
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Zhigang Liu. Numerical and experimental study of AZ31-O magnesium alloy warm sheet forming. Other. Ecole Nationale Supérieure des Mines de Paris, 2012. English. ⟨NNT : 2012ENMP0015⟩. ⟨pastel-00718370⟩

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