Prediction of the Ductility Limit of Magnesium AZ31B Alloy

Mohamed Yassine Jedidi (1, 2) , Mohamed Ben Bettaieb (1, 3) , Anas Bouguecha (2) , Farid Abed-Meraim (1, 3) , Mohamed Taoufik Khabou (2) , Mohamed Haddar (2)

1 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux
2 LA2MP - Laboratoire de recherche de Mécanique, Modélisation et Production
3 Labex DAMAS

In many engineering applications (automotive, computer and mobile device industries, etc.), magnesium alloys have been widely used owing to their interesting physical and mechanical parameters. However, magnesium alloys are identified by the low ductility at room temperature, due to their strong plastic anisotropy and the yielding asymmetry between tension and compression. In this work, the ductility limit of a rolled magnesium AZ31 sheet metal at room temperature is numerically investigated. This investigation is based on the coupling between a reduced-order crystal plasticity model and the Marciniak–Kuczyński localized necking approach. This reduced-order model is used to describe the anisotropic behavior of this material taking into account the strong plastic anisotropy (e.g., yielding asymmetry between tension and compression) due to the limited number of slip systems (i.e., twinning mode). To accurately describe the plastic anisotropy due to slip and twinning modes, a combination of two separate yield functions (according to Barlat and Cazacu) is used. The coupling between the adopted constitutive framework and the Marciniak–Kuczyński instability approach is numerically implemented via an implicit algorithm. Comparisons between experimental results from the literature and numerical results obtained by using our calculation tool are carried out to validate the choice of the reducedorder crystal plasticity model.

Mots clés: Ductility limit; Reduced-order crystal plasticity model; Marciniak–Kuczyński instability approach; Plastic anisotropy; Yielding asymmetry

Domaines: Sciences de l'ingénieur [physics]; Mécanique [physics]; Mécanique des solides [physics.class-ph]; Mécanique des matériaux [physics.class-ph]; Matériaux; Génie mécanique [physics.class-ph]

Mohamed Yassine Jedidi, Mohamed Ben Bettaieb, Anas Bouguecha, Farid Abed-Meraim, Mohamed Taoufik Khabou, et al.. Prediction of the Ductility Limit of Magnesium AZ31B Alloy. Advances in Materials, Mechanics and Manufacturing, Springer International Publishing, pp.182-193, 2019, 978-3-030-24246-6. ⟨10.1007/978-3-030-24247-3_21⟩. ⟨hal-02873000⟩