Evolution of the 3D plastic anisotropy of HCP metals: Experiments and modeling

B. Kondori (1) , Yazid Madi (2) , Jacques Besson (2) , A.A. Benzerga (1)

1 TAMU - Department of Aerospace Engineering [College Station]
2 CDM - Centre des Matériaux

A two-surface, pressure-insensitive plasticity model is further developed to represent the mechanical response of hexagonal close packed metals. The model describes the 3D plastic anisotropy of a material, the tension–compression asymmetry, and the consistent evolution upon straining of both the net anisotropy and the asymmetry. The model may be viewed as a reduced order quasi-crystal plasticity model whereby the two activation surfaces represent glide- and twinning-dominated flow. The two-surface formulation enables to represent independent, yet coupled, hardening laws in terms of effective plastic strains accumulated on either generic deformation system. Application of the model to a discriminating data set assembled for a magnesium alloy thick plate illustrates the capabilities and versatility of the modeling approach.

Mots clés: Orthotropy Strength differential effect Differential hardening Twinning Reduced order model

Domaines: Matériaux; Mécanique des structures [physics.class-ph]; Mécanique des matériaux [physics.class-ph]

B. Kondori, Yazid Madi, Jacques Besson, A.A. Benzerga. Evolution of the 3D plastic anisotropy of HCP metals: Experiments and modeling. International Journal of Plasticity, 2019, 117, pp.71-92. ⟨10.1016/j.ijplas.2017.12.002⟩. ⟨hal-02437541⟩