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Evolution of the 3D plastic anisotropy of HCP metals: Experiments and modeling
Ist Teil von
International journal of plasticity, 2019-06, Vol.117, p.71-92
Ort / Verlag
New York: Elsevier Ltd
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
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.
•Two-surface constitutive model developed to describe elasto-plastic behavior of HCP materials.•Symmetric glide-dominated surface and asymmetric twinning-affected surface used.•Plastic flow anisotropy characterized in full 3D for Mg alloy AZ31.•Model assessed against experiments for principal and off-axes orientations.•Model shown to be effective in describing evolving plastic anisotropy and yield asymmetry.