Anisotropic Plastic Deformation and Damage in Commercial Al 2198 T8 Sheet Metal
Deformation anisotropy of sheet aluminium alloy 2198 (Al-Cu-Li) has been investigated by means of mechanical testing of notched specimens and Kahn-type fracture specimens, loaded in the rolling direction (L) or in the transverse direction (T). Contributions to failure are identified as growth of initial voids accompanied by a significant nucleation of a second population of cavities and transgranular failure. A model based on the Gurson-Tvergaard-Needleman (GTN) approach of porous metal plasticity incorporating isotropic voids, direction-dependent void growth, void nucleation at a second population of inclusions and triaxiality-dependent void coalescence has been used to predict the mechanical response of test samples. The model has been successfully used to describe and predict the direction-dependent deformation behaviour, crack propagation and, in particular, toughness anisotropy.
A. Saimoto and M.H. Aliabadi
D. Steglich et al., "Anisotropic Plastic Deformation and Damage in Commercial Al 2198 T8 Sheet Metal", Key Engineering Materials, Vols. 452-453, pp. 97-100, 2011