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Anisotropic plastic deformation and damage in commercial Al 2198 T8 sheet metal

Abstract : 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.
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Submitted on : Thursday, June 23, 2011 - 2:59:16 PM
Last modification on : Wednesday, November 17, 2021 - 12:27:23 PM

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D. Steglich, H. Wafai, Jacques Besson. Anisotropic plastic deformation and damage in commercial Al 2198 T8 sheet metal. Advances in fracture and damage mechanics IX, Sep 2010, Nagasaki, Japan. pp.97-100, ⟨10.4028/⟩. ⟨hal-00602840⟩



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