Anisotropic Plastic Deformation and Damage in Commercial Al 2198 T8 Sheet Metal

Dirk Steglich; Husam Wafai; Jacques Besson

doi:10.4028/www.scientific.net/KEM.452-453.97

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 452-453Anisotropic Plastic Deformation and Damage in...

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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Key Engineering Materials (Volumes 452-453)

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97-100

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https://doi.org/10.4028/www.scientific.net/KEM.452-453.97

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Online since:

November 2010

Authors:

Dirk Steglich, Husam Wafai, Jacques Besson

Keywords:

Anisotropy, Ductile Damage, Kahn Specimen, Plasticity, Unit Cell, Void Growth

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