A polycrystalline damage model applied to an anisotropic aluminum alloy 2198 under non-proportional load path changes

A ductile damage model, which fully couples classical void growth at high stress triaxiality and Coulomb model the slip system scale low triaxiality, was applied for sheet specimens in an anisotropic aluminum alloy under non-proportional load path changes. The combines resolved normal shear stresses each plane directions. Reduced Texture Methodology (RTM) used to provide computational efficiency this approach involved a significant reduction number of representative crystallographic orientations. 12-grain using 12 orientations validated change experiments. calibrated plasticity single element calculations proportional tension, ‘shear tension’ (ST) loadings. Next, parameters were against loading tension experimental results 3D mesh full-size calculations. successfully predicted failure. Locally, indicator maxima coincided with location where features observed via imaging (computed tomography).