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The M–K method has been used with Barlat׳s 1989 anisotropic yield surface to predicate forming limit to study the effect of the normal stress and material anisotropy. The 3D stress state is converted to plane-stress state according to the hypothesis that hydrostatic stress has no effect on plastic deformation. The predicted forming limits correlate well with experimental data for AA5XXX under plane-stress...
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