ANISOTROPIC POTENTIALS FOR PLASTICALLY DEFORMING METALS

Recently, some potentials were proposed to analytically describe the p lastic behavior of orthotropic metals. These potentials were expressed either in six-dimensional stress space (yield function) or in six-dim ensional strain rate space (strain rate potential). It was shown that these phenomenological potentials provide a good approximation of the plastic potentials calculated with polycrystal models. They can be use d for any type of loading condition applied to materials with orthotro pic anisotropy. In this paper, both potentials will be presented under the same theoretical framework. The determination of the constants th at characterize the anisotropy will be explained. To conclude. the app lication of these potentials in finite-element method (FEM) codes will be discussed.