ELASTOPLASTIC MATERIAL BEHAVIOR WITH LARGE ELASTIC AND LARGE PLASTIC-DEFORMATIONS

Many materials, e.g. steel, exhibit large plastic deformations but onl y small elastic deformations. This is not the case, however, for certa in A inds of polymers and rubbers, which suffer plastic flow after lar ge elastic deformation. rn most preview investigations of such materia ls, particularly for rubber, the plastic material behaviour was neglec ted, although the kinds of rubber exhibiting little or no plastic defo rmation are not those wed in practical applications, Especially rubber s with a high tensile strength and resistance to aging show noticeable hysteresis effects under quasistatic loading. In this work an algorit hm is formulated which accounts for isotropic elastoplastic problems w ith large elastic and large plastic deformations. In order to guarante e realistic calculations, the material model was fit to a set of exper iments. The necessity to incorporate large elastic strains is document ed by a numerical example.