Abstract
Large elastic-plastic deformation in, for example, metal forming processes has been analyzed, so far, primarily on the basis of J2-deformation theory, especially in situation where strain localization, such as shear-band formation in a block or localized necking in a sheet, takes place. In order to improve the J2-deformation theory, three constitutive equaitons, one of which was previously proposed by the author, are introduced. By several FEM analyses of fundamental large elastic-plastic deformations, such as uniaxial tension and simple shear, it is demonstrated that these three constitutive equaitons are equivalently effective in predicting the strain localization phenomenon even in a quantitative sense.
