Abstract
The hypoelastic-based plasticity as well as the infinitesimal hyperelastic-based plasticity is adopted most widely to the elastoplastic deformation analyses of solids and structures at present. However, the additive decompositions of the strain rate and the continuum spin into elastic and plastic parts have been adopted a priori in the hypoelastic-based plasticity. The physical back ground for these additive decompositions will be elucidated in this article.
