Constitutive equation for finite deformation deviatoric plasticity and creep are considered based upon the internal time (endochronic) concept, and the concept of a material director. For deformations of the type that involve only small elastic strains, the present constitutive equations lead to a flow rule, and an evolution equation for the back stress tensor. In the case of finite deformation rate-independent plasticity, field-bounary element method for determining velocity strains; and a midpoint radial return, objective integration, algorithm for determining the stresses, are presented.
|Number of pages||16|
|Journal||American Society of Mechanical Engineers, Applied Mechanics Division, AMD|
|State||Published - 1987|