Nential Factor in the Phenomenological Form of the Shear Strain Rate Equation (eqn. 1.5) Found by Hart, Li and Their Co-workers

Fig. AI.l The stress dependence of the activation area for a dislocation segment overcoming a simple discrete obstacle. ABSTRACT. This chapte~ p~esents the foundations in continuum mechanics and i~~eve~sible the~odynamics fo~ constitutive ~e­ lations gove~ing plasticity. Special emphasis is given to the connection of mac~oscopic fo~lations to defo~ation mechanisms as ope~ative on the mic~scale. Indeed, much of the chapte~ is organized around an inte~al variable f~amewo~k by which inelastic st~ctural ~ea~rangements of a ~ep~esentative mate~al sample can be ~elated to its mac~oscopic defo~mation. This is illust~ated most extensively fo~ defo~tion by slip, but othe~ mechanisms such as diffusion and phase changes a~e discussed as well. An extended synopsis is given in the summa~ section.