DESCRIPTION OF THE EXPONENT IN THE BODNER-PARTOM MODEL-BASED ON DEFORMATION KINETICS THEORY

The Bodner-Partom model defines the constitutive law of plastic deform ation for a large range of materials with a system that is economical for computer processing. Because the model was designed to combine phy sically defined concepts with empirical descriptions it is of interest to extend its validity by expressing the empirical exponent, which re presents temperature dependence, in terms of macroscopic and material characteristic quantities derived rigorously from basic physical princ iples in the context of deformation kinetics theory. The expression de rived provides guidance for the development of improved material prope rties, testing methods, manufacturing process and product design, and maintenance procedures.