ENDOCHRONIC EQUATIONS FOR FINITE PLASTIC-DEFORMATION AND APPLICATION TO METAL TUBE UNDER TORSION

Endochronic constitutive equations have been derived for use in the description of rigid-plastic deformation in the finite strain range. The concepts of corotational rate, corotational integral and plastic spin have been incorporated into the theory. The equations are then applied to describe the deformation of metal tubes subjected to torsion. Several different loading conditions have been considered. The theoretical results have been compared with the experimental data for three different metals. Reasonable agreement between theory and experiment has been achieved.