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

Endochronic constitutive equations have been derived for use in the de scription 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 applie d to describe the deformation of metal tubes subjected to torsion. Sev eral different loading conditions have been considered. The theoretica l results have been compared with the experimental data for three diff erent metals. Reasonable agreement between theory and experiment has b een achieved.