Large deformations of a thin ring plate. I

The analysis of formation change of thin ring plates is carried out in case of large plastic deformations, in view of interconnected change of thickness of the material and deformation of hardening. It is established, that in case of isotropic hardening the equations of the plastic plane stress are reflected on a deviator plane of the cylinder of plasticity as simple dependence between speeds of radial stress and intensity of deformations.