RESIDUAL-STRESSES ARISING IN ELASTOPLASTIC MATERIALS DEFORMED IN ACTIVE MEDIA UNDER TORSION

Solutions to problems of pure elastoplastic torsion in surface-plastic ized and surface-hardened rods are given. The distribution of residual tangential stresses along the rod radius is shown to have an oscillat ing and sign-alternating character in both cases. In surface-plasticiz ed rods, in contrast to surface-hardened rods, the residual stresses i n the external layer always have the opposite sign with respect to the active loading stresses produced by the outer torsional moment. Concl usions have been drawn about the character of the defect structure cha nges as well as about the conditions of sample fracture under cyclic t orsional tests during the action of alternating outer force moments.