Modeling and experimental research of hardening of the cylindrical samples by method of joint elastoplastic deformation by stretching and torsion

Research of one of methods of hardening the lengthy cylindrical samples at which realization in under-surface areas of are directed compressing residual stress at the expense of consecutive plastic deforma-tion at first by a stretching, and then, at fixing of the direct strain received at a stretching, torsion is con-ducted. The mathematical model of elastoplastic deformation of constructional steel is made at a tension, characteristic for the given method of hardening. By results of the spent experimental researches adequa-cy of model is confirmed and the area of conditions of deformation in which it with admissible exactitude for practice reflects behaviour of a material is established. The technological condition ensuring optimum distribution of residual direct stresses on a cross-section of sample at minimum values of residual shear-ing stresses is developed.