Kinetics of the stress-strain state of surface hardened cylindrical specimen under complex stress state of creep

The method for calculating the boundary-value problem of the evaluation of kinetics of the stress-strain state of surface-hardened solid cylindrical specimen under creep for three types of stress state (tension, pure torsion, the combined effect of tensile load and torque) is offered. The energy theory of creep and creep rupture strength is used as base of rheological model. The algorithm for numerical solution of the problem for calculating the relaxation of residual stresses in the surface-hardened layer of cylindrical specimen under creep for all three types of stress state is developed. The intensification of relaxation of all residual stress tensor components is established. The significant redistribution of stress state along the radius depending on time is observed. The results of variable-based calculations are presented.