Forecasting the endurance limit of surface-hardened cylindrical parts made of steel 20 by the initial deformations of reference specimen

The possibility of forecasting the increment of endurance limit for solid and hollow cylindrical parts made of steel 20 with semicircular notches after outstripping superficial plastic deforming has been analyzed using the residual stresses (initial deformations) of a reference specimen hardened simultaneously with the part . It is established that the compressive residual stresses calculated in smooth parts by the initial deformations of the reference specimen differ insignificantly (less than 6%) from those found experimentally. The increments of endurance limits of hardened notched parts have been calculated by a well-known method using the average integral residual stresses criterion. It’s established that the design values of endurance limit increments differ from the experimentally found ones by no more than 15%.