EVALUATION OF RESIDUAL STRESSES IN THE RIM OF RAILWAY WHEELS BY MECHANICAL METHOD

Abstract

Numerical evaluation of the magnitude and nature of the distribution of internal residual stresses in the surface layer of the plasma-hardened rim of a railway wheel by a mechanical (destructive) method has been carried out. The distribution of residual stresses is estimated from the magnitude of elastic deformations. It is shown that the plasma-hardened rim of a railway wheel is characterized by compressive residual stresses with an intensity of 9.0-48.2 kg/mm2 in the surface zone with a transition to residual tensile stresses with an intensity of 8.8-44.1 kg/m in the subsurface zone.

It is noted that a comparative assessment of residual stresses in a plasma-hardened sample by mechanical and X-ray methods shows the applicability of a destructive method for determining the magnitude and nature of the distribution of internal residual stresses based on measuring the magnitude of elastic deformations. The combined use of mechanical and X-ray methods will improve the accuracy of determining residual stresses in the plasma-hardened surface of heavily loaded and high-wear parts.