415 Cross-sectional observation of flaking failure caused by rolling contact fatigue and evaluation of the stress intensity factor.

Abstract

Bearing tests were carried out under various loading conditions for bearing steel SUJ2, and the morphology of flaking failures caused by rolling contact fatigue were investigated by cross-sectional observation. It was found that the depth of flaking failure tended to be smaller than that was estimated by the conventional method based on the maximum shearing stress. A new method to estimate the depth of flaking failure based on stress intensity factor K_<II> of subsurface crack was proposed in this paper. It was confirmed that the depth estimated by this method was closer to the actual depth than estimated by conventional method.