Abstract
Bearing tests were carried out under various loading conditions for SUJ2, and the morphologies of flaking failures caused by rolling contact fatigue were investigated by surface and 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. Using this method, the length and width of flaking failures were also investigated.
