453 転がり疲労下における微小穴を付与した軸受鋼の表面き裂発生進展挙動(GS-11 き裂(2))  [in Japanese] 453 Surface Crack Growth from Artificial Defects in SUJ2 under Rolling Contact Fatigue  [in Japanese]

Understandig the surface crack growth is important to clarify the mechanisms of rolling contact fatigue (RCF) of SUJ2, because the surface defects are made by indentations and cause flaking failure. In the present work, the small holes were artificially made prior to the RCF tests and the initiation and propagation of the surface cracks from the holes were observed. Based on the features obtained by the experiments, the initiation and propagation of the cracks were evaluated by calculating stress intensity factors.