Fracture Mechanics Analysis for Morphologies of Flaking Failures Caused by Rolling Contact Fatigue

• Published in: Transactions of the Japan Society of Mechanical Engineers Series A Vol. 70; no. 689; pp. 162 - 167
• Main Authors: TANABE, Hirotaka, MIYOSHI, Yoshio, TAKAMATSU, Tohru, HAYASHI, Yasutoshi
• Format: Journal Article
• Language: English; Japanese
• Published: The Japan Society of Mechanical Engineers 2004
• Subjects: Contact Problem; Fatigue; Flaking Failure; Fracture Mechanics; Rolling Bearing; Stress Intensity Factor; Tribology
• ISSN: 0387-5008; 1884-8338
• DOI: 10.1299/kikaia.70.162

Ball-on-plate type rolling contact fatigue tests for a bearing steel JIS-SUJ 2 were carried out, and the influences of the applied load on the morphologies of the flaking failure were investigated.In order to try to describe the morphologies, stress intensity factor range ΔKII, ΔKIII. for the subsurface crack subjected to cyclic loading of contact stress were estimated by using a simplified crack model. It was found that ΔKII for a crack with a fixed radius indicated a maximum value at a certain depth, and the depth agreed well with the maximum flaking depth obtained experimentally. The length and the width of the flaking failure were also discussed by the variations of ΔKII, ΔKIII. with the change of the crack radius. The flaking width estimated from the comparison of ΔKIII and its threshold value for fatigue crack growth was considerably close to experimental value.