Abstract
Rolling contact fatigue tests were carried out using plates with microholes (diameter was about 100 μm and depth was about 140 μm) under three different loads (maximum values of Hertzian stress were about 3250, 3550 and 3840 MPa, respectively) and the surface cracks initiating from those holes were observed. It was found that there is a threshold value of maximum Hertzian stress whether surface cracks originate from microholes or not, and its value is between 3250 and 3550 MPa. However, flaking failures occurred even when the stress values were lower than the threshold value. In order to investigate the relation between the flaking failures and the cracks, sectional observations of the subsurface cracks were made before and after the surface layer separations. From these observations, it was found that the subsurface cracks caused the flaking failures even when the maximum value of Hertzian stress was lower than the threshold value of surface crack initiation.
| Original language | English |
|---|---|
| Pages (from-to) | 1021-1030 |
| Number of pages | 10 |
| Journal | Fatigue and Fracture of Engineering Materials and Structures |
| Volume | 29 |
| Issue number | 12 |
| DOIs | |
| State | Published - 2006/12 |
Keywords
- Bearing
- Crack growth
- Crack initiation
- Flaking failure
- Rolling contact fatigue
ASJC Scopus subject areas
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering