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- Title
PRIZE FOR BEST PAPER VOLUME 28.
- Authors
Kida, K.; Sato, M.; Kitamura, K.
- Abstract
Flaking failure caused by surface cracks of silicon nitride ceramic bearings has been investigated from the viewpoint of the ring crack model. However, the relation between surface and subsurface cracks under rolling contact fatigue is not fully understood. In this investigation subsurface cracks branching from an initial surface crack were observed in detail, and the process of flaking failure was investigated. The specimens were observed prior to the separation of the surface layers and it was found that the initial surface cracks grew vertically to the surfaces and did not curve as predicted by the ring crack model. Subsurface cracks branched from the single surface cracks and grew in a direction parallel to the surface. They grew in both the same and opposite directions to the ball movement, with small upward and downward branches. These subsurface cracks grew prior to the semi-circular surface cracks. From these observations it was concluded that the flaking failures are not caused directly by surface cracks, but by subsurface cracks that branch from them.
- Subjects
CERAMIC bearings; SILICON nitride; KINEMATICS of machinery; ROLLING contact; GEARING machinery interference; BEARINGS (Machinery)
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2006, Vol 29, Issue 12, p1083
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/j.1460-2695.2006.01085.x