Contact Fatigue Damage and Fracture Failure of a Bearing Outer-Race Used on a Locomotive Wheelset
- 178 Downloads
Fracture took place on the upper-edge of one side of the bearing outer-ring used in a locomotive wheel in service, and two small pieces had separated from the outer-ring. The fractographic study indicates that the fracture mode is of instantaneous initial cracking and fatigue propagation. Fracture of the edge was caused by abnormally high contact loading on the upper-end of one race of the bearing cup. Extensive spalling is present on the upper part of the raceway of the broken side of the bearing outer-ring, and the surface contact fatigue is its primary failure mode. The occurrence of a large inclined load on the raceway of one side of outer-ring is responsible for the serious spalling damage on the raceway of the outer-ring.
KeywordsBearing outer-ring Surface contact fatigue Inclined load Spalling damage Fracture
- 1.China National Standardization Committee: Determination of carburized depth and metallographic examination of carburizing structure. GB9450. China Standard (1994) (in Chinese)Google Scholar
- 4.American Society for Metals: Metals Handbook, Fractography and Atlas of Fractographs, vol. 9, 8th edn. American Society for Metal, Metals Park (1974)Google Scholar
- 7.China Machinery Industry Federation: Specification for carburizing heat treatment rolling bearing parts. JB/T8881-2001. China Standard (2001) (in Chinese)Google Scholar