1 Department of Mechanical Engineering, Technical University of Denmark2 Solid Mechanics, Department of Mechanical Engineering, Technical University of Denmark3 Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark
White etching cracks (WECs) in wind turbine gearbox bearings have been studied previously. Rolling contact fatigue (RCF) tests are conducted on 100Cr6 bearing steel rings, in this study, to generate WECs like those found in wind turbine bearings. This research studies the effect of two different levels of tensile Hoop stresses on the failure life and formation of WECs in the rings. The rings are pre-charged with hydrogen before RCF tests are conducted. It is found that these rings experience incremental fatigue failure, followed by a sudden rapid failure. The fractography, Reflecting Light Microscopy (RLM) and Scanning Electron Microscopy (SEM) results are presented in this paper.
International Journal of Fatigue, 2015, Vol 77, p. 128-140
Bearings; Hoop stress; Hydrogen charging; Rolling contact fatigue; Bearings (structural); Etching; Fracture mechanics; Friction; Hydrogen; Residual stresses; Scanning electron microscopy; Bearing steels; Fatigue failures; Research studies; White etching areas; Wind turbine gearboxes; Wind turbines