Observations of the effect of varying Hoop stress on fatigue failure and the formation of white etching areas in hydrogen infused 100Cr6 steel rings

Shravan Janakiraman, Ole West, Peder Klit, Niels Steenfeldt Jensen

Research output: Contribution to journalJournal articleResearchpeer-review


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.
Original languageEnglish
JournalInternational Journal of Fatigue
Pages (from-to)128-140
Number of pages13
Publication statusPublished - 2015


  • 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

Cite this