Longitudinal crack initiation under pure rolling contact fatigue

W. Cheng, H. S. Cheng, L. M. Keer

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Pure rolling contact fatigue tests were carried out on a two-disc machine. The longitudinal cracks were initiated on the specimen surface with pure rolling and rough driving disc conditions. Cracks were easily formed from the initial longitudinal finishing grooves on the surface. The crack distribution in the wear track depended on the elaslohydrodynamic lubrication (EHL) condition. If the film thickness parameter A was less than 0.1, most of the cracks were found at the center part of the wear track. With increasing A, cracks were located towards the two sides of the wear track. When A was greater than 0.5, the initiation of surface cracks was difficult except in the region near the surface defects. Three mechanisms of crack initiation under pure rolling conditions are postulated based on the micro-macro contact mechanics and micro-EHL theory.

Original languageEnglish (US)
Pages (from-to)51-58
Number of pages8
JournalTribology Transactions
Issue number1
StatePublished - Jan 1994


  • Contact Fatigue
  • Crack Initiation

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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