Investigation for small shear-mode fatigue cracks in bearing steels

S. Okazaki, A. Kusaba, H. Matsunaga, M. Endo

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Since flaking and spalling caused by rolling contact fatigue associate with a small crack,a special testing method and machine are required to study the small fatigue crack behavior undershear mode loading. It was found by authors that the behaviors of small shear-mode fatigue cracksfrom the inclusions and from the artificial defects could be successfully observed by applying thefully-reversed torsion coupled with static axial compressive stress. However, the servo-hydraulicfatigue testing machine is quite expensive for purchase and maintenance, and large installationspace is necessary for the hydraulic and cooling systems. Moreover, the presence of axialcompression significantly lowers the frequency of torsional loading, which consequently results inlow testing speed. In this study, a cost-effective, space-saving and high-speed fatigue testingmethod was newly proposed, and the shear-mode fatigue crack growth tests were carried out byusing the developed machine. Based on the obtained experimental data, the potential of the newtesting machine is discussed.

Original languageEnglish
Title of host publicationAdvanced Materials Science and Technology
PublisherTrans Tech Publications Ltd
Number of pages4
ISBN (Print)9783037856604
Publication statusPublished - 2013
Externally publishedYes
Event8th International Forum on Advanced Materials Science and Technology, IFAMST 2012 - Fukuoka City, Japan
Duration: Aug 1 2012Aug 4 2012

Publication series

NameMaterials Science Forum
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


Other8th International Forum on Advanced Materials Science and Technology, IFAMST 2012
CityFukuoka City

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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