Shear mode threshold for a small fatigue crack in a bearing steel

Hisao Matsunaga, N. Shomura, S. Muramoto, M. Endo

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The fatigue behaviour of small, semi-elliptical surface cracks in a bearing steel was investigated under cyclic shear-mode loading in ambient air. Fully reversed torsion was combined with a static axial compressive stress to obtain a stable shear-mode crack growth in the longitudinal direction of cylindrical specimens. Non-propagating cracks less than 1 mm in size were obtained (i) by decreasing the stress amplitude in tests using notched specimens and (ii) by using smooth specimens in constant stress amplitude tests. The threshold stress intensity factor ranges, ΔKIIth and ΔKIIIth, were estimated from the shape and dimensions of non-propagating cracks. Wear on the crack faces was inferred by debris and also by changes in microstructure in the wake of crack tip. These effects resulted in a significant increase in the threshold value. The threshold value decreased with a decrease in crack size. No significant difference was observed between the values of ΔK IIth and ΔKIIIth.

Original languageEnglish
Pages (from-to)72-82
Number of pages11
JournalFatigue and Fracture of Engineering Materials and Structures
Volume34
Issue number1
DOIs
Publication statusPublished - Jan 1 2011

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Bearings (structural)
Steel
Cracks
Compressive stress
Debris
Stress intensity factors
Crack tips
Torsional stress
Crack propagation
Wear of materials
Fatigue cracks
Fatigue of materials
Microstructure
Air

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Shear mode threshold for a small fatigue crack in a bearing steel. / Matsunaga, Hisao; Shomura, N.; Muramoto, S.; Endo, M.

In: Fatigue and Fracture of Engineering Materials and Structures, Vol. 34, No. 1, 01.01.2011, p. 72-82.

Research output: Contribution to journalArticle

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