Near-threshold fatigue behaviors of small shear cracks in bearing steel

D. Koyanagi; N. Shomura; M. Endo; H. Matsunaga; S. Moriyama

doi:10.1117/12.851637

14 April 2010 Near-threshold fatigue behaviors of small shear cracks in bearing steel

D. Koyanagi, N. Shomura, M. Endo, H. Matsunaga, S. Moriyama

Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 752203 (2010) https://doi.org/10.1117/12.851637
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore

Abstract

Failures of engineering components caused by rolling contact fatigue, such as flaking in bearings, are closely related to the initiation and growth of share-mode, i.e. Modes II and III, fatigue cracks. In order to evaluate quantitatively the fatigue strength of those components, it is necessary to elucidate the propagation and threshold behaviors of share-mode cracks, particularly for small cracks, on the basis of fracture mechanics. In this study, fatigue tests of fully-reversed cyclic torsion superposed upon static compression were carried out using SAE52100 bearing steel shafts into which semi-elliptical cracks smaller than 1 mm in size were initially introduced in the axial direction. Propagation and nonpropagation of shear-mode fatigue cracks were controlled by changing the torsional stress amplitude. The threshold stress intensity factor (SIF) range for a share-mode crack was defined at the minimum stress required for crack propagation. Crack face interference was responsible for the reduction in crack driving force. An intrinsic value of threshold SIF range that does not include the effect of crack face interference was obtained to be approximately 13 MPa⁺m^0.5.

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D. Koyanagi, N. Shomura, M. Endo, H. Matsunaga, and S. Moriyama "Near-threshold fatigue behaviors of small shear cracks in bearing steel", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 752203 (14 April 2010); https://doi.org/10.1117/12.851637

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KEYWORDS

Surface finishing

Mechanics

Polishing

Analytical research

Heat treatments

Current controlled current source

Experimental mechanics

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