On Crack Initiation Mechanisms in Fretting Fatigue

[+] Author and Article Information
B. Yang

Department of Aeronautics and Astronautics Air Force Research Laboratory, Wright-Patterson AFB, OH 45433 

S. Mall

Materials and Manufacturing Directorate Air Force Research Laboratory, Wright-Patterson AFB, OH 45433

J. Appl. Mech 68(1), 76-80 (May 09, 2000) (5 pages) doi:10.1115/1.1344901 History: Received September 07, 1999; Revised May 09, 2000
Copyright © 2001 by ASME
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Grahic Jump Location
Ratio of kI at θI to |kII| at θII as a function of fsp, under the condition of slip at the edge of contact. The ratio indicates the competition between the driving forces for opening-mode and shear-mode initiation of a crack.
Grahic Jump Location
Variation of θI for maximum kI and of θII for maximum |kII| with fsp, under the condition of slip at the edge of contact, predicted by the MTS criterion and by the MSS criterion, respectively. Note that θI and θII, respectively, reach their minimum values of 70.5 deg and of 0 deg at fsp=∞. The upper and lower bounds of the crack angles observed in tests are also shown for comparison with the predictions.
Grahic Jump Location
Variation of effective stress intensity factors kI and kII with angle θ, for different values of fsp. The values of kI and kII are normalized by −KI.
Grahic Jump Location
(a) Fretting contact by a rigid flat-ended punch; (b) crack analogue of the fretting contact configuration in (a). The Cartesian coordinates (x,y) and the polar coordinates (r,θ) are shown for both configurations.




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