Characterization of S-N curve in gigacycle fatigue

Q. Y. Wang; C. Bathias; N. Kawagoishi; Q. Chen

doi:10.1117/12.468825

29 May 2002 Characterization of S-N curve in gigacycle fatigue

Q. Y. Wang, C. Bathias, N. Kawagoishi, Q. Chen

Proceedings Volume 4537, Third International Conference on Experimental Mechanics; (2002) https://doi.org/10.1117/12.468825
Event: Third International Conference on Experimental Mechanics, 2002, Beijing, China

Abstract

To characterize the S-N curve form in gigacycle fatigue, five high strength low alloy steels with tensile strengths from 1500 MPa to 1800MPa were tested at very high numbers of cycles through piezoelectric fatigue test at 20 KHz. A significant change in the slope of S-N curve was observed, accompanying the transition form surface to subsurface crack initiation. The S-N diagram on these steels reveals a two-stepwise shape, and the S-N curve tends to drop down again after 10⁷ or 10⁸ cycles. The specimens continue to fail over 10⁷ stress cycles. It should be significant to realize the risk of obtaining the fatigue limit at 10⁷ cycles.

Citation Download Citation

Q. Y. Wang, C. Bathias, N. Kawagoishi, and Q. Chen "Characterization of S-N curve in gigacycle fatigue", Proc. SPIE 4537, Third International Conference on Experimental Mechanics, (29 May 2002); https://doi.org/10.1117/12.468825

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