Novel data obtained through experimental investigation into the fatigue response of 350WT steel, subjected to semi-random loading, comprised of various combinations of intermittent tensile overloads and compressive underloads are presented. An effective model for predicting the fatigue response is also introduced. For that, the capabilities of some of the currently available models are investigated and then an exponential delay model, being capable of accounting for the effects of not only overload ratio, but also stress ratio and overload/underload ratio is introduced. Since most variable amplitude models are based on a constant amplitude model, efforts were also expended to identify a constant amplitude fatigue crack growth model that would be easy to use, requiring the calibration of few (if any) empirical curve-fitting parameters. The integrity of a selected model is examined and results are presented.
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August 2007
Research Papers
Fatigue Response and Characterization of 350WT Steel Under Semi-Random Loading
Philip A. Rushton,
Philip A. Rushton
Research Engineer
Martec Limted
, Halifax NS, B3J 3J8, Canada
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Farid Taheri,
Farid Taheri
Professor
Department of Civil Engineering,
e-mail: farid.taheri@dal.ca
Dalhousie University
, Halifax NS, B3J 1Z1, Canada
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David C. Stredulinsky
David C. Stredulinsky
Senior Scientist
Structural Acoustics and Strength Division,
The Defence R&D Canada-Atlantic
, Dartmouth NS, B2Y 3Z7, Canada
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Philip A. Rushton
Research Engineer
Martec Limted
, Halifax NS, B3J 3J8, Canada
Farid Taheri
Professor
Department of Civil Engineering,
Dalhousie University
, Halifax NS, B3J 1Z1, Canadae-mail: farid.taheri@dal.ca
David C. Stredulinsky
Senior Scientist
Structural Acoustics and Strength Division,
The Defence R&D Canada-Atlantic
, Dartmouth NS, B2Y 3Z7, CanadaJ. Pressure Vessel Technol. Aug 2007, 129(3): 525-534 (10 pages)
Published Online: March 9, 2006
Article history
Received:
November 28, 2005
Revised:
March 9, 2006
Citation
Rushton, P. A., Taheri, F., and Stredulinsky, D. C. (March 9, 2006). "Fatigue Response and Characterization of 350WT Steel Under Semi-Random Loading." ASME. J. Pressure Vessel Technol. August 2007; 129(3): 525–534. https://doi.org/10.1115/1.2748835
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