On the relationship and the short fatigue crack threshold |
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Authors: | A J McEVILY M ENDO Y MURAKAMI |
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Affiliation: | Department of Metallurgy, University of Connecticut, Storrs, CT 06269, USA,;Department of Mechanical Engineering, Fukuoka University, Jonan-ku, Fukuoka, 814–0180 Japan,;Department of Mechanical Engineering Science, Kyushu University, Higashi-ku, Fukuoka, 812–8581 Japan |
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Abstract: | Murakami and Endo have used the parameter to successfully predict the endurance limits and the threshold levels for components, which contain small defects or cracks. The present paper uses a modified linear–elastic fracture mechanics (LEFM) approach to examine the mechanistic basis for these correlations. The modifications include consideration of the endurance limit rather than the threshold level as a factor controlling fatigue crack growth in the very short crack growth range, consideration of elastic–plastic behaviour, and consideration of the role of crack closure in the wake of a newly formed crack. Predictions based upon the modified LEFM behaviour are found to be consistent with the earlier predictions of Murakami and Endo. |
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Keywords: | " target="_blank"> parameter model crack closure elastic–plastic behaviour endurance limit fatigue crack threshold Kitagawa–Takahashi diagram small cracks small defects |
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