Geometrical effects in fatigue: a unifying theoretical model

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• 作者：Taylor ; David
• 关键词：Linear elastic fracture mechanics ; Stress concentrations ; Fatigue limit
• 刊名：International Journal of Fatigue
• 出版年：1999
• 出版时间：May, 1999
• 年：1999
• 卷：21
• 期：5
• 页码：413-420
• 全文大小：180 K

文摘

This paper presents a theory of fatigue behaviour in materials which encompasses two areas of the subject—the behaviour of cracks and the behaviour of notches—and which also accounts for size effects in these two types of geometrical feature. The basis of this theory is well established, and has been used by others to explain notch behaviour; it involves consideration of the elastic stresses over a critical distance ahead of the feature. In this paper it is shown that, by applying the same approach to cracked bodies, one can find the critical distance for a given material, avoiding the use of an empirically-derived value. This approach correctly predicts the fatigue limits of bodies containing both cracks and notches and also predicts the experimentally-observed effects of feature size on fatigue limit. It may be extended to consider differences between tensile and bending test results and the differing effects of surface treatments. The implication of this work is that there is no fundamental difference between the fatigue limit of an uncracked body—for which crack initiation is necessary—and that of a body which already contains a crack. The results are of practical value because the approach can easily be extended to cover geometrical features of any shape and size, such as occur in engineering components. Publisher: Elsevier Science Language of Publication: English Item Identifier: S0142-1123(99)00007-9 Publication Type: Article ISSN: 0142-1123 Cited by:

1. Hutson, A.L.; Nicholas, T.; Olson, S.E.; Ashbaugh, N.E.,""Effect of sample thickness on local contact behavior in a flat-on-flat fretting fatigue apparatus""International Journal of Fatigue2001pp. 445-453
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2. Atzori, B.; Lazzarin, P.; Filippi, S.,""Cracks and notches: analogies and differences of the relevant stress distributions and practical consequences in fatigue limit predictions""International Journal of Fatigue2001pp. 355-362
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3. Ciavarella, M.; Demelio, G.,""A review of analytical aspects of fretting fatigue, with extension to damage parameters, and application to dovetail joints""International Journal of Solids and Structures2001pp. 1791-1811
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4. Taylor, David; Barrett, Niall; Lucano, Gabriele,""Some new methods for predicting fatigue in welded joints""International Journal of Fatigue2002pp. 509-518
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5. Atzori, B.; Meneghetti, G.; Susmel, L.,""Estimation of the fatigue strength of light alloy welds by an equivalent notch stress analysis""International Journal of Fatigue2002pp. 591-599
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6. Makkonen, M.,""Notch size effects in the fatigue limit of steel""International Journal of Fatigue2003pp. 17-26
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7. Taylor, D.,""Comment on ""Notch Size Effects in the Fatigue Limit of Steel"" by M. Makkonen [Int J Fatigue 25 (2003) 17-26]¹""International Journal of Fatigue2003pp. 779-780
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8. Makkonen, M.,""Response to comments by Prof. Taylor on ""Notch Size Effects in the Fatigue Limit of Steel"" by M. Makkonen [Int J Fatigue 25 (2003) 17-26]²""International Journal of Fatigue2003pp. 781-783
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9. Nowell, D.; Duo, P.; Stewart, I.F.,""Prediction of fatigue performance in gas turbine blades after foreign object damage""International Journal of Fatigue2003pp. 963-969
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10. Armstrong, Jeremy; Degoricija, Lovorka; Hildebrand, Anthony; Koehne, Jessica; Fleming, Patrick E.,""The ionization energies of the isomers of CN₂""Chemical Physics Letters2000pp. 591-596
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Footnotes:

1. PII of original article: S0142-1123(02)00053-1.