NDLI: On Fatigue Strength Reduction Factor: State of the Art

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On Fatigue Strength Reduction Factor: State of the Art

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Owolabi, Gbadebo Egboiyi, Benedict Whitworth, Horace Aluko, Olanrewaju
Copyright Year	2012
Abstract	Numerous theoretical models have been developed to predict the fatigue strength reduction factor (also known as fatigue notch factor), an important parameter in fatigue life prediction of notched components. These models include: the classical average stress method, the fracture mechanics method, the stress field intensity method, the strain energy method, and the weakest link method. However, most of these methods do not incorporate explicit sensitivity to materials microstructure. Accordingly, notch sensitivity remains a highly empirical subject in spite of significant advances in microstructure-sensitive modeling. This paper gives a detailed literature review of these methods and addresses their limitations. It also discusses a recently developed probabilistic method for microstructure-sensitive fatigue notch factor. The probabilistic method provides a very strong physical basis for fatigue strength reduction and associated notch sensitivity; thus it can be used to determine the effect of notches on reduction of fatigue resistance in a way that directly incorporates microstructure. The results obtained using the new probabilistic framework and other conventional methods are compared with experimental data for notched components. The probabilistic framework gives better correlation with experimental results for the notch sensitivity and notch size effect than the conventional approaches including the Neuber’s, the Peterson, and the fracture mechanics methods.
Starting Page	55
Ending Page	64
Page Count	10
File Format	PDF
ISBN	9780791845240
DOI	10.1115/IMECE2012-85893
Volume Number	Volume 8: Mechanics of Solids, Structures and Fluids
Conference Proceedings	ASME 2012 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2012-11-09
Publisher Place	Houston, Texas, USA
Access Restriction	Subscribed
Subject Keyword	Fatigue life Fracture mechanics Fatigue strength Size effect Fatigue Modeling Stress
Content Type	Text
Resource Type	Article

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