An Analysis of Notch-Size Effects at the Fatigue Limit

    Volume 16, Issue 4 (July 1988)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 11


    Du Quesnay, DL
    Research Assistant, Research Assistant, and Professor, University of Waterloo, Waterloo, Ontario

    Yu, MT
    Research Assistant, Research Assistant, and Professor, University of Waterloo, Waterloo, Ontario

    Topper, TH
    Research Assistant, Research Assistant, and Professor, University of Waterloo, Waterloo, Ontario

    (Received 25 February 1987; accepted 11 December 1987)

    Abstract

    This investigation examines the variation of the fatigue notch factor with notch size for sharp and blunt notches. Analytical expressions are developed to predict the fatigue notch factor for sharp notches based on short crack fracture mechanics and for blunt notches based on Neuber's rule. Experimental evidence to support these expressions is provided together with fatigue notch factors for circularly center-notched plate specimens of 2024-T351 aluminum and SAE 1045 steel. The notch diameters were varied from 0.24 to 5.0 mm. The specimens were tested in laboratory air under uniaxial constant-amplitude loading at load ratios of R = −1 and R = 0. Further experimental evidence to support the analysis is provided by data from the literature for two low carbon steels and a copper. At the fatigue limit, the fatigue notch factor increases with notch size for sharp notches. However, a notch-size effect does not occur for blunt notches. The observed notch-size effects from this and other investigations are in good agreement with the analytical expressions that are presented.


    Paper ID: JTE11081J

    DOI: 10.1520/JTE11081J

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    Author
    Title An Analysis of Notch-Size Effects at the Fatigue Limit
    Symposium , 0000-00-00
    Committee E08