Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 51, Issue -, Pages 105-115Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2013.01.005
Keywords
Notch stress theory; Microsupport factor; Fictitious notch rounding; Welded joint fatigue; Lap joint fatigue
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The microsupport effect at sharp notches subjected to high-cycle fatigue can be described according to Neuber by averaging the maximum notch stress in a small material volume (microsupport length rho*) at the notch root (radius rho). The averaged stress may be expressed by the maximum stress of a corresponding notch of an enlarged, fictitious radius, rho(f) = rho + s rho*, where s is the microsupport factor. The status of Neuber's concept within his general theory of notch stresses is reviewed, followed by more recent theoretical and application-relevant developments. The theoretical developments refer to the notch angle dependency of the support factor, to its value for pointed versus rounded notches and to in-plane shear loading with out-of-bisector crack propagation. The application developments refer to the fatigue assessment of welded joints. (C) 2013 Elsevier Ltd. All rights reserved.
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