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FATIGUE‐CRACK ARREST IN MILD STEEL SPECIMENS UNDER CONSTANT AMPLITUDE LOADING
Author(s) -
Pook L. P.,
Greenan A. F.
Publication year - 1984
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1984.tb00360.x
Subject(s) - materials science , amplitude , stress intensity factor , structural engineering , constant (computer programming) , paris' law , enhanced data rates for gsm evolution , crack closure , stress concentration , composite material , fatigue testing , fracture mechanics , engineering , physics , optics , telecommunications , computer science , programming language
— Unexpected arrest of long fatigue cracks was observed in mild steel single edge notch three‐point bend specimens tested under constant amplitude loading. Arrest was associated with a low, but still positive, slope of the crack length against stress intensity factor curve, and can be explained using the R ‐curve concept for fatigue‐crack growth. At a stress ratio of 0.1, the fatigue threshold was 6.6, 7.3 or 8.0 MN/m 3/2 depending on the definition of threshold used. This has obvious implications for both the development of a standard test method for the fatigue threshold and the application of data to practical problems.