An argument for a cycle-by-cycle propagation of fatigue cracks atsmall stress intensity ranges

A model is presented in which the plastic strains around a growing fatigue crack are discretized in the form of geometrically necessary dislocations. The model explains the existence of a threshold and the near threshold regime. It also explains the minimum value of striation spacing with decreasing...

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Bibliographic Details
Published in:Acta materialia 1998-03, Vol.46 (5), p.1793-1799
Main Authors: Riemelmoser, F.O., Pippan, R., Stüwe, H.P.
Format: Article
Language:English
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Summary:A model is presented in which the plastic strains around a growing fatigue crack are discretized in the form of geometrically necessary dislocations. The model explains the existence of a threshold and the near threshold regime. It also explains the minimum value of striation spacing with decreasing amplitude of stress intensity. The model corresponds to a “cycle-by-cycle” crack growth at all amplitudes of stress.
ISSN:1359-6454
1873-2453
DOI:10.1016/S1359-6454(97)00366-2