Abstract
Based on experimental evidence from periodic plastic zone size, (PZS), measurements on growing small fatigue cracks, PZS ahead of crack tips has been suggested as a correlating parameter for small crack growth. In this paper, the PZS of small cracks are calculated by incorporating an equivalent friction stress into the BCS model. The retardation of small crack growth is considered by comparing the stress concentration ahead of blocked plastic zones to the strength of grain boundary barriers. It is demonstrated that the model can predict the growth behaviour of small cracks well and also provides reasonable predictions of fatigue lives where they are dominated by small crack growth.
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