Abstract
A general framework for the analysis of both short and long cracks is presented which relies importantly on crack closure. The analysis indicates that the growth of very short cracks is length independent. Since closure decreases with an increase in mean stress level it should become more difficult to arrest cracks as the mean stress level increases. Since in steels the closure level decreases with an increase in strength level, the range over which arrested crack growth can occur will be decreased. In fact in the absence of crack closure arrested crack growth should not occur.
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