Abstract
The influence of microstructure on the growth behavior of small fatigue cracks in dual-phase steel was investigated using about fifteen plain specimens for each stress level under rotating bending. The minimum crack length above which the small-crack growth law (dl/dN=Cl) is applicable was evaluated statistically. The small-crack growth law holds in most growth process, including the range where the crack growth rate fluctuates due to the influence of microstructure, provided mean crack growth rate is considered statistically. That is, the minimum crack length for the application of the growth law is nearly equal to the initial crack size. Therefore, the scatter of the crack growth rate and the distribution of fatigue life can be evaluated through the statistical properties of the value of C.
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