Abstract
Fatigue life of a plain specimen is stochastic and consists mainly of the growth life of small cracks. Therefore, the distribution of fatigue life can be evaluated through the statistical properties in the growth of small cracks. In the present paper, rotating bending fatigue tests were carried out on specimens with two small blind holes in 0.42% carbon steel in order to investigate the distribution characteristics of the fatigue crack growth life based on the small-crack growth law, dl/dN=Cσa n. The distribution of crack growth life of holed specimens can be predicted through the growth law considering the statistical properties of the crack growth rate. Although the crack growth rate in a plain specimen fluctuates markedly due to the influence of the microstructure, scatter of the crack growth rate among the specimens can be evaluated through the distribution of the crack growth rate in the region where the growth behavior is mainly controlled by a mechanical parameter. That is, the distribution of fatigue life in plain specimens can be predicted through the statistical properties of the crack growth rate which are controlled by a mechanical parameter.
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