Abstract
A fatigue notch factor, β, is usually greater than 1. However, it has been reported that β is smaller than 1 in the specimen with a blunt notch. For this problem, rotating bending fatigue tests of S 20 C specimens with a blunt notch were carried out. From the observations of the slip-bands and the micro-cracks on fatigued specimens, it can be concluded that the statistical factor is the cause of β<1, although Cazaud et al pointed out that the phenomenon (β<1) is caused by the stress relief due to plastic deformation near the notch root.
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