Abstract
Plane bending fatigue tests of an annealed 0.42% carbon steel were carried out on specimens with a small blind hole and smooth specimens, with round or square cross sections, in order to investigate the effect of cross-sectional shape on the fatigue strength. The fatigue strength of a round-sectioned specimen is higher than that of a square one under the same stress. This is mainly caused by the difference in the crack growth rates. The crack growth rate can be expressed by the term σnl (small-crack growth law) in each cross-sectional shape, separately. Moreover, by transforming the nominal stress amplitude σ into the plastic strain amplitude εp using the cyclic stress-strain curve measured at the specimen surface, the crack growth rate can be uniquely determined by the term εn'pl, regardless of the shape of the cross section. Based on these results, a conventional prediction method of fatigue crack growth rate and fatigue life is proposed using the small-crack growth law and the cyclic stress strain curve.
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