強さに異方性がある鋼材の疲れ強さの一解釈

概要

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In this paper an idea to explain the features of the fatigue strength of strength-anisotropic steels is proposed. The underlying idea is that the incipient fatigue crack, developed near surface of the specimen as a result of an occurrence of extrusions and intrusions due to fatigue stressing, spreads step by step by the cracking of the plastic zone at the root of the crack. The cracking is assumed to follow the Griffith's energy condition. The portion where the incipient crack appears differs in torsional and in bending spcimens, sihce the specimens have strength anisotropy. It is assumed that in twisted specimens a plane crack and in bent specimens a semi-circular crack propagates under the action of normal and shearing stresses. The expressions of fatigue strength obtained represent satisfactorily the experimental results made with carbon steels which are reported elsewhere.
社団法人日本機械学会の論文
1964-04-25