Anisotropy of the Fatigue Limit and of the Crack Propagation Property of a Rolled Steel Plate

概要

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The main purpose of this paper is to make a study of anisotropy of fatigue limit and of the crack propagation property of a rolled steel plate by observing the fatigue process. A series of rotating bending fatigue tests were carried out by use of plain specimens and specimens with a small hole, cut out of a rolled steel plate. The main results obtained are as follows : 1) The fatigue limit of a plain specimen cut out in the rolling direction depends on the propagating condition of the microscopic nonpropagating cracks occurring along slip bands or grain boundaries, while that of a plain specimen cut out in the plate-thickness direction depends on the propagating condition of the ones occurring from inclusions. 2) Anisotropy of the crack propagating velocity of a specimen cut out in the plate-thickness direction is hardly observed under such a condition that only a single crack propagates preferentially, while it condition that only a single crack propagates preferentially, while it is remarkably observed under such a condition that the main crack propagates, combining the micro-cracks initiated from inclusions.
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