銅めっき応力測定法による横孔を有する軸の応力集中の緩和について

概要

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In this paper the bending of a shaft with a transverse hole countersunk by a drillhas been investigated experimentally by means of the electroplating method. The experi- ment shows the mitigation of stress concentration resulting from countersinking a holeand the distribution of stresses in the neighborhood of the countersunk hole edge.The greatest strength of a shaft is obtained by getting the most suitable depth ofcountersinking and its stress concentration factor approaches the theoretical value 3 foran infinitely small hole in a tension field. In the bore, the stress concentrates atfour points on the cross section containing the axis of a hole and at a small distancebelow the countersink. A drill of point angle 90° and 118° are used in countersinkinga hole, and it is found that the former is more effective than the latter in miti- gating stress concentration.