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RESEARCH PAPERS

Effects of an Artificial Small Defect on Torsional Fatigue Strength of Steels

[+] Author and Article Information
Masahiro Endo

Fukuoka University, Jonan-ku, Fukuoka, 814-01 Japan

Yukitaka Murakami

Kyushu University, Higashi-ku, Fukuoka, 812 Japan

J. Eng. Mater. Technol 109(2), 124-129 (Apr 01, 1987) (6 pages) doi:10.1115/1.3225951 History: Received July 07, 1986; Online September 15, 2009

Abstract

In order to elucidate the effect of small defects on the torsional fatigue strength of steels, reversed torsion tests were carried out on the 0.46 percent C steel specimens containing a small hole. The hole diameter ranges from 40 to 500μm. The fatigue behaviors on the specimen surface and near the hole were observed with the aid of a microscope. The torsional fatigue strength of steels containing small holes can be predicted from the results of rotating bending fatigue test by considering the threshold condition for crack propagation.

Copyright © 1987 by ASME
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