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


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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