On the Decrease of Fatigue Limit Due to Small Prestrain

[+] Author and Article Information
Y. Nagase

Department of Mechanical Engineering, Shizuoka University, Johoku, Hamamatsu, 432 Japan

S. Suzuki

Toyoda Automatic Loom Works, LTD., Kyowa-cho, Ohbu, 474 Japan

J. Eng. Mater. Technol 114(3), 317-322 (Jul 01, 1992) (6 pages) doi:10.1115/1.2904179 History: Received October 27, 1989; Revised January 16, 1992; Online April 29, 2008


Fatigue behavior of plain specimens of low carbon steel subjected to small tensile prestrain is investigated through rotating bending tests and the mechanism of the decrease of fatigue limit due to the prestrain is discussed. It is found that 3 percent prestraining causes the acceleration of both slip and crack initiations, and increases the growth rate of a small surface crack of less than 0.3 mm. It also decreases the fatigue limit. If prestrained material is aged, the fatigue limit increases. These effects of the small prestrain are explained based on the unpinning of locked dislocations due to the prestrain.

Copyright © 1992 by The American Society of Mechanical Engineers
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