High-Frequency Fatigue of Metals and Their Cavitation-Damage Resistance

[+] Author and Article Information
A. Thiruvengadam

Hydronautics, Incorporated, Laurel, Md.

J. Eng. Ind 88(3), 332-340 (Aug 01, 1966) (9 pages) doi:10.1115/1.3670956 History: Received July 26, 1965; Online December 08, 2011


In order to verify the strain-rate effects on the correlation between strain energy of metals and their cavitation-damage resistance, high-frequency fatigue tests at 14.2 kcs were conducted using a magnetostriction oscillator. Utilizing Morrow’s theory, it has been shown that fatigue at this frequency can be quantitatively represented if a 15 percent reduction in static strain-hardening factor is made. This result shows that the strain-rate effects are relatively small (for the metals investigated) when plastic-strain energy is used as a criterion. Another result revealed by this study is the influence of corrosion on high-frequency fatigue and cavitation-damage resistance. Present experiments show that fatigue strength can be reduced significantly for SAE 1020 steel in 3 percent NaCl solution even at high frequencies, thus confirming earlier speculations on this aspect.

Copyright © 1966 by ASME
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