Fatigue-Crack-Propagation Rates Under Random Excitation

[+] Author and Article Information
R. Plunkett, N. Viswanathan

University of Minnesota, Minneapolis, Minn.

J. Basic Eng 89(1), 55-68 (Mar 01, 1967) (14 pages) doi:10.1115/1.3609570 History: Received August 03, 1966; Online November 03, 2011


Fatigue-crack-propagation rates have been measured for 2024-T3 aluminum cantilever beams in reversed bending under constant amplitude, two-level constant amplitude, and random excitations. For the two-level tests there is a large interaction between the crack-propagation rates caused by stress cycles of different amplitudes. The high-low sequence gives a delay and the low-high sequence a higher rate than a simple no interaction assumption would predict. This is confirmed in the random-excitation tests where the crack-propagation rate for low damping is much higher than that for high damping for exactly the same distribution and level of stress peaks.

Copyright © 1967 by ASME
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