SYMPOSIA PAPER Published: 24 August 2020

Fatigue Crack Growth and Threshold Behavior at Ultrasonic Frequencies


Fatigue crack growth (ΔaN = f(Kmax) data for several metallic materials were measured, using the 20 kHz ultrasonic resonance stressing method, and compared to 100-Hz frequency measurements. In a noncorrosive environment, a similar ΔaN = f(Kmax) dependence was found for both frequencies, Furthermore, several other features were found to be common to both, for example, (1) a ductile crack propagation mechanism. (2) a Kmax and crack-tip opening displacement-governed crack growth behavior. (3) discontinuous crack propagation, and (4) the existence of a threshold stress intensity.

Therefore, the method is thought to be a useful tool in gaining crack growth data in a manner that saves time, material, and energy. It has great practical value in the low stress-intensity regime.

Measurements in 3.5 percent sodium chloride solution show an environmental influence only at crack growth rates below about 10−9 m/cycle.

Author Information

Stanzl, S., E.
University of Vienna, Institute for Solid State Physics, Vienna, AT
Tschegg, E., K.
Technical University, Institute for Applied Physics, Vienna, AT
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Developed by Committee: E08
Pages: 3–18
DOI: 10.1520/STP791B1983001
ISBN-EB: 978-0-8031-7720-8
ISBN-13: 978-0-8031-0729-8