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Small Fatigue Crack Behavior in 7075-T651 Aluminum as Monitored with Rayleigh Wave Reflection

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Abstract

Small fatigue crack growth in 7075-T651 aluminum is periodically monitored with an ultrasonic Rayleigh wave technique. The wideband reflection signals are digitized and stored in the computer memory to permit the signal processing in the frequency domain. With the help of the constructed three-dimensional (3-D) reflection coefficient, the reflection amplitude spectra yield the measurements of the crack depth, if larger than 0.062 mm, and the crack closure stress. Acoustically obtainedda/dN-ΔK eff relations describe the anomalous growth behavior of small surface crack, extending from the late small crack regime to the large crack regime passing through the minimum growth rate. The split spectrum processing proves to be useful in removing the grain noises to illuminate the target echoes, which is necessary to detect the nucleation and characterize the cracks smaller than 0.1 mm in depth. Discussions on the computer-controlled, automated,in situ monitoring system are provided.

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Authors and Affiliations

  1. Faculty of Engineering Science, Osaka University, Toyonaka, 560, Osaka, Japan

    M. Hirao (Associate Professor) & H. Fukuoka (Professor)

  2. Keihanna Research Laboratory, Shimazu Corporation, Seika, 619-02, Kyoto, Japan

    K. Tojo

Authors
  1. M. Hirao
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  2. K. Tojo
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  3. H. Fukuoka
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Additional information

K. TOJO, formerly Graduate Student,

K. TOJO, formerly Graduate Student,

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Hirao, M., Tojo, K. & Fukuoka, H. Small Fatigue Crack Behavior in 7075-T651 Aluminum as Monitored with Rayleigh Wave Reflection. Metall Trans A 24, 1773–1783 (1993). https://doi.org/10.1007/BF02657852

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  • DOI: https://doi.org/10.1007/BF02657852

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