8 May 1995 Crack detection in fastener holes using surface acoustic wave
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This paper presents an investigation of the monitoring of cracks at the edge of fastener holes on plates using an ultrasonic pulse-echo technique. Our studies show that, if the surface of the plate surrounding the hold is free, an acoustic wave on the surface of the plate is able to detect the cracks located in an arc of 60 degree(s). When the inner surface of the hole is free, surface acoustic waves on the inner surface are alternate choices. For the case when all these surfaces are in tight contact with other parts, hence unavailable for mounting transducers, a particular type of Lamb wave mode is presented.
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Xiao-Qi Bao, Xiao-Qi Bao, Vasundara V. Varadan, Vasundara V. Varadan, Vijay K. Varadan, Vijay K. Varadan, } "Crack detection in fastener holes using surface acoustic wave", Proc. SPIE 2443, Smart Structures and Materials 1995: Smart Structures and Integrated Systems, (8 May 1995); doi: 10.1117/12.208269; https://doi.org/10.1117/12.208269

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