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Fatigue crack detection in metallic structures with Lamb waves and 3D laser vibrometry

W J Staszewski1, B C Lee1 and R Traynor2

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The paper presents the application of ultrasonic guided waves for fatigue crack detection in metallic structures. The study involves a simple fatigue test performed to introduce a crack into an aluminium plate. Lamb waves generated by a low-profile, surface-bonded piezoceramic transducer are sensed using a tri-axis, multi-position scanning laser vibrometer. The results demonstrate the potential of laser vibrometry for simple, rapid and robust detection of fatigue cracks in metallic structures. The method could be used in quality inspection and in-service maintenance of metallic structures in aerospace, civil and mechanical engineering industries.


PACS

81.70.Cv Nondestructive testing: ultrasonic testing, photoacoustic testing

89.20.Kk Engineering

81.70.Bt Mechanical testing, impact tests, static and dynamic loads

46.80.+j Measurement methods and techniques in continuum mechanics of solids

42.62.Eh Metrological applications; optical frequency synthesizers for precision spectroscopy

46.70.De Beams, plates and shells

Subjects

Instrumentation and measurement

Optics, quantum optics and lasers

Condensed matter: structural, mechanical & thermal

Dates

Issue 3 (March 2007)

Received 30 October 2006, in final form 13 December 2006

Published 24 January 2007



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