Abstract
Ultrasonic waves have a long history in detection of surface breaking cracks. Attempts are being made to use guided waves as a defect detection tool in aging skin structures in aircrafts and in the power generation industries as these waves offer a great advantage over conventional bulks waves. Guided waves can be excited at one position and allowed to propagate considerable distances before attenuating. Depending on the configuration employed for defect detection, reflected or received waveforms give information regarding the integrity of the structure along the line of sight. This description makes the technique look rather simple. Particularly, NDT utilizing Lamb waves is more complex due to the existence of two or more modes at any given frequency. Success was reported by several authors on defect detection using Lamb waves. Brief or no explanation was given on the reasons behind the choice of specific excitation frequencies and incident angles. The emphasis was solely on the defect detection aspects.
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References
Ditri, J.J., Rose, J.L., Chen, G., “Mode Selection Criteria for Defect Detection Optimization using Lamb Waves,” Review of Progress in QNDE, Vol.11, 1991.
Cho, Y and Rose, J.L., “A Boundary Element Solution for a Mode Conversion Study on the Edge Reflection of Lamb Waves,” to be published in J.A.S.A., 1995.
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Rajana, K.M., “Some Theoretical and Experimental Aspects for the use of Guided Waves for the NDI of Aging Aircraft Skin Strucutres,” Ph.D. Thesis, Pennsylvania State University, 1995.
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© 1996 Plenum Press, New York
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Rajana, K.M., Cho, Y., Rose, J.L. (1996). Utility of Lamb Waves for Near Surface Crack Detection. In: Thompson, D.O., Chimenti, D.E. (eds) Review of Progress in Quantitative Nondestructive Evaluation. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0383-1_31
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DOI: https://doi.org/10.1007/978-1-4613-0383-1_31
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4613-8027-6
Online ISBN: 978-1-4613-0383-1
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