This paper presents the results on the utilization of a wavelet transform to study the dispersion of laser-generated surface waves in an epoxy-bonded copper-aluminum layered specimen with and without unbond areas. Laser ultrasonic experiments based on the point-source/point-receiver (PS/PR) technique were undertaken to measure surface wave signals in a layered specimen. The wavelet transform with a Morlet wavelet function was adopted to analyze the group velocity dispersion of the surface wave signals. A novel hybrid formula for group velocity dispersion is proposed for measurements across unbond regions. Results and data obtained are in good agreement with calculated and experimental dispersion curves. The general behavior of the group velocity dispersion for different measurement, configurations can be utilized to differentiate the unbond regions in a layered structure.
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June 1999
Research-Article
Wavelet Analysis of Laser-Generated Surface Waves in a Layered Structure With Unbond Regions Available to Purchase
T.-T. Wu,
T.-T. Wu
Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan
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Y.-Y. Chen
Y.-Y. Chen
Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan
Search for other works by this author on:
T.-T. Wu
Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan
Y.-Y. Chen
Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan
J. Appl. Mech. Jun 1999, 66(2): 507-513 (7 pages)
Published Online: October 25, 1999
Article history
Received:
October 28, 1997
Revised:
July 10, 1998
Citation
Wu, T., and Chen, Y. (October 25, 1999). "Wavelet Analysis of Laser-Generated Surface Waves in a Layered Structure With Unbond Regions." ASME. J. Appl. Mech. June 1999; 66(2): 507–513. https://doi.org/10.1115/1.2791076
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