Wavelet Analysis of Laser-Generated Surface Waves in a Layered Structure With Unbond Regions

J. Appl. Mech 66(2), 507-513 (Oct 25, 1999) (7 pages) doi:10.1115/1.2791076 History: Received October 28, 1997; Revised July 10, 1998


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.

COPYRIGHT © 1999 by The American Society of Mechanical Engineers
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BragaMB1990Wave Propagation in Anisotropic Layered CompositesPh.D. dissertation Stanford University Stanford, CA
CastagnedeBKimKYSachseWThompsonMO1991Determination of the Elastic Constants of Anisotropic Materials Using Laser-Generated Ultrasonic SignalsJ. Appl. Phys662150157 [CrossRef]
ChaiJ-FWuTT1994Determinations of Anisotropic Elastic Constants Using Laser Generated Surface WavesJ. Acoustic Soc. Am66232323241 [CrossRef]
ChenY-C1994Dispersion of Surface Waves in an Anisotropic Layered MediumM.S. thesis National Taiwan University
ChoHOgawaSTakarnotoM1996Noncontact Laser Ultrasonics for Detecting Subsurface Lateral DefectsNDT&E International662301306 [CrossRef]
DewhurstR. JEdwardsCMcKieA. D. WPalmerS. B1987Estimation of the Thickness of Thin Metal Sheet Using Laser Generated UltrasoundAppl. Phys. Lett66210661068 [CrossRef]
DoyleP. AScalaC. M1991Ultrasonic Measurement of Elastic Constants for Composite OverlaysRev. Prog. in QNDE66214531459
EwingWMJardetzkyWSPressF1957Elastic Waves in Layered Media McGraw-Hill New York
HlawatschFBoudreaus-BartelsGF1992Linear and Quadratic Time-Frequency Signal RepresentationsIEEE Signal Process Mag.6622167 [CrossRef]
HurleyDASpicerJBConantRJTelschowKL1997Determination of the Optical Absorption Coefficient via Analysis of Laser Generated Plate WavesIEEE Ultrasonics, Ferro. Freq. Control662902908 [CrossRef]
HutchinsDALundgrenKPalmerSB1989A Laser Study of the Transient Lamb Waves in Thin MaterialsJ. Acoust. Soc. Am66214411448 [CrossRef]
JohnsonMABerthelotYHBrodeurPHJacobsLA1996Investigation of Laser Generation of Lamb Waves in Copy PaperUltrasonics662703710 [CrossRef]
KishimotoKInoueHHamadaMShibuyaT1995Time-Frequency Analysis of a Dispersive Waves by Means of Wavelet TransformASME JOURNAL OF APPLIED MECHANICS662841846 [CrossRef]
NakanoHNagaiS1991Laser Generation of Anti-symmetric Lamb Waves in Thin PlatesUltrasonics662230234 [CrossRef]
OnsayTHaddowAG1994Wavelet Transform Analysis of Transient Wave Propagation in a Dispersive MediumJ. Acoustic Soc. Am.662214411449 [CrossRef]
ProctorTMJr1982An Improved Piezoelectric Acoustic Emission TransducerJ. Acoustic Soc. Am66211631168 [CrossRef]
RioulOVetterliM1991Wavelet and Signal ProcessingIEEE Sp. Magazine Oct1438
RuskaiMBBelykinGDaubechiesIMeyerYCoifmanRMallatSRalphelL1992Wavelets and Their Applications Jones and Bartlett Boston
ScrubyCBDrainLE1990Laser Ultrasonics: Techniques and Applications IOP Publishing Ltd Bristol, UK
ScudderLPHutchinDAGuoN1996Laser-Generated Ultrasonic Guided Waves in Fiber-Reinforced Plates: Theory and ExperimentIEEE Trans. Ultra. Ferro. and Freq. Control662870880 [CrossRef]
SpicerJBMcKieADWWagnerJW1990Quantitative Theory for Laser Ultrasonic Waves in a Thin PlateAppl. Phys. Lett66218821884 [CrossRef]
StrohAN1962Steady-State Problems in Anisotropic ElasticityJ. Math. and Phys66277103 [CrossRef]
VeidtMSachseW1994Ultrasonic Point-Source/Point-Receiver Measurements in Thin SpecimensJ. Acoust, Soc. Am66223182326 [CrossRef]
WuTTChaiJ-F1994Propagation of Surface Waves in Anisotropic Solids: Theoretical Calculation and ExperimentUltrasonics6622129 [CrossRef]
WuT-TChenYC1996Dispersion of Laser Generated Surface Waves in an Epoxy-Bonded Layered MediumUltrasonics662793799 [CrossRef]
WuT-TLiuY-H1999Inverse Determinations of Thickness and Elastic Properties of a Bonding Layer Using Laser-Generated Surface WavesUltrasonics6622330 [CrossRef]




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