TY - JOUR
T1 - Mode-selective excitation and detection of ultrasonic guided waves for delamination detection in laminated aluminum plates
AU - Shelke, Amit
AU - Kundu, Tribikram
AU - Amjad, Umar
AU - Hahn, Katrin
AU - Grill, Wolfgang
N1 - Funding Information:
Manuscript received august 12, 2010; accepted december 6, 2010. Partial financial support for this research from the air Force office of scientific research (aFosr, award #Fa9550, Program Manager dr. david stargel) is acknowledged by T. Kundu. W. Grill gratefully acknowledges support from the European Union under the 7th Framework Program within aIsha II (aircraft Integrated structural health assessment II, EU-FP7-cP 212912). Financial support from the humboldt Foundation of Germany to T. Kundu and a. shelke for their stay in Germany is also gratefully acknowledged. a. shelke and T. Kundu are with the department of civil Engineering and Engineering Mechanics, University of arizona, Tucson, aZ (e-mail: [email protected]).
PY - 2011/3
Y1 - 2011/3
N2 - Selective modes of guided Lamb waves are generated in a laminated aluminum plate for damage detection using a broadband piezoelectric transducer structured with a rigid electrode. Appropriate excitation frequencies and modes for inspection are selected from theoretical and experimental dispersion curves. Dispersion curves are obtained experimentally by short time Fourier transform of the transient signals. Sensitivity of antisymmetric and symmetric modes for delamination detection are investigated. The antisymmetric mode is found to be more reliable for delamination detection. Unlike other studies, in which the attenuation of the propagating waves is related to the extent of the internal damage, in this investigation, the changes in the time-of-flight (TOF) of guided Lamb waves are related to the damage progression. The mode conversion phenomenon of Lamb waves during progressive delamination is investigated. Close matching between the theoretical and experimentally derived dispersion curves and TOF assures the reliability of the results presented here.
AB - Selective modes of guided Lamb waves are generated in a laminated aluminum plate for damage detection using a broadband piezoelectric transducer structured with a rigid electrode. Appropriate excitation frequencies and modes for inspection are selected from theoretical and experimental dispersion curves. Dispersion curves are obtained experimentally by short time Fourier transform of the transient signals. Sensitivity of antisymmetric and symmetric modes for delamination detection are investigated. The antisymmetric mode is found to be more reliable for delamination detection. Unlike other studies, in which the attenuation of the propagating waves is related to the extent of the internal damage, in this investigation, the changes in the time-of-flight (TOF) of guided Lamb waves are related to the damage progression. The mode conversion phenomenon of Lamb waves during progressive delamination is investigated. Close matching between the theoretical and experimentally derived dispersion curves and TOF assures the reliability of the results presented here.
KW - Acoustics
KW - Aluminum
KW - Delamination
KW - Dispersion
KW - Electrodes
KW - Piezoelectric transducers
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U2 - 10.1109/TUFFC.2011.1839
DO - 10.1109/TUFFC.2011.1839
M3 - Article
C2 - 21429847
AN - SCOPUS:79952948886
SN - 0885-3010
VL - 58
SP - 567
EP - 577
JO - IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
JF - IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
IS - 3
M1 - 5733258
ER -