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FROM:
A N Shpak (1), I Mueller (2,3), M V Golub (1) and C P Fritzen (4)
(1) Institute for Mathematics, Mechanics and Informatics, Kuban State University, 350040 Krasnodar, Russia
(2) Institute for Structural Engineering, Faculty of Civil and Environmental Engineering, Ruhr-Universität Bochum, Bochum, D-44801 Bochum, Germany
(3) Institute for Mechanics, Department for Mechatronics and Mechanical Engineering, Bochum University of Applied Sciences, D-44801 Bochum, Germany
(4) Institute for Mechanics and Control Engineering—Mechatronics, University of Siegen, D-57068 Siegen, Germany
“Theoretical and experimental investigation of Lamb waves excited by partially debonded rectangular piezoelectric transducers”, Smart Materials and Structures, Vol. 29, No. 4, 045043, April 2020, https://doi.org/10.1088/1361-665X/ab75a1
ABSTRACT: The paper proposes a new hybrid approach technique to simulate acousto-ultrasonic wave excitation and propagation due to operation of the partially debonded piezoelectric transducer attached to a plate-like structure. The semi-analytical boundary integral equation method is applied to calculate guided waves propagation in the unbounded structures and to separate different guided waves in the piezo-induced wave-fields. The obtained model is verified experimentally using the scanning laser Doppler vibrometry. Eigenfrequencies are calculated and analysed for various sizes of the transducer and for different bonding conditions between the transducer and the waveguide. The impact of the transducer's height, size and debonding area on symmetric and antisymmetric Lamb waves excitation is analysed. The paper demonstrates that one-sided debonding of the transducer exerts intense influence on the distribution of the wave energy among the excited Lamb wave modes, while center debonding has a sizable impact only at relatively high frequencies.
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