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Lamb wave characteristics of thickness-graded piezoelectric IDT

Mahapatra, Roy D and Singhal, A and Gopalakrishnan, S (2005) Lamb wave characteristics of thickness-graded piezoelectric IDT. In: Ultrasonics, 43 (9). pp. 736-746.

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An equivalent single layer model of Lamb wave generation by thickness-graded piezoelectric IDT on host structure is developed.Various additional complexities, such as the coupling between the Lambwave modes, complicated nature of the electro-mechanical excitation are considered. The model of infinite IDT is extended to deal with the finite IDT with edge discontinuities. The effects of electromechanical coupling and thickness gradation on the wavelength shifts are investigated. The problem of electrically driven instability within the IDT is analyzed. Numerical results are reported by considering $Al_{2}O_{3}$/PZT IDT as integral part of the host structure, which show that there are significant changes and improvements in the Lamb wave characteristics due to the graded configuration. Most important among these is the reduced dispersiveness of the Lamb wave modes, which is useful in launching a SAW that propagates with narrower pulse width and less attenuation.

Item Type: Journal Article
Publication: Ultrasonics
Publisher: Elsevier Science B. V.
Additional Information: Copyright for this article belongs to Elsevier Science B.V.
Keywords: IDT;Lamb wave;FGPM;Dispersion;Stability
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 23 Nov 2007
Last Modified: 19 Sep 2010 04:20
URI: http://eprints.iisc.ac.in/id/eprint/3915

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