Determination of lamb wave dispersion data in lossy anisotropic plates using time domain finite element analysis. part II : application to 2-2 and 1-3 piezoelectric composite transducer arrays

Hayward, G. and Hyslop, J. (2006) Determination of lamb wave dispersion data in lossy anisotropic plates using time domain finite element analysis. part II : application to 2-2 and 1-3 piezoelectric composite transducer arrays. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 53 (2). pp. 449-455. ISSN 0885-3010 (https://doi.org/10.1109/TUFFC.2006.1593384)

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Abstract

The use of finite element modeling, combined with optical generation and detection of Lamb waves in plate structures, was extended to encompass periodic ceramic-polymer materials typical of those encountered in 1-3 and 2-2 piezoelectric composite array transducers. The resultant dispersion data was employed to predict the occurrence of Lamb wave-induced cross talk in composite monolithic arrays. The finite element modeling method was then used to simulate the dispersion behavior of two array structures that were subsequently manufactured: a 1-D 45% volume fraction linear array coupon and a 2-D 35% volume fraction array coupon. Excellent agreement between theory and experiment was obtained using impedance measurements and laser scans of the surface displacement profile at selected frequencies. Regions of strong inter-element cross-coupling were identified and these are shown to correlate very well with the dispersion data obtained for the dual-phase plate material. This work is considered to provide a useful basis for the design of wideband monolithic composite arrays and minimization of guided wave propagation along the array substrate.

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