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Multifrequency piezoelectric composites: one-dimensional modeling

AutorSánchez, S.; Montero de Espinosa Freijo, Francisco; Lamberti, N.
Palabras clavePiezoelectric composites
Ultrasonic Transducers
Fecha de publicaciónfeb-1999
CitaciónUltrasonics 37(2): 97-105 (1999)
ResumenIt has been proposed that multifrequency piezoelectric composites increase the bandwidth of the standard piezocomposite configurations. The geometrical approach consists of the use of piezoelectric elements with different width-to-thickness ratios in the same polymer matrix. A one-dimensional modeling of these new structures can be made, performing an homogenization of the overall composite parameters by linking Onoe's coupling mode theory with standard one-dimensional composite models. A strong approximation must be introduced to define a 'virtual' c13 elastic constant. The model accurately predicts the transducer behaviour of 2–2 standard piezocomposites with piezoceramic elements having a width-to-thickness ratio w:t between 0 and 0.8. In the case of double composites, the coupling between the different resonators, explained by a physical model, is made empirically introducing a mutual induction coefficient between the inductances of their respective equivalent circuits. The computed and experimental results show the usefulness of the double design.
DescripciónFinal full-text version of the paper available at: http://www.sciencedirect.com/science/journal/0041624X.
Versión del editorhttp://dx.doi.org/10.1016/S0041-624X(98)00048-1
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