Dynamic properties of 2.2 PZT-polymer composites

1.3 or 2.2 composites made respectively of PZT rods or lamella embedded in a polymer matrix have been proven to be efficient materials for ultrasonic transducers. A new modelling approach taking into account explicitly the stress-transfer at the PZT rod-matrix interface is proposed. It is based on a simple description of the drag force of the polymer-matrix acting on the ceramic. This drag force is applied as shear stresses at the interface. The dispersion curves relative to the various thickness and lateral periodicity related modes are established. The theoretical results are compared to experimental data obtained on 2.2 composite samples characterized both electrically and with the LDV technique