Resonant Modes in Piezoelectric PZT Rod-Polymer Composite Materials

The objective of the present work was to gain a deeper understanding of the vibration behavior of piezoelectric composite materials composed of PZT rods arranged in a periodic square lattice in a polymer matrix. Electrical admittance measurements and lalet probe dilatometry of the dynamic displacement on the composite surface were used to investigate t he vibration pattern of resonant modes. The effect of temperature on the electromechanical properties of the composite has also been studied as a function of frequency. The implication of these results for the design optimization of ultrasonic transducers are discussed.