A new transverse piezoelectric mode 2-2 piezocomposite forunderwater transducer applications

摘要

In this paper, we present a new type of 2-2 piezoelectricnceramic-polymer composite operated at the transverse piezoelectric moden(TP). The new TP mode piezocomposite has exceptionally high hydrostaticnpiezoelectric response, high reliability, and can be made at low cost.nBased on the isostrain approximation, an analytical model is developednto analyze and optimize the effective piezoelectric and the effectivenelastic properties of the composite. Several composites with the newnstructure were fabricated and tested. The calculated and experimentalnresults show good agreement. It is shown that a TP 2-2 composite made ofnPZT plates in a soft polymer matrix with elastically unidirectional facenplates yields an effective hydrostatic piezoelectric coefficient dhn of 6000 (pC/N) and a hydrostatic figure of merit dhgnh higher than 30000 (10-15 m2/N)