Calculating the performance of 1{endash}3 piezoelectric composites for hydrophone applications: An effective medium approach
- Courant Institute of Mathematical Sciences, New York University, 251 Mercer Street, New York, New York 10012 (United States)
- Theoretical Division, MS-B284, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
A new method is presented for evaluating the performance of 1{endash}3 polymer/piezoelectric ceramic composites for hydrophone applications. The Poisson`s ratio effect, i.e., the enhancement of the hydrostatic performance which can be achieved by mixing piezoelectric ceramics with polymers, is studied in detail. Using an `effective medium` approach, algebraic expressions are derived for the composite hydrostatic charge coefficient d{sub h}, the hydrostatic figure of merit d{sub h}g{sub h}, and the hydrostatic electromechanical coupling coefficient k{sub h} in terms of the properties of the constituent materials, the ceramic volume fraction, and a microstructural parameter p. The high contrast in stiffness and dielectric constants existing between the two phases can be exploited to derive simple, geometry-independent approximations which explain quantitatively the Poisson`s ratio effect. It is demonstrated that the stiffness and the Poisson`s ratio of the polymer matrix play a crucial role in enhancing hydrophone performance. Using a differential scheme to model the parameter p, we evaluate d{sub h}, d{sub h}g{sub h}, and k{sub h} for polymer/piezoelectric ceramic systems at varying compositions. Several examples involving Pb(Zr,Ti)O{sub 3} and (Pb,Ca)TiO{sub 3} piezoelectric ceramics are given to illustrate the theory. {copyright} {ital 1998 Acoustical Society of America.}
- OSTI ID:
- 578057
- Journal Information:
- Journal of the Acoustical Society of America, Journal Name: Journal of the Acoustical Society of America Journal Issue: 3 Vol. 103; ISSN 0001-4966; ISSN JASMAN
- Country of Publication:
- United States
- Language:
- English
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