TY - JOUR
T1 - Calculating the performance of 1-3 piezoelectric composites for hydrophone applications
T2 - An effective medium approach
AU - Avellaneda, Marco
AU - Swart, Pieter J.
N1 - Copyright:
Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.
PY - 1998/3
Y1 - 1998/3
N2 - A new is presented for evaluating the performance of 1-3 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(h), the hydrostatic figure of merit d(h)g(h), and the hydrostatic electromechanical coupling coefficient k(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(h), d(h)g(h), and k(h) for polymer/piezoelectric ceramic systems at varying compositions. Several examples involving Pb (Zr, Ti)O3 and (Pb,Ca)TiO3 piezoelectric ceramics are given to illustrate the theory.
AB - A new is presented for evaluating the performance of 1-3 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(h), the hydrostatic figure of merit d(h)g(h), and the hydrostatic electromechanical coupling coefficient k(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(h), d(h)g(h), and k(h) for polymer/piezoelectric ceramic systems at varying compositions. Several examples involving Pb (Zr, Ti)O3 and (Pb,Ca)TiO3 piezoelectric ceramics are given to illustrate the theory.
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U2 - 10.1121/1.421306
DO - 10.1121/1.421306
M3 - Article
AN - SCOPUS:0031943986
SN - 0001-4966
VL - 103
SP - 1449
EP - 1467
JO - Journal of the Acoustical Society of America
JF - Journal of the Acoustical Society of America
IS - 3
ER -