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Proceedings Paper

Effective moduli and electro-acoustic performance of epoxy-ceramic 1-3 piezocomposites
Author(s): Marco Avellaneda; Pieter J. Swart
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Paper Abstract

The inclusion of piezoceramic rods in a passive polymer can greatly enhance the piezoelectric effect. We analyze this phenomenon from the point of view of the theory of composite materials, focusing on the evaluation of dh, the hydrostatic piezo-electric coefficient, dhgh, the hydrophone figure of merit, and kh, the hydrostatic coupling factor measuring the efficiency of energy conversion. We show how these quantities can be expressed as algebraic functions of a single microstructural parameter, p. In the limit of large elastic contrast (soft matrix, hard ceramic), this theory gives a first-principles explanation of the decoupling effect of the composite on the hydrostatic piezo-electric coefficient, as well as the role played by the porosity and Poisson's ratio of the matrix phase. Using a differential effective medium type scheme, we compute the aforementioned properties for two commercial polymer-piezoceramic composites. It is thus shown that this effective medium approach provides a simple yet self-consistent framework for the design of effective 1-3 piezocomposites.

Paper Details

Date Published: 1 May 1994
PDF: 9 pages
Proc. SPIE 2192, Smart Structures and Materials 1994: Mathematics and Control in Smart Structures, (1 May 1994); doi: 10.1117/12.174231
Show Author Affiliations
Marco Avellaneda, Courant Institute of Mathematical Sciences/NYU (United States)
Pieter J. Swart, Courant Institute of Mathematical Sciences/NYU (United States)


Published in SPIE Proceedings Vol. 2192:
Smart Structures and Materials 1994: Mathematics and Control in Smart Structures
H. Thomas Banks, Editor(s)

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