Effective moduli and electro-acoustic performance of epoxy-ceramic 1-3 piezocomposites

Marco Avellaneda, Pieter J. Swart

Research output: Contribution to journalConference article

Abstract

The inclusion of piezoceramic rods in a passive polymer can greatly enhance the piezoelectric effect - a fact which has been exploited in the manufacturing of sensitive pulse-echo transducers. 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 (DEM) 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.

Original languageEnglish (US)
Pages (from-to)394-402
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume2192
DOIs
StatePublished - May 1 1994
EventSmart Structures and Materials 1994: Mathematics and Control in Smart Structures - Orlando, United States
Duration: Feb 13 1994Feb 18 1994

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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