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

Marco Avellaneda; Pieter J. Swart

doi:10.1117/12.174231

1 May 1994 Effective moduli and electro-acoustic performance of epoxy-ceramic 1-3 piezocomposites

Marco Avellaneda, Pieter J. Swart

Proceedings Volume 2192, Smart Structures and Materials 1994: Mathematics and Control in Smart Structures; (1994) https://doi.org/10.1117/12.174231
Event: 1994 North American Conference on Smart Structures and Materials, 1994, Orlando, FL, United States

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 d_h, the hydrostatic piezo-electric coefficient, d_hg_h, the hydrophone figure of merit, and k_h, 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.

Citation Download Citation

Marco Avellaneda and Pieter J. Swart "Effective moduli and electro-acoustic performance of epoxy-ceramic 1-3 piezocomposites", Proc. SPIE 2192, Smart Structures and Materials 1994: Mathematics and Control in Smart Structures, (1 May 1994); https://doi.org/10.1117/12.174231

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