### 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 d_{h}, the hydrostatic piezo-electric coefficient, d_{h}g_{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 (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 language | English (US) |
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Pages (from-to) | 394-402 |

Number of pages | 9 |

Journal | Proceedings of SPIE - The International Society for Optical Engineering |

Volume | 2192 |

DOIs | |

State | Published - May 1 1994 |

Event | Smart Structures and Materials 1994: Mathematics and Control in Smart Structures - Orlando, United States Duration: Feb 13 1994 → Feb 18 1994 |

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### ASJC Scopus subject areas

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