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Proceedings Paper

Finite element model of ferroelectric/ferroelastic polycrystals
Author(s): Stephen C. Hwang; Robert M. McMeeking
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Paper Abstract

A finite element model of polarization switching in a polycrystalline ferroelectric/ferroelastic ceramic is developed. It is assumed that a crystallite switches if the reduction in potential energy of the polycrystal exceeds a critical energy barrier per unit volume of switching material. Each crystallite is represented by a finite element with the possible dipole directions assigned randomly subject to crystallographic constraints. The model accounts for both electric field induced switching and stress induced switching with piezoelectric interactions. Experimentally measured elastic, dielectric, and piezoelectric constants are used consistently, bu different effective critical energy barriers are selected phenomenologically. Electric displacement versus electric field, stress versus strain, and stress versus electric displacement loops of a ceramic lead lanthanum zirconate titanate are modeled well below the Curie temperature.

Paper Details

Date Published: 14 June 2000
PDF: 14 pages
Proc. SPIE 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics, (14 June 2000); doi: 10.1117/12.388224
Show Author Affiliations
Stephen C. Hwang, Forschungszentrum Juelich GmbH (United States)
Robert M. McMeeking, Univ. of California/Santa Barbara (United States)

Published in SPIE Proceedings Vol. 3992:
Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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