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Proceedings Paper

Computational phase-field modeling of defect interactions in ferroelectrics
Author(s): Antonios Kontsos; Wenyuan Li; Chad M. Landis
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Paper Abstract

A continuum thermodynamics framework is presented to model the evolution of domain structures in active/smart materials. To investigate the consequences of the theories, fundamental defect interactions are studied. A principle of virtual work is specified for the theory and is implemented to devise a finite element formulation. For ferroelectrics, the theory and numerical methods are used to investigate the interactions of 180° and 90° domain walls with arrays of charged defects and dislocations to determine how strongly domain walls are electromechanically pinned by the arrays of defects. Additionally, the problems of nucleation and growth of domains from crack tips, and the propagation of domain needles are studied. The importance of adaptive mesh refinement and coarsening is discussed in the context of this modeling approach.

Paper Details

Date Published: 1 April 2009
PDF: 8 pages
Proc. SPIE 7289, Behavior and Mechanics of Multifunctional Materials and Composites 2009, 72890D (1 April 2009); doi: 10.1117/12.816127
Show Author Affiliations
Antonios Kontsos, The Univ. of Texas at Austin (United States)
Wenyuan Li, The Univ. of Texas at Austin (United States)
Chad M. Landis, The Univ. of Texas at Austin (United States)


Published in SPIE Proceedings Vol. 7289:
Behavior and Mechanics of Multifunctional Materials and Composites 2009
Zoubeida Ounaies; Jiangyu Li, Editor(s)

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