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Domain Switch Toughening in Polycrystalline Ferroelectrics

Published online by Cambridge University Press:  01 February 2011

Chad M. Landis
Affiliation:
Department of Mechanical Engineering and Materials ScienceRice UniversityMS 321, 6100 Main Street, Houston, TX 77005
Jianxin Wang
Affiliation:
Department of Mechanical Engineering and Materials ScienceRice UniversityMS 321, 6100 Main Street, Houston, TX 77005
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Abstract

Mode I steady crack growth is analyzed to determine the toughening due to domain switching in poled ferroelectric ceramics. A multi-axial, electromechanically coupled, incremental constitutive theory is applied to model the material behavior of the ferroelectric ceramic. The constitutive law is then implemented within the finite element method to study steady crack growth. The effects of mechanical and electrical poling on the fracture toughness are investigated. Results for the predicted fracture toughness, remanent strain and remanent polarization distributions, and domain switching zone shapes and sizes are presented. Finally, the model predictions are discussed in comparison to experimental observations.

Type
Research Article
Copyright
Copyright © Materials Research Society 2005

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