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Mechanism of electric fatigue crack growth in lead zirconate titanate

Westram, Ilona and Oates, William S. and Lupascu, Doru C. and Rödel, Jürgen and Lynch, Christopher S. (2007):
Mechanism of electric fatigue crack growth in lead zirconate titanate.
55, In: Acta Materialia, (1), pp. 301-312, ISSN 13596454, [Online-Edition: http://dx.doi.org/10.1016/j.actamat.2006.08.029],
[Article]

Abstract

A series of experiments was performed with through-thickness cracks in ferroelectric double cantilever beam (DCB) specimens. Cyclic electric fields of different amplitudes were applied which resulted in cyclic crack propagation perpendicular to the electric field direction. Crack propagation was observed optically and three regimes were identified: a pop-in from a notch, steady-state crack growth and a decrease of the crack growth rate with increasing cycle number. Crack growth only occurred if the applied field exceeded the coercive field strength of the material. Furthermore, the crack extended during each field reversal and the crack growth rate increased with increasing field. Based on the experimental observations, a mechanistic understanding was developed and contrasted with a nonlinear finite element analysis which quantified the stress intensity in the DCB specimens. The driving forces for crack formation at the notch and subsequent fatigue crack growth were computed based on the distribution of residual stresses due to ferroelectric switching. The finite element results are in good agreement with the experimental observations and support the proposed mechanism.

Item Type: Article
Erschienen: 2007
Creators: Westram, Ilona and Oates, William S. and Lupascu, Doru C. and Rödel, Jürgen and Lynch, Christopher S.
Title: Mechanism of electric fatigue crack growth in lead zirconate titanate
Language: English
Abstract:

A series of experiments was performed with through-thickness cracks in ferroelectric double cantilever beam (DCB) specimens. Cyclic electric fields of different amplitudes were applied which resulted in cyclic crack propagation perpendicular to the electric field direction. Crack propagation was observed optically and three regimes were identified: a pop-in from a notch, steady-state crack growth and a decrease of the crack growth rate with increasing cycle number. Crack growth only occurred if the applied field exceeded the coercive field strength of the material. Furthermore, the crack extended during each field reversal and the crack growth rate increased with increasing field. Based on the experimental observations, a mechanistic understanding was developed and contrasted with a nonlinear finite element analysis which quantified the stress intensity in the DCB specimens. The driving forces for crack formation at the notch and subsequent fatigue crack growth were computed based on the distribution of residual stresses due to ferroelectric switching. The finite element results are in good agreement with the experimental observations and support the proposed mechanism.

Journal or Publication Title: Acta Materialia
Volume: 55
Number: 1
Uncontrolled Keywords: Ferroelectricity; Fracture; Finite element analysis; Electroceramics
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 18 May 2011 15:19
Official URL: http://dx.doi.org/10.1016/j.actamat.2006.08.029
Identification Number: doi:10.1016/j.actamat.2006.08.029
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