Westram, Ilona ; Oates, William S. ; Lupascu, Doru C. ; Rödel, Jürgen ; Lynch, Christopher S. (2007)
Mechanism of electric fatigue crack growth in lead zirconate titanate.
In: Acta Materialia, 55 (1)
doi: 10.1016/j.actamat.2006.08.029
Article, Bibliographie
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 ; Oates, William S. ; Lupascu, Doru C. ; Rödel, Jürgen ; Lynch, Christopher S. |
| Type of entry: | Bibliographie |
| Title: | Mechanism of electric fatigue crack growth in lead zirconate titanate |
| Language: | English |
| Date: | January 2007 |
| Journal or Publication Title: | Acta Materialia |
| Volume of the journal: | 55 |
| Issue Number: | 1 |
| DOI: | 10.1016/j.actamat.2006.08.029 |
| 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. |
| 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 |
| Last Modified: | 05 Mar 2013 09:47 |
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