Crack Initiation at Electrode Edges in PZN-4.5%PT Single Crystals
Publication Type:
Journal
Authors:
Co-Authors:
Liu, T., Wan, S., and Lynch, C.S.
Year Published:
2005
Abstract:
Fringing electric fields emanating from an electrode edge in electromechanically coupled materials can potentially lead to cracking from a strain incompatibility of the active and inactive regions. Partial electrodes and specimen geometry are studied in single crystal PZN-4.5%PT to characterize the fracture behavior near an electrode edge. Crack growth was characterized by varying the specimen thickness (t 1/4 0.7 and 2 mm) and electrode coverage (50-95%). An applied electric field of 3 MV/m was required to initiate cracks in the 0.7-mm specimens, while an electric field of 2 MV/m was required to initiate cracks in the 2 mm thick specimens. Linear elastic finite element modeling was used to determine the field quantities near the electrode edge and evaluate the internal energy density.
Journal:
Journal of intelligent Material Systems and Structures
Volume:
16
Issue:
4
Pagination:
373-379
ISSN:
Short Title:
Date Published:
4/1/2005