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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.

Keywords

single crystals ferroelectric fracture partial electrode

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Crack Initiation at Electrode Edges in PZN-4.5%PT Single Crystals

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