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

The George W. Woodruff School of Mechanical Engineering, The Georgia Institute of Technology, Atlanta, GA 30332-0405, USA

William S. Oates

The George W. Woodruff School of Mechanical Engineering, The Georgia Institute of Technology, Atlanta, GA 30332-0405, USA

Shan Wan

The George W. Woodruff School of Mechanical Engineering, The Georgia Institute of Technology, Atlanta, GA 30332-0405, USA

Christopher S. Lynch

The George W. Woodruff School of Mechanical Engineering, The Georgia Institute of Technology, Atlanta, GA 30332-0405, USA, chris.lynch{at}me.gatech.edu

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.

Key Words: single crystals • ferroelectric • fracture • partial electrode

Journal of Intelligent Material Systems and Structures, Vol. 16, No. 4, 373-379 (2005)
DOI: 10.1177/1045389X05050099


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