Mechanics of some degradation mechanisms in ferroelectric ceramic actuators

M.-Y. He; Zhigang Suo; Robert M. McMeeking; Anthony G. Evans; Christopher S. Lynch

doi:10.1117/12.174070

1 May 1994 Mechanics of some degradation mechanisms in ferroelectric ceramic actuators

M.-Y. He, Zhigang Suo, Robert M. McMeeking, Anthony G. Evans, Christopher S. Lynch

Proceedings Volume 2189, Smart Structures and Materials 1994: Smart Materials; (1994) https://doi.org/10.1117/12.174070
Event: 1994 North American Conference on Smart Structures and Materials, 1994, Orlando, FL, United States

Abstract

Several degradation mechanisms in ferroelectric ceramics are analyzed in this article. A ferroelectric crystal under cyclic electric field fatigues by forming a-domain bands. An energy based model is proposed, indicating that these bands are retarded by the electric field, but driven by the shear stress resolved onto the bands. The stress has been attributed to the misfit strain near the 180 degree(s) domain wall and the edge of the electrodes. A second problem is related to fracture of piezoelectric ceramics. A double-cantilever beam subjected to combined electrical and mechanical loadings is analyzed using finite elements. Also analyzed is electrode debonding, which is shown to decrease capacitance.

Citation Download Citation

M.-Y. He, Zhigang Suo, Robert M. McMeeking, Anthony G. Evans, and Christopher S. Lynch "Mechanics of some degradation mechanisms in ferroelectric ceramic actuators", Proc. SPIE 2189, Smart Structures and Materials 1994: Smart Materials, (1 May 1994); https://doi.org/10.1117/12.174070

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