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Investigations on Multi-axial Domain Switching Criteria for Piezoceramics

Published online by Cambridge University Press:  01 February 2011

Bernd Laskewitz ,
Dayu Zhou  and
Marc Kamlah
Bernd Laskewitz
Affiliation:
Forschungszentrum Karlsruhe GmbH Institute for Materials Research II D-76021 Karlsruhe, Germany
Dayu Zhou
Affiliation:
Forschungszentrum Karlsruhe GmbH Institute for Materials Research II D-76021 Karlsruhe, Germany
Marc Kamlah
Affiliation:
Forschungszentrum Karlsruhe GmbH Institute for Materials Research II D-76021 Karlsruhe, Germany
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Abstract

Initially unpoled soft PZT was subjected to a proportional, coaxial electromechanical loading. The ratio of compressive stress to electric field was changed between the experiments. From this series of nonlinear polarization and strain responses were obtained. Based on an offset method, initial domain switching states in the two-dimensional stress-electric field space were determined. In continuum mechanics, thin walled tubes are used to investigate multi-axial stress states. In this context, thin walled means a ratio of wall thickness to radius of 1:10 or thinner. However, simple linear dielectric analysis indicates an inhomogeneous electric field distribution in such geometries.

Therefore, the suitability of hollow cylinders (in the range from thick to thin walled tubes) for multi-axial electromechanical experiments has to be investigated. Simulations with a finite element tool based on a phenomenological constitutive model for ferroelectric and ferroelastic hysteresis behavior were performed. The results confirm inhomogeneous distributions of electric fields and stresses after poling. A geometry variation is discussed to minimize these effects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 881: Symposium CC – Coupled Nonlinear Phenomena Modeling and Simulation for Smart, Ferroic and Multiferroic Materials , 2005 , CC1.4
Copyright
Copyright © Materials Research Society 2005

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References

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