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TECHNICAL PAPERS

Multiaxial Constitutive Behavior of Ferroelectric Materials

[+] Author and Article Information
Wei Chen, Christopher S. Lynch

The Woodruff School of Mechanical Engineering, The Georgia Institute of Technology, Atlanta, GA 30332-0405

J. Eng. Mater. Technol 123(2), 169-175 (Sep 09, 2000) (7 pages) doi:10.1115/1.1329874 History: Received September 14, 1999; Revised September 09, 2000
Copyright © 2001 by ASME
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References

Figures

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Projections of predicted yield surface of poled material in (a) (σ1−σ3)(σ1−σ3) plane and (b) π-plane. The Tresca yield surface is shown for comparison.
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Yield and saturation stresses for unpoled and poled materials are shown together with the Tresca and Mises criteria
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The offset method was used to determine the switching stress. Two offset strains are shown, one for the onset of switching and one for the onset of polarization saturation.
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(a), (b), (c) show the polarization and strain change for several possible unit cell orientations. The elongation represents the spontaneous strain. The arrow represents the polarization direction.
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(a) Measured axial stress/axial strain curves for poled PLZT and (b) axial stress/transverse strain for various tensile transverse stress levels
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(a) Measured axial stress/axial strain curves for poled PLZT and (b) axial stress/transverse strain for various compressive transverse stress levels
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(a) Measured axial stress/axial strain for unpoled PLZT and (b) axial stress/transverse strain for various transverse tensile stresses
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(a) Measured axial stress/axial strain for unpoled PLZT and (b) axial stress/transverse strain for various compressive hoop stress levels
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Stresses on the specimen in the axial, radial, and tangential directions
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Schematic of the multiaxial loading system. A load frame is used to apply the axial force to the tubular specimen. Inner and outer pressure are used to apply the radial and tangential stresses.
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The perovskite type crystal structure of lead titanate is cubic above the Curie temperature and tetragonal and polar below the Curie temperature

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