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14 June 2000 Multiaxial constitutive behavior of ferroelectric materials
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Multiaxial ferroelectric/ferroelastic constitutive laws governing the behavior of ceramic lead zirconate titanate (PZT) are needed for numerical calculations of stress and electric field in the vicinity of field concentrators such as cracks, inhomogeneities, and partial electrodes. Such constitutive laws are under development and are in need of experimental verification. Multiaxial constitutive behavior has been measured using tubular specimens, both poled and unpoled. The results were used to map out a yield surface. The composition used, 8/65/35 PLZT, was found to obey a Tresca yield criterion when in the unpoled state. The yield surface was found to be a function of the polarization state. Kinematic and isotropic hardening appear to be good candidates for describing subsequent yield surfaces. The multiaxial measurements are also being used to verify and calibrate a multiaxial micromechanics based constitutive model. This constitutive model has been implemented in a finite element code written by the authors. Some of the capabilities of this code are presented and discussed. This proceedings article gives an overview of our recent research in this area.
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Christopher S. Lynch, Wei Chen, and Teiqi Liu "Multiaxial constitutive behavior of ferroelectric materials", Proc. SPIE 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics, (14 June 2000);

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