31 May 1996 Linear and nonlinear behavior of piezoelectric materials
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Abstract
In this study an analytic and experimental effort is presented to understand and improve the fracture toughness and the associated fatigue behavior of piezoceramic materials. Analytical models are presented on the premise that defects in the form of voids cause material degradation during electric excitation. A unit cell approach employing an exact linear electroelastic analysis is used to study the stress and electric field concentrations as a function of material properties. Our study indicates that for certain ratios of piezoelectric coefficients electric field induced stress concentrations are eliminated in the material. These results suggest that the electric fatigue life of a piezoelectric ceramic can be extended if the piezoelectric properties are appropriately tailored during the manufacturing processes. However, this analytical work is done within the frame work of linear piezoelectricity. To better understand internal stress concentrations arising due to nonlinear phenomena associated with polarization switching, we present experimental results using moire interferometer. This first application of moire interferometer to piezoceramics demonstrates the promise this experimental technique offers to better understand internal stress/strain distributions. In this initial presentation we present two fundamental results, that is the strain concentrations between domains oriented 180 and 90 degrees apart.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. B. Park, Sung S. Park, and Gregory Paul Carman "Linear and nonlinear behavior of piezoelectric materials", Proc. SPIE 2715, Smart Structures and Materials 1996: Mathematics and Control in Smart Structures, (31 May 1996); doi: 10.1117/12.240848; https://doi.org/10.1117/12.240848
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