Effects of orientation on electro-mechanical coupling behavior of ferroelectrics and their composites
Item
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Title
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Effects of orientation on electro-mechanical coupling behavior of ferroelectrics and their composites
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Identifier
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d_2009_2013:58caef7cc010:10258
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identifier
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10473
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Creator
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Zhao, Ping,
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Contributor
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Jackie Li
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Date
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2009
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Language
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English
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Publisher
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City University of New York.
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Subject
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Mechanical engineering
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Abstract
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The aim of this dissertation is to systematically study the nonlinear electro-mechanical coupling behavior of ferroelectrics and their composites under multi-axial loadings. Both experimental investigation and theoretical modeling are carried out.;For experiments, piezoelectric ceramics and 1-3 piezoelectric composites are tested under mechanical compressive loading and electric field, respectively. When a mechanical or electric loading is applied to piezoelectrics or piezoelectric composites at an angle theta to the original poling direction, its nonlinear electromechanical response is dependent on such an angle. As the loading direction changes from 0° to 90° to the initial poling direction, the experimental results exhibit strong angle dependence and nonlinear behavior under compression and electric field.;For theoretical modeling, a micromechanics approach developed by Li & Weng [1, 2] is adopted and extended to study the orientation effects on the electromechanical coupling behavior of ferroelectrics. A two-level theory developed by Lu and Weng [3], which originally targeted to shape memory alloy systems, is modified to study the nonlinear coupling behavior of piezoelectric composites. The results from both experimental data and modeling are compared and discussed.
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Type
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dissertation
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Source
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2009_2013.csv
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degree
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Ph.D.
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Program
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Engineering
