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31 March 2009 Effect of aspect ratio on the electroelastic properties of piezoelectric nanocomposites
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Piezoelectric materials offer exceptional sensing and actuation properties however are prone to breakage and difficult to apply to curved surfaces in their monolithic form. One method of alleviating these issues is through the use of 0-3 nanocomposites, which are formed by embedding piezoelectric particles into a polymer matrix. This class of material offers certain advantages over monolithic materials, however has seen little use due to its low coupling. Here we develop a micromechanics and finite element models to study the electroelastic properties of an active nanocomposite as a function of the aspect ratio and alignment of the piezoelectric inclusions. Our results show the aspect ratio is critical to achieving high electromechanical coupling and with an increase from 1 to 10 at 30% volume fraction of piezoelectric filler the coupling can increase by 60 times and achieve a bulk composite coupling as high as 90% of a pure PZT-7A piezoelectric constituent.
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Clark Andrews, Yirong Lin, and Henry A. Sodano "Effect of aspect ratio on the electroelastic properties of piezoelectric nanocomposites", Proc. SPIE 7289, Behavior and Mechanics of Multifunctional Materials and Composites 2009, 72891C (31 March 2009);

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