New composite materials and devices are been investigated by researchers in the fields of energy harvesting, structural health monitoring (SHM) of civil and mechanical structures and acoustic attenuation. The criteria that govern the applicability of these types of devices are their sensitivity and durability, which depend on electromechanical properties such as the dielectric constant, piezoelectric strain coefficient, and the dielectric loss. The present work investigates the role of Aluminum and PZT inclusions distributed in an epoxy matrix to fabricate composites with high dielectric and strain coefficients. The influence of Aluminum inclusion size (nano and micron) and (lead zirconate titanate) PZT and Aluminum volume fraction on the electromechanical properties of the three phase PZT-epoxy-aluminum composites were experimentally investigated. An analytical expression for the prediction of the effective dielectric constant of a three phase 0-3-0 piezoelectric composite has also been developed. The analytical results are verified with the experimental results from Nan et al. The analytical model is also extended to include the shape of a conductive inclusion phase; to examine the influence of the shape on the effective dielectric constant of the composite. The electromechanical properties of the composites are influenced by several factors: inclusion agglomeration, contact resistance between particles, and air voids. The present work studies the influence of these factors on the effective electromechanical properties of the composite.
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Mechanical and Aerospace Engineering
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Rutgers University Electronic Theses and Dissertations
Rutgers University. Graduate School - New Brunswick
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