Computational Analysis of Piezoelectric Systems Using A Coupled Multiphysics Finite Element Model
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Date
2017-08-09
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Johns Hopkins University
Abstract
A multiphysics nite element model framework for coupling transient electromagnetic
and dynamic mechanical elds is utilized to perform computational analysis
of piezoelectric material systems. The model framework achieves coupling between
the mechanical and electromagnetic elds by solving the corresponding governing
equations in the time domain, and is capable of predicting the evolution of electric
eld variables in a conducting medium undergoing dynamic nite deformation. The
computational model is then calibrated to reproduce experimentally-characterized behavior
of viscoelastic piezo-nanocomposite (p-NC) structures subjected to dynamic
loading. The numerical model shows good agreement with experimental results on
the loading-frequency dependent piezoelectric output of p-NC systems. Sensitivity
study is conducted with the calibrated model to examine the e ect of the mechanical
input parameters on piezoelectric output of p-NC. Based on the ndings, the energy
harvesting and sensing performance of p-NC systems can be enhanced by e ectively
harnessing the viscoelastic properties of the material.
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Keywords
piezoelectricity, viscoelasticity, finite element analysis