Abstract
Cellular piezoelectret film is actually the voided charged polymer foam that, macroscopically, shows significant quasi-piezoelectricity in the thickness direction. In this study, cellular piezoelectret film is viewed as a periodic composite, where the charged microvoids are taken as piezoelectric inclusions scattered periodically in the host polymer matrix. Based on the asymptotic homogenization for piezoelectric composite implemented by finite element method, the effective electromechanical properties of cellular piezoelectret film are numerically modeled. Dependence of the overall electromechanical properties on various material parameters and geometric variables of voids is explored. The inflation experiments of cellular piezoelectret film published in the literature can also be numerically simulated. It is shown that the overall properties of cellular piezoelectret film can be effectively simulated by the asymptotic homogenization based on finite element analysis. This approach can be an efficient mean for the numerical simulation of the overall properties in the optimization design of cellular piezoelectret film with complex microvoid structures.
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