Modeling electromechanical properties of layered electrets: Application of the finite-element method

Details Modeling electromechanical properties of layered electrets: Application of the finite-element method Modeling electromechanical properties of layered electrets: Application of the finite-element method

2004-06-18

arxiv.org/abs/cond-mat/0406429v1

Journal of Electrostatics, Vol. 63, Issue 1, January 2005, Pages 21-35

Physics

Condensed Matter

Materials Science

To be appaer in J Electrostatics

Scientific paper

10.1016/j.elstat.2004.06.002

We present calculations on the deformation of two- and three-layer electret systems. The electrical field is coupled with the stress-strain equations by means of the Maxwell stress tensor. In the simulations, two-phase systems are considered, and intrinsic relative dielectric permittivity and Young's modulus of the phases are altered. The numerically calculated electro-mechanical activity is compared to an analytical expression. Simulations are performed on two- and three-layer systems. Various parameters in the model are systematically varied and their influence on the resulting piezoelectricity is estimated. In three-layer systems with bipolar charge, the piezoelectric coefficients exhibit a strong dependence on the elastic moduli of the phases. However, with mono-polar charge, there is no significant piezoelectric effect. A two-dimensional simulation illustrated that higher piezoelectricity coefficients can be obtained for non-uniform surface charges and low Poisson's ratio of phases. Irregular structures considered exhibit low piezoelectric activity compared to two-layer structures.

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