A polarisation based approach to model the strain dependent permittivity of dielectric elastomers

Journal article
(Review article)


Publication Details

Author(s): Schlögl T, Leyendecker S
Journal: Sensors and Actuators A-Physical
Publication year: 2017
Volume: 267
Pages range: 156-163
ISSN: 0924-4247


Abstract

A wide-spread lumped parameter model describing the electrostatic pressure present in dielectric elastomer actuators is presented by Pelrine et al. in 1998. In Pelrine's model, the electrostatic pressure is affected by the relative permittivity of the material, also known as dielectric constant. However, many researchers found that the dielectric constant of dielectric elastomers is not constant at all, but decreasing with increasing pre-stretch of the material. This holds especially for acrylic materials such as VHB 4910 from 3M. From a physical point of view, polarisation within the dielectric material is responsible for the material's permittivity and in general, polarisation is deformation dependent. In this work, an alternative modelling approach is presented, explaining the stretch dependent electrostatic pressure. It is shown that Pelrine implicitly assumes that the polarisation of the material is linear in the imposed electric field strength. If this assumption is modified to allow for a more general polarisation field that is based on invariants of the electromechanically coupled problem, a new polarisation based lumped parameter model is obtained. It is shown that this new model fits experimental data found in literature quite well.


FAU Authors / FAU Editors

Leyendecker, Sigrid Prof. Dr.-Ing.
Chair of Applied Dynamics
Schlögl, Tristan
Chair of Applied Dynamics


How to cite

APA:
Schlögl, T., & Leyendecker, S. (2017). A polarisation based approach to model the strain dependent permittivity of dielectric elastomers. Sensors and Actuators A-Physical, 267, 156-163. https://dx.doi.org/10.1016/j.sna.2017.09.048

MLA:
Schlögl, Tristan, and Sigrid Leyendecker. "A polarisation based approach to model the strain dependent permittivity of dielectric elastomers." Sensors and Actuators A-Physical 267 (2017): 156-163.

BibTeX: 

Last updated on 2018-18-10 at 04:40