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Proceedings Paper

The electrical breakdown of thin dielectric elastomers: thermal effects
Author(s): Shamsul Zakaria; Peter H. F. Morshuis; Mohamed Yahia Benslimane; Krist V. Gernaey; Anne Ladegaard Skov
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Paper Abstract

Dielectric elastomers are being developed for use in actuators, sensors and generators to be used in various applications, such as artificial eye lids, pressure sensors and human motion energy generators. In order to obtain maximum efficiency, the devices are operated at high electrical fields. This increases the likelihood for electrical breakdown significantly. Hence, for many applications the performance of the dielectric elastomers is limited by this risk of failure, which is triggered by several factors. Amongst others thermal effects may strongly influence the electrical breakdown strength. In this study, we model the electrothermal breakdown in thin PDMS based dielectric elastomers in order to evaluate the thermal mechanisms behind the electrical failures. The objective is to predict the operation range of PDMS based dielectric elastomers with respect to the temperature at given electric field. We performed numerical analysis with a quasi-steady state approximation to predict thermal runaway of dielectric elastomer films. We also studied experimentally the effect of temperature on dielectric properties of different PDMS dielectric elastomers. Different films with different percentages of silica and permittivity enhancing filler were selected for the measurements. From the modeling based on the fitting of experimental data, it is found that the electrothermal breakdown of the materials is strongly influenced by the increase in both dielectric permittivity and conductivity.

Paper Details

Date Published: 8 March 2014
PDF: 11 pages
Proc. SPIE 9056, Electroactive Polymer Actuators and Devices (EAPAD) 2014, 90562V (8 March 2014); doi: 10.1117/12.2037292
Show Author Affiliations
Shamsul Zakaria, Technical Univ. of Denmark (Denmark)
Peter H. F. Morshuis, Technische Univ. Delft (Netherlands)
Mohamed Yahia Benslimane, Danfoss Polypower A/S (Denmark)
Krist V. Gernaey, Technical Univ. of Denmark (Denmark)
Anne Ladegaard Skov, Technical Univ. of Denmark (Denmark)

Published in SPIE Proceedings Vol. 9056:
Electroactive Polymer Actuators and Devices (EAPAD) 2014
Yoseph Bar-Cohen, Editor(s)

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