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The dielectric breakdown limit of silicone dielectric elastomer actuators

Gatti, Davide and Haus, Henry and Matysek, Marc and Frohnapfel, Bettina and Tropea, Cameron and Schlaak, Helmut F. (2014):
The dielectric breakdown limit of silicone dielectric elastomer actuators.
In: Applied Physics Letters, AIP Publishing LLC, 104, (5), ISSN 0003-6951, [Online-Edition: http://dx.doi.org/10.1063/1.4863816],
[Article]

Abstract

Soft silicone elastomers are used in a generation of dielectric elastomer actuators (DEAs) with improved actuation speed and durability compared to the commonly used, highly viscoelastic polyacrylate 3M VHB films. The maximum voltage-induced stretch of DEAs is ultimately limited by their dielectric breakdown field strength. We measure the dependence of dielectric breakdown field strength on thickness and stretch for a silicone elastomer, when voltage-induced deformation is prevented. The experimental results are combined with an analytic model of equi-biaxial actuation to show that accounting for variable dielectric field strength results in different values of optimal pre-stretch and thickness that maximize the DEA actuation.

Item Type: Article
Erschienen: 2014
Creators: Gatti, Davide and Haus, Henry and Matysek, Marc and Frohnapfel, Bettina and Tropea, Cameron and Schlaak, Helmut F.
Title: The dielectric breakdown limit of silicone dielectric elastomer actuators
Language: German
Abstract:

Soft silicone elastomers are used in a generation of dielectric elastomer actuators (DEAs) with improved actuation speed and durability compared to the commonly used, highly viscoelastic polyacrylate 3M VHB films. The maximum voltage-induced stretch of DEAs is ultimately limited by their dielectric breakdown field strength. We measure the dependence of dielectric breakdown field strength on thickness and stretch for a silicone elastomer, when voltage-induced deformation is prevented. The experimental results are combined with an analytic model of equi-biaxial actuation to show that accounting for variable dielectric field strength results in different values of optimal pre-stretch and thickness that maximize the DEA actuation.

Journal or Publication Title: Applied Physics Letters
Volume: 104
Number: 5
Publisher: AIP Publishing LLC
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Fluid Mechanics and Aerodynamics (SLA)
18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design
Exzellenzinitiative
Exzellenzinitiative > Clusters of Excellence
Zentrale Einrichtungen
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
Date Deposited: 27 Jul 2015 11:52
Official URL: http://dx.doi.org/10.1063/1.4863816
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