The dielectric breakdown limit of silicone dielectric elastomer actuators

被引：89
|
作者：
Gatti, Davide [1 ,2 ]
Haus, Henry [2 ]
Matysek, Marc [2 ]
Frohnapfel, Bettina [3 ]
Tropea, Cameron [1 ]
Schlaak, Helmut F. [2 ]
机构：
[1] Tech Univ Darmstadt, Ctr Smart Interfaces, D-64287 Darmstadt, Germany
[2] Tech Univ Darmstadt, Inst Electromech Design, D-64287 Darmstadt, Germany
[3] Karlsruhe Inst Technol, Inst Fluid Mech, D-76131 Karlsruhe, Germany
来源：
APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 05期
关键词：
THICKNESS; STRENGTH; FILMS; DEPENDENCE; RUBBER; STRAIN;
D O I：
10.1063/1.4863816
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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 (TM) 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. (C) 2014 AIP Publishing LLC.
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页数：4
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