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  4. Influence of the active-to-passive area ratio on the electrically induced strain of a fiber-reinforced dielectric elastomer actuator
 
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2023
Conference Paper
Title

Influence of the active-to-passive area ratio on the electrically induced strain of a fiber-reinforced dielectric elastomer actuator

Abstract
There is an increasing interest to use novel elastomers with inherent or modified advanced dielectric and mechanical properties, as components of dielectric elastomer actuators (DEA). This requires corresponding techniques to assess their electromechanical performance. One performance criterion is the electrically induced deformation of the active electrode area. In this work, a rectangular DEA is used to investigate the influence of the ratio between the active electrode and the passive area on the actuator deformation. For this purpose, a dielectric silicone film is bonded on one surface to a unidirectional carbon fiber fabric. Thereby, highly anisotropic mechanical properties are implemented. When strains are applied perpendicular to the fiber direction, the composite hardly contracts in the fiber direction due to the superior stiffness of the fibers. In addition, the conductive fiber structure also acts as a highly anisotropic compliant electrode. By application of a second paste-like electrode onto the silicone film a DEA is created that operates in a pure shear configuration. This assembly enables the modification of the active-to-passive area ratio and the investigation of its effect on the actuator deformation. Image-based measurements are used to determine the strain of the active electrode area. The experimental results are compared to a lumped-parameter model that considers the electromechanical properties of the fiber-reinforced DEA. In summary, the ratio of the active-to-passive area has a significant influence on the measured deformation. Especially for novel actuator materials that do not exhibit large strains, an active-to-passive ratio of 50 % proves to be particularly advantageous.
Author(s)
Liebscher, Hans
TU Dresden  
Endesfelder, Anett
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Koenigsdorff, Markus
TU Dresden  
Mersch, Johannes
TU Dresden  
Zimmermann, Martina  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Gerlach, Gerald
Mainwork
Electroactive Polymer Actuators and Devices (EAPAD) XXV  
Conference
Conference "Electroactive Polymer Actuators and Devices" 2023  
DOI
10.1117/12.2656662
Language
English
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Keyword(s)
  • active-to-passive area ratio

  • anistropy

  • dielectric elastomer actuator

  • electromechanical transducer

  • equivalent circuit

  • fiber-elastomer composite

  • lumped-parameter model

  • unindirectional actuator

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