Multi-Layers Planar Dielectric Elastomer Actuator Toward Reducing Control Voltage in In-Plane Actuation Applications

Abstract

Dielectric elastomer actuators (DEAs) belong to an emerging soft actuation technology that have advantages in large actuation strain. However, the existing single-layer planar DE actuators commonly need fairly high voltage to achieve good in-plane actuation capability. A multi-layers planar dielectric elastomer actuator (MPDEA) is proposed in this work to realize effective in-plane actuation under low voltage. To facilitate the studies on the effects of multi-layers planar configuration of actuator on control voltage, a base flexible thin-walled beam equipped with a MPDEA is investigated. The electromechanically coupling finite element model of composite beam structure is first established. The theoretical model of actuating force of MPDEA is obtained. The numerical and experimental studies on the in-plane actuation capabilities of MPDEAs with different layer number are then carried out through evaluating the electro-driven deformation of base flexible thin-walled beam. The results demonstrate that increasing the number of layers can improve significantly the in-plane driving capability of MPDEA. As a result, a four-layers MPDEA can reduce control voltage by 53.62% compared with a single-layer planar DEA to generate the same deformation at the tip of beam.