Impact of the Synthesis Procedure of Diaphragm-Shaped Dielectric Elastomers on the Performance as Novel Miniature Actuators

Abstract

Dielectric elastomer actuators (DEAs) form a contemporary solution to miniature actuation. The purpose of this research paper is to analyse the effect of electrode application and geometry on the performance of diaphragm-type DEAs. The DEA is intended for use as a robust, low-cost small-scale actuator to be integrated into a tactile braille display. The device is intended to be mounted on the reader’s index finger and transcribe scanned text to braille. This paper explores the use of inflated DEAs as a solution to reduce the thickness of the mechanical actuators to mimic the proprioceptive response of reading a traditional braille embossed page of text. The elastomer and electrode layers which comprise the DEA were selected according to the relatively low cost, accessibility, and ability to be applied by hand. Experiments were conducted to compare the method and direction of carbon grease application on the pre-strained elastomer layer. A stipple-based application method was identified as producing both the most stable results and the largest vertical deflection of 1,6mm. This research aims to assist in the development of actuators with greater portability and scope for miniaturisation than commercially available pneumatic or piezoelectric alternatives.