Electromechanical response of silicone dielectric elastomers

7th International Conference on Advanced Concepts in Mechanical Engineering

Cârlescu, V.^1 ; Priscaru, G.^1 ; Olaru, D.^1

Mechanical Engineering, Mechatronics and Robotics Department, Gheorghe Asachi Technical University of Iasi, Iasi, Romania^1

关键词: Dc electric field;    Dielectric elastomers;    Electromechanical property;    Electromechanical response;    Experimental techniques;    Non-contact measurement technique;    Quadratic dependence;    Thickness strain;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/147/1/012057/pdf
DOI  :  10.1088/1757-899X/147/1/012057

来源: IOP

【 摘 要 】

This paper presents an experimental technique to investigate the electromechanical properties of silicone dielectric elastomers actuated with high DC electric fields. A non-contact measurement technique is used to capture and monitor the thickness strain (contraction) of a circular film placed between two metallic disks electrodes. Two active fillers such as silica (10, 15 and 30 wt%) and barium titanate (5 and 15 wt%) were incorporated in order to increase the actuation performance. Thickness strain was measured at HV stimuli up to 4.5 kV and showed a quadratic dependence against applied electric field indicating that the induced strain is triggered by the Maxwell effect and/or electrostriction phenomenon as reported in literature. The actuation process evidences a rapid contraction upon HV activation and a slowly relaxation when the electrodes are short-circuit due to visco-elastic nature of elastomers. A maximum of 1.22 % thickness strain was obtained at low actuating field intensity (1.5 V/μm) comparable with those reported in literature for similar dielectric elastomer materials.