Wound Roll Dielectric Elastomer Actuators: Fabrication, Analysis, and Experiments

• Published in: IEEE/ASME transactions on mechatronics Vol. 13; no. 1; pp. 117 - 124
• Main Authors: Rajamani, A., Grissom, M.D., Rahn, C.D., Qiming Zhang
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-02-2008; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Actuators; Bandwidth; Capacitive sensors; Compressive stress; Dielectric devices; Dielectric materials; Electroactive polymers; Fabrication; finite elements; Polymers; Predictive models; stress analysis; Wounds
• ISSN: 1083-4435; 1941-014X
• DOI: 10.1109/TMECH.2008.915825

Wound roll electroactive polymer actuators fabricated with dielectric elastomer (DE) materials provide high bandwidth actuation for robots, minipumps, loudspeakers, valves, and prosthetic devices. In this paper, we develop a DE wound roll actuator fabrication process that produces high strain (12%), reliable (3480 cycles at maximum strain), and stiff (144 N/m) actuators. An axisymmetric Unite element model with electrostatic and radial bulk modulus nonlinearity predicts actuator displacement and stress. The maximum compressive radial stress occurs at the center of the innermost active layer. This layer also has the thinnest material, indicating the most likely failure point. The nonlinear model predicts actuator displacement in response to applied voltage and load, matching experiments to within 1 mm.