Dielectric Electroactive Polymers at Breakdown Voltage State and Reversibility
Date Issued
2011
Date
2011
Author(s)
Chang, Chih-Kuo
Abstract
Recently, there has been growing interest in actuators by using dielectric electroactive polymers, DEAPs due to their attractive properties of mechanism, low cost and high dielectric constant. However, operating characteristics of DEAPs are affected by applied voltage and the size of DEAPs. With increases applied voltage, because of increasing electric force, compliant electrodes of actuator are gradually close to each other. If the thickness of DEAPs decreases, applied voltage can be lower and reliability can be improved. The researches of reliability are important issues today. In our experiments, we focus on and discuss breakdown phenomenon, pull-in effect and reversibility of DEAPs material. In the experiment, we apply a DC voltage to DEA actuator and observe the alterations of displacement and current with time and the increase of applied voltage. In our results, it was found that the largest current is observed by computer when applied voltage is 2000V. This result signifies that breakdown phenomenon occurs at this time. According to discriminant of condition, breakdown phenomenon occurs before pull-in effect occurs. Meanwhile, with the increase of applied voltage from 0V to 1600V and then, decreases to 0V, we observe the reversibility of DEA material and also discuss its hysteresis. In addition, the mechanical-electrical coupling model for DEAPs is also successfully investigated by electrostatic analysis and hyper-elastic stress analysis.
Subjects
dielectric electroactive polymers
DEAPs
pull-in effect
hyper-elastic
breakdown phenomenon
reversibility
modeling
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