Dynamic Modeling of Dielectric Elastomer Actuators

Dielectric Elastomer Actuators (DEAs) are smart materials that have the capability of producing large strains with the application of an electric field.  They consist of an elastic polymer coated on each side with a compliant electrode.  When a voltage is applied, the opposing charges of the electrodes attract one another, causing contraction of the polymer in the thickness direction and expansion in the radial direction.  The current project uses a DEA membrane as a pumping mechanism.  The membrane is mounted on a chamber and a bias pressure is developed inside.  When an electric field is applied, the membrane inflates slightly, causing a change in volume.  A voltage applied cyclically will then produce a pumping action.  It is desired to dynamically test and model such a pump to help in the design of devices incorporating such an actuator.

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