Dielectric-Elastomer Actuators Built with Photopolymer Materials: Electrode Integration, Breakdown and Cycle Life

Dielectric-elastomer actuation converts an applied electric field into Maxwell stress, thickness contraction and in-plane expansion, but the useful stroke is bounded by electrical breakdown, electromechanical instability, viscoelastic loss and electrode damage. In photopolymer-built actuators, cure state, thickness nonuniformity and printed interfaces add spatial variations that can localize electric field and strain. Qualification therefore requires simultaneous voltage, current and deformation measurements rather than a displacement-only demonstration. Thickness mapping, dielectric strength under the relevant prestrain, electrode sheet resistance during cycling and temperature tracking define whether the actuator operates inside a stable electromechanical window. The resulting evidence supports three engineering decisions: a maximum working field, an allowable prestrain and electrode architecture, and a cycle-life limit tied to measurable drift rather than catastrophic failure alone. ER-371.