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Large actuation and high dielectric strength in metallized dielectric elastomer actuators
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View: Figures


Image of FIG. 1.
FIG. 1.

Electro-mechanical activation of bi-axially pre-stretched membrane DEAs: (a) photographs showing the top view of an ELD silver electrode for the DEA before and during activation. A 50% area strain is obtained during the activation at 9 kV. (b) A graph showing the actuated area strain as a function of driving voltage for the DEAs using various electrode materials. Five samples of DEAs using ELD silver electrodes were tested, and error bars indicate the standard deviation.

Image of FIG. 2.
FIG. 2.

Self-healing demonstrated in a DEA with ELD silver electrodes: (a) time histories of voltage and current show that the first self-healing occurs at 5 kV, as indicated by a recovery following a plunge in voltage together with a corresponding spike in current. (b) A self-heal site wherein passivation of the puncture site circumvents a terminal electrical-shorting.

Image of FIG. 3.
FIG. 3.

(a) Change in resistance of an ELD silver electrode, a graphite electrode, and a sputtered silver electrode under uni-axial strain, up to the loss of conductivity; (b) micrographs showing the formation and then widening of micro-cracks in an ELD silver film under uni-axial strains at 0%, 10%, and 20%; and (c) change in resistance of an ELD silver electrode under cyclic loading and unloading of uni-axial strains between 0% and 20%.

Image of FIG. 4.
FIG. 4.

Stress-strain curves for VHB 4905 samples with coating of three electrode materials under unaxial stretching. The calculated Young’s modulus for each sample was obtained by using a least-square fitting of measured stress and strain to the Mooney-Rivlin model.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Large actuation and high dielectric strength in metallized dielectric elastomer actuators