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Very high dielectric strength for dielectric elastomer actuators in liquid dielectric immersion
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10.1063/1.4806976
/content/aip/journal/apl/102/19/10.1063/1.4806976
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/19/10.1063/1.4806976

Figures

Image of FIG. 1.
FIG. 1.

A schematic (sectional view) showing the experimental setup, which has a DEA sample completely immersed in a silicone oil bath while the DEA is activated by high voltage.

Image of FIG. 2.
FIG. 2.

Electromechanical activation of DEAs in either the air or the oil immersion: (a) Photographs showing electrode expansion for a DEA when tested in air. Wrinkles and sparks at spot were observed on dielectric film when the DEA breaks down at 11 kV (or 450 MV/m). (b) Photographs showing electrode expansion for a DEA when tested in the silicone oil immersion. Wrinkles appear changing from mild to severely undulated and sagging as the driving voltage increases from 11 kV to 18 kV, but the oil immersed DEA did not break down. (c) A graph showing areal strain of the activated DEAs as a function of electric field until breakdown.

Image of FIG. 3.
FIG. 3.

Thermography of the activated DEAs: (a) two thermograms of a DEA sample in air at 10 kV and 11 kV, respectively. The right thermogram showed that a hot spot occurred at the puncture when the DEA in air breaks down at 11 kV. (b) two thermograms of silicone oil bath, which immerses a DEA sample that is activated at 18 kV and 19 kV, respectively. Right thermogram showed that a distorted hot spot happens on the oil surface and it indicates oil circulation and Joule' heating at the puncture of DEA, which breaks down at 19 kV.

Image of FIG. 4.
FIG. 4.

Monitor of temperature and leakage current for DEA samples, which were activated by increasing voltages in air or oil immersion, respectively. (a) A graph showing temperature as a function of driving voltage at the punctured region of DEA sample. (b) Time histories of leakage current as the driving voltage is ramped up across the DEA. Leakage current surges when DEA breaks down. (c) Time histories of the driving voltage, which was increased incrementally until the breakdown of DEA. The voltage dips to low beyond the control when DEA breaks down in air at 11 kV.

Image of FIG. 5.
FIG. 5.

(a) Temperature dependence of volume (or bulk) resistivity of a 200% biaxially pre-strained VHB 4905 film (with a 55 m pre-stretched thickness). (b) Surface resistance of graphite powder electrodes as a function of uniaxial stretch ratio.

Tables

Generic image for table
Table I.

Breakdown strength of VHB films or DEAs.

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/content/aip/journal/apl/102/19/10.1063/1.4806976
2013-05-14
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Very high dielectric strength for dielectric elastomer actuators in liquid dielectric immersion
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/19/10.1063/1.4806976
10.1063/1.4806976
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