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Assessing the degradation of compliant electrodes for soft actuators

We present an automated system to measure the degradation of compliant electrodes used in dielectric elastomer actuators (DEAs) over millions of cycles. Electrodes for DEAs generally experience biaxial linear strains of more than 10%. The decrease in electrode conductivity induced by this repeated f... Full description

Contained in: Review of Scientific Instruments Vol. 88, No. 10 (2017), p. 105002/1-10
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Links: Additional Link (dx.doi.org)
Additional Keywords: AUTOMATISIERUNGSTECHNIK
DIELEKTRISCHER-STOFF
ELASTOMER
ELEKTRODE
ERDUNGSELEKTRODE
HOCHSPANNUNG
HOMOGENITAET
MESSVERFAHREN
MULTIMETER
RUSSSCHWARZ
SILICON:POLYMER
VERBUNDWERKSTOFF
VERSORGUNG
DOI: 10.1063/1.4989464
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 10 Seiten, 37 Quellen
ID (e.g. DOI, URN): 10.1063/1.4989464
PPN (Catalogue-ID): WTI059383674
Note: WTI TEMA DB
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520 |a We present an automated system to measure the degradation of compliant electrodes used in dielectric elastomer actuators (DEAs) over millions of cycles. Electrodes for DEAs generally experience biaxial linear strains of more than 10%. The decrease in electrode conductivity induced by this repeated fast mechanical deformation impacts the bandwidth of the actuator and its strain homogeneity. Changes in the electrode mechanical properties lead to reduced actuation strain. Rather than using an external actuator to periodically deform the electrodes, our measurement method consists of measuring the properties of an electrode in an expanding circle DEA. A programmable high voltage power supply drives the actuator with a square signal up to 1 kHz, periodically actuating the DEA, and thus stretching the electrodes. The DEA strain is monitored with a universal serial bus camera, while the resistance of the ground electrode is measured with a multimeter. The system can be used for any type of electrode. We validated the test setup by characterising a carbon black/silicone composite that we commonly use as compliant electrode. Although the composite is well-suited for tens of millions of cycles of actuation below 5%, we observe important degradation for higher deformations. When activated at a 20% radial strain, the electrodes suffer from important damage after a few thousand cycles, and an inhomogeneous actuation is observed, with the strain localised in a sub-region of the actuator only. 
653 4 |a VERBUNDWERKSTOFF 
653 4 |a VERSORGUNG 
653 4 |a ERDUNGSELEKTRODE 
653 4 |a MULTIMETER 
653 4 |a ELASTOMER 
653 4 |a HOMOGENITAET 
653 4 |a RUSSSCHWARZ 
653 4 |a SILICON:POLYMER 
653 4 |a DIELEKTRISCHER-STOFF 
653 4 |a MESSVERFAHREN 
653 4 |a AUTOMATISIERUNGSTECHNIK 
653 4 |a HOCHSPANNUNG 
653 4 |a ELEKTRODE 
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950 |a Komposit  |a Versorgung  |a Erdungselektrode  |a Multimeter  |a Elastomer  |a Homogenität  |a Rußschwarz  |a Silikon (Polymer)  |a Dielektrikum  |a Messmethode  |a Automatisierungssystem  |a Hochspannung  |a Elektrode  |2 DE-601 
950 |a dielektrischer Elastomer-Aktor  |a Radialspannung  |2 DE-601 
951 |a AR 
952 |d 88  |j 2017  |e 10  |h 105002/1-10