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We report the effect of electric field and of thin encapsulation layers on the lifetime of silicone-based dielectric elastomer actuators (DEAs), for different environmental conditions under DC actuation. The dielectric is Elastosil 2030/20, and the encapsulation layer is a soft silicone elastomer. We conduct our tests from 20°C to 85°C, and from 20% RH to 90% RH. increasing the electric field from 90 V/μm (3.5% actuation strain) to 110 V/μm (7% actuation strain) yields 140x lower lifetimes at 85°C – 85% RH. Encapsulating the DEAs increases DC lifetime of factors up to 30x, with negligible reduction in actuation strain.
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Fabio Beco Albuquerque, Herbert Shea, "Factors influencing the mean-time-to-failure of single-layer uniaxially prestretched silicone-based DEAs," Proc. SPIE 12042, Electroactive Polymer Actuators and Devices (EAPAD) XXIV, 1204206 (20 April 2022); https://doi.org/10.1117/12.2611165