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Dynamic pull-in instability of a prestretched viscous dielectric elastomer under electric loading

Eder-Goy, Dagmar and Zhao, Ying and Xu, Bai-Xiang (2017):
Dynamic pull-in instability of a prestretched viscous dielectric elastomer under electric loading.
In: Acta Mechanica, Springer, pp. 1-15, ISSN 0001-5970,
DOI: 10.1007/s00707-017-1930-4,
[Article]

Abstract

The dynamic response of a pre-stretched elastomer membrane under electric loading was analysed. Thereby, two cases of voltage application, constant voltage and an incrementally increased voltage were regarded. The equation of motion (EOM) was derived from the Euler-Lagrange equation and the Rayleigh dissipation function. This allowed to include the influence of prestretch into the evolution equation of the viscous stretch. The critical values of pull-in instability under dynamic assumptions were determined at the initial state by an analytical model derived from the classical approaches of stability theory regarding geometric instabilities by using an energy criterion and were used to validate the numerical solution of the EOM. The results showed that both inertia and viscous effects have a notable influence on the pull-in stability behavior. In particular, at applied electric fields below the critical electric field the viscous behavior can still induce failure, which occurs time delayed. A non-monotonic dependence of the failure stretch on the magnitude of the applied electric fields below the critical value could be observed.

Item Type: Article
Erschienen: 2017
Creators: Eder-Goy, Dagmar and Zhao, Ying and Xu, Bai-Xiang
Title: Dynamic pull-in instability of a prestretched viscous dielectric elastomer under electric loading
Language: English
Abstract:

The dynamic response of a pre-stretched elastomer membrane under electric loading was analysed. Thereby, two cases of voltage application, constant voltage and an incrementally increased voltage were regarded. The equation of motion (EOM) was derived from the Euler-Lagrange equation and the Rayleigh dissipation function. This allowed to include the influence of prestretch into the evolution equation of the viscous stretch. The critical values of pull-in instability under dynamic assumptions were determined at the initial state by an analytical model derived from the classical approaches of stability theory regarding geometric instabilities by using an energy criterion and were used to validate the numerical solution of the EOM. The results showed that both inertia and viscous effects have a notable influence on the pull-in stability behavior. In particular, at applied electric fields below the critical electric field the viscous behavior can still induce failure, which occurs time delayed. A non-monotonic dependence of the failure stretch on the magnitude of the applied electric fields below the critical value could be observed.

Journal or Publication Title: Acta Mechanica
Publisher: Springer
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Mechanics of functional Materials
11 Department of Materials and Earth Sciences
Date Deposited: 07 Jul 2017 08:47
DOI: 10.1007/s00707-017-1930-4
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