Nonequilibrium thermodynamics of dielectric elastomers

Published

Journal Article

This paper describes an approach to construct models of dielectric elastomers undergoing dissipative processes, such as viscoelastic, dielectric and conductive relaxation. This approach is guided by nonequilibrium thermodynamics, characterizing the state of a dielectric elastomer with kinematic variables through which external loads do work, as well as internal variables that describe the dissipative processes. Within this approach, a method is developed to calculate the critical condition for electromechanical instability. This approach is illustrated with a specific model of a viscoelastic dielectric elastomer, which is fitted to stress-strain curves of a dielectric elastomer (VHB tape), measured at various strain rates. The model shows that a higher critical voltage can be achieved by applying a constant voltage for a shorter time, or by applying ramping voltage with a higher rate. A viscoelastic dielectric elastomer can attain a larger strain of actuation than an elastic dielectric elastomer. © 2011 Imperial College Press.

Full Text

Cited Authors

  • Zhao, X; Koh, SJA; Suo, Z

Published Date

  • June 1, 2011

Published In

Volume / Issue

  • 3 / 2

Start / End Page

  • 203 - 217

Electronic International Standard Serial Number (EISSN)

  • 1758-826X

International Standard Serial Number (ISSN)

  • 1758-8251

Digital Object Identifier (DOI)

  • 10.1142/S1758825111000944

Citation Source

  • Scopus