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Analysis of viscoelastic soft dielectric elastomer generators operating in an electrical circuit

Bortot, Eliana; Denzer, Ralf LU ; Menzel, Andreas LU and Gei, Massimiliano (2016) In International Journal of Solids and Structures 78-79(1). p.205-215
Abstract
A predicting model for soft dielectric elastomer generators (DEGs) must consider a realistic model of the electromechanical behaviour of the elastomer filling, the variable capacitor and of the electrical circuit connecting all elements of the device. In this paper such an objective is achieved by proposing a framework for reliable simulations of soft energy harvesters. In particular, a simple electrical circuit is realised by connecting the capacitor, stretched periodically by a source of mechanical work, in parallel with a battery through a diode and with an electrical load consuming the energy produced. The electrical model comprises resistances simulating the effect of the electrodes and of the conductivity current invariably present... (More)
A predicting model for soft dielectric elastomer generators (DEGs) must consider a realistic model of the electromechanical behaviour of the elastomer filling, the variable capacitor and of the electrical circuit connecting all elements of the device. In this paper such an objective is achieved by proposing a framework for reliable simulations of soft energy harvesters. In particular, a simple electrical circuit is realised by connecting the capacitor, stretched periodically by a source of mechanical work, in parallel with a battery through a diode and with an electrical load consuming the energy produced. The electrical model comprises resistances simulating the effect of the electrodes and of the conductivity current invariably present through the dielectric film. As these devices undergo a high number of electro-mechanical loading cycles at large deformation, the time-dependent response of the material must be taken into account as it strongly affects the generator outcome. To this end, the viscoelastic behaviour of the polymer and the possible change of permittivity with strains are analysed carefully by means of a proposed coupled electro-viscoelastic constitutive model, calibrated on experimental data available in the literature for an incompressible polyacrylate elastomer (3M VHB4910). Numerical results showing the importance of time-dependent behaviour on the evaluation of performance of DEGs for different loading conditions, namely equi-biaxial and uniaxial, are reported in the final section. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
International Journal of Solids and Structures
volume
78-79
issue
1
pages
205 - 215
publisher
Elsevier
external identifiers
  • wos:000366883700020
  • scopus:84948408516
ISSN
0020-7683
DOI
10.1016/j.ijsolstr.2015.06.004
language
English
LU publication?
yes
id
ecd944fd-d6fc-4cd0-9fe5-3d461864e94b (old id 8258130)
date added to LUP
2015-12-07 14:19:23
date last changed
2017-11-05 04:08:23
@article{ecd944fd-d6fc-4cd0-9fe5-3d461864e94b,
  abstract     = {A predicting model for soft dielectric elastomer generators (DEGs) must consider a realistic model of the electromechanical behaviour of the elastomer filling, the variable capacitor and of the electrical circuit connecting all elements of the device. In this paper such an objective is achieved by proposing a framework for reliable simulations of soft energy harvesters. In particular, a simple electrical circuit is realised by connecting the capacitor, stretched periodically by a source of mechanical work, in parallel with a battery through a diode and with an electrical load consuming the energy produced. The electrical model comprises resistances simulating the effect of the electrodes and of the conductivity current invariably present through the dielectric film. As these devices undergo a high number of electro-mechanical loading cycles at large deformation, the time-dependent response of the material must be taken into account as it strongly affects the generator outcome. To this end, the viscoelastic behaviour of the polymer and the possible change of permittivity with strains are analysed carefully by means of a proposed coupled electro-viscoelastic constitutive model, calibrated on experimental data available in the literature for an incompressible polyacrylate elastomer (3M VHB4910). Numerical results showing the importance of time-dependent behaviour on the evaluation of performance of DEGs for different loading conditions, namely equi-biaxial and uniaxial, are reported in the final section.},
  author       = {Bortot, Eliana and Denzer, Ralf and Menzel, Andreas and Gei, Massimiliano},
  issn         = {0020-7683},
  language     = {eng},
  number       = {1},
  pages        = {205--215},
  publisher    = {Elsevier},
  series       = {International Journal of Solids and Structures},
  title        = {Analysis of viscoelastic soft dielectric elastomer generators operating in an electrical circuit},
  url          = {http://dx.doi.org/10.1016/j.ijsolstr.2015.06.004},
  volume       = {78-79},
  year         = {2016},
}