Electro-Thermal Model of Thermal Breakdown in Multilayered Dielectric Elastomers

Line Riis Christensen, Ole Hassager, Anne Ladegaard Skov*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Energy transduction of dielectric elastomers involves minute electrical and mechanical losses, both of which potentially increase the temperature within the elastomer. Thermal breakdown of dielectric elastomers occur when heat generated therein cannot be balanced by heat loss on the surface, which is more likely to occur in stacked dielectric elastomers. In this paper an electro-thermal model of a multilayered dielectric elastomer able to predict the possible number of layers in a stack before thermal breakdown occurs is presented. Simulation results show that point of breakdown is greatly affected by an increase in surrounding temperature and applied electric field. Furthermore, if the stack diameter is large, thermal insulation of the cylindrical surface is a valid approximation. Two different expressions for the electrical conductivity are used, and it is concluded that the Frank-Kamenetskii expression is more conservative in prediction of point of breakdown than the Arrhenius expression, except at high surrounding temperature. This article is protected by copyright. All rights reserved.
Original languageEnglish
JournalAIChE Journal
Volume65
Issue number2
Pages (from-to)859-864
Number of pages6
ISSN0001-1541
DOIs
Publication statusPublished - 2019

Keywords

  • Dielectric elastomer
  • Thermal breakdown
  • Electro-thermal model
  • Electrical conductivity
  • Multilayered

Cite this

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title = "Electro-Thermal Model of Thermal Breakdown in Multilayered Dielectric Elastomers",
abstract = "Energy transduction of dielectric elastomers involves minute electrical and mechanical losses, both of which potentially increase the temperature within the elastomer. Thermal breakdown of dielectric elastomers occur when heat generated therein cannot be balanced by heat loss on the surface, which is more likely to occur in stacked dielectric elastomers. In this paper an electro-thermal model of a multilayered dielectric elastomer able to predict the possible number of layers in a stack before thermal breakdown occurs is presented. Simulation results show that point of breakdown is greatly affected by an increase in surrounding temperature and applied electric field. Furthermore, if the stack diameter is large, thermal insulation of the cylindrical surface is a valid approximation. Two different expressions for the electrical conductivity are used, and it is concluded that the Frank-Kamenetskii expression is more conservative in prediction of point of breakdown than the Arrhenius expression, except at high surrounding temperature. This article is protected by copyright. All rights reserved.",
keywords = "Dielectric elastomer, Thermal breakdown, Electro-thermal model, Electrical conductivity, Multilayered",
author = "Christensen, {Line Riis} and Ole Hassager and Skov, {Anne Ladegaard}",
year = "2019",
doi = "10.1002/aic.16478",
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journal = "A I Ch E Journal",
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Electro-Thermal Model of Thermal Breakdown in Multilayered Dielectric Elastomers. / Christensen, Line Riis; Hassager, Ole; Skov, Anne Ladegaard.

In: AIChE Journal, Vol. 65, No. 2, 2019, p. 859-864.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Electro-Thermal Model of Thermal Breakdown in Multilayered Dielectric Elastomers

AU - Christensen, Line Riis

AU - Hassager, Ole

AU - Skov, Anne Ladegaard

PY - 2019

Y1 - 2019

N2 - Energy transduction of dielectric elastomers involves minute electrical and mechanical losses, both of which potentially increase the temperature within the elastomer. Thermal breakdown of dielectric elastomers occur when heat generated therein cannot be balanced by heat loss on the surface, which is more likely to occur in stacked dielectric elastomers. In this paper an electro-thermal model of a multilayered dielectric elastomer able to predict the possible number of layers in a stack before thermal breakdown occurs is presented. Simulation results show that point of breakdown is greatly affected by an increase in surrounding temperature and applied electric field. Furthermore, if the stack diameter is large, thermal insulation of the cylindrical surface is a valid approximation. Two different expressions for the electrical conductivity are used, and it is concluded that the Frank-Kamenetskii expression is more conservative in prediction of point of breakdown than the Arrhenius expression, except at high surrounding temperature. This article is protected by copyright. All rights reserved.

AB - Energy transduction of dielectric elastomers involves minute electrical and mechanical losses, both of which potentially increase the temperature within the elastomer. Thermal breakdown of dielectric elastomers occur when heat generated therein cannot be balanced by heat loss on the surface, which is more likely to occur in stacked dielectric elastomers. In this paper an electro-thermal model of a multilayered dielectric elastomer able to predict the possible number of layers in a stack before thermal breakdown occurs is presented. Simulation results show that point of breakdown is greatly affected by an increase in surrounding temperature and applied electric field. Furthermore, if the stack diameter is large, thermal insulation of the cylindrical surface is a valid approximation. Two different expressions for the electrical conductivity are used, and it is concluded that the Frank-Kamenetskii expression is more conservative in prediction of point of breakdown than the Arrhenius expression, except at high surrounding temperature. This article is protected by copyright. All rights reserved.

KW - Dielectric elastomer

KW - Thermal breakdown

KW - Electro-thermal model

KW - Electrical conductivity

KW - Multilayered

U2 - 10.1002/aic.16478

DO - 10.1002/aic.16478

M3 - Journal article

VL - 65

SP - 859

EP - 864

JO - A I Ch E Journal

JF - A I Ch E Journal

SN - 0001-1541

IS - 2

ER -