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dc.contributor.authorSu, Y.P.
dc.contributor.authorChen, W.Q.
dc.contributor.authorDestrade, Michel
dc.identifier.citationSu, Y. P., Chen, W. Q., & Destrade, M. (2019). Tuning the pull-in instability of soft dielectric elastomers through loading protocols. International Journal of Non-Linear Mechanics, 113, 62-66. doi:
dc.description.abstractPull-in (or electro-mechanical) instability occurs when a drastic decrease in the thickness of a dielectric elastomer results in electrical breakdown, which limits the applications of dielectric devices. Here we derive the criterions for determining the pull-in instability of dielectrics actuated by different loading methods: voltage-control, charge-control, fixed pre-stress and fixed pre-stretch, by analyzing the free energy of the actuated systems. The Hessian criterion identifies a maximum in the loading curve beyond which the elastomer will stretch rapidly and lose stability, and can be seen as a path to failure. We present numerical calculations for neo-Hookean ideal dielectrics, and obtain the maximum allowable actuation stretch of a dielectric before failure by electrical breakdown. We find that applying a fixed pre-stress or a fixed pre-stretch to a charge-driven dielectric may decrease the stretchability of the elastomer, a scenario which is the opposite of what happens in the case of a voltage-driven dielectric. Results show that a reversible large actuation of a dielectric elastomer, free of the pull-in instability, can be achieved by tuning the actuation method.en_IE
dc.description.sponsorshipThis work was supported by a Government of Ireland Postdoctoral Fellowship from the Irish Research Council, Ireland (No. GOIPD/2017/1208) and by the National Natural Science Foundation of China (No. 11621062). WQC and YPS also acknowledge the support from the Shenzhen Scientific and Technological Fund for R&D, China (No. JCYJ20170816172316775). MD thanks Zhejiang University, China for funding research visits to Hangzhou, and Alain Goriely and Giuseppe Saccomandi for the invitation and support to attend the conference on “Mathematics & Mechanics: Natural Philosophy in the 21st Century” at Oxford University in June 2018.en_IE
dc.relation.ispartofInternational Journal Of Non-Linear Mechanicsen
dc.subjectPull-in instabilityen_IE
dc.subjectActuation stretchen_IE
dc.subjectActuation methodsen_IE
dc.subjectElectrical breakdownen_IE
dc.titleTuning the pull-in instability of soft dielectric elastomers through loading protocolsen_IE
dc.contributor.funderIrish Research Councilen_IE
dc.contributor.funderNational Natural Science Foundation of Chinaen_IE
dc.contributor.funderShenzhen Scientific and Technological Fund for R&D, Chinaen_IE
dc.contributor.funderZhejiang University, Chinaen_IE
dc.local.contactMichel Destrade, Room Adb-1002, Áras De Brun, School Of Mathematics, Nui Galway. 2344 Email:

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