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Instabilities in multilayered soft dielectrics

Instabilities in multilayered soft dielectrics,10.1016/j.jmps.2010.10.001,Journal of The Mechanics and Physics of Solids,Katia Bertoldi,Massimiliano G

Instabilities in multilayered soft dielectrics   (Citations: 6)
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Experimental observations clearly show that the performance of dielectric elastomeric-based devices can be considerably improved using composite materials. A critical issue in the development of composite dielectric materials toward applications is the prediction of their failure mechanisms due to the applied electromechanical loads. In this paper we investigate analytically the influence of electromechanical finite deformations on the stability of multilayered soft dielectrics under plane-strain conditions. Four different criteria are considered: (i) loss of positive definiteness of the tangent electroelastic constitutive operator, (ii) existence of diffuse modes of bifurcation (microscopic modes), (iii) loss of strong ellipticity of the homogenized continuum (localized or macroscopic modes), and (iv) electric breakdown. While the formulation is developed for generic isotropic hyperelastic dielectrics, results are presented for the special class of ideal dielectrics incorporating a neo-Hookean elastic response. The effect of material properties and loading conditions is investigated, providing a detailed picture of the different possible failure modes.
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    • ...In recent years, the pull-in instability has been analyzed within the context of dielectric elastomer transducers [17–24]...

    Bo Liet al. Extension limit, polarization saturation, and snap-through instability...

    • ...More recently, Bertoldi and Gei [4] investigated instabilities in soft neo-Hookean layered dielectrics in which the electric field is perpendicular to the layers and pre-stretch is applied along the layers...
    • ...from the fact that for this class of materials a rigorous explicit expression for the homogenized anisotropic energy-density function can be determined [4,8]...
    • ...Bertoldi and Gei [4] considered this class of composites under specific loading conditions that are aligned with the layers...
    • ...The dashed curves for Θ = 0 in Fig. 2a, c are identical to the ones determined by Bertoldi and Gei [4]...
    • ...For the case Θ = 0, this result was previously determined by Bertoldi and Gei [4]...

    Stephan Rudykhet al. Stability of anisotropic electroactive polymers with application to la...

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