Electromechanical stability of wrinkled dielectric elastomers

Khurana, Aman; Joglekar, M. M.; Zurlo, Giuseppe

doi:10.1016/j.ijsolstr.2022.111613

Cited by 9 publications

(2 citation statements)

References 62 publications

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“…Similarly, introducing the Helmholtz free energy density ϕ R = ε R − ϑη R with ϕ R = jϕ and considering the energy balance (12), the inequality ( 16) becomes the following:…”

Section: Balance Laws and Entropy Inequalitymentioning

confidence: 99%

“…However, DEs may fail in their functionalities and structures when subjected to complicated or extreme environments. For example, a common design of DE film [11,12] or DE tube [13] may wrinkle or buckle because of the deformation induced by the interaction of charges with opposite signs on neighboring surfaces when an electric field is applied along the thickness direction. Besides, temperature fluctuations can influence the rate-dependent stress-strain relation and cause the electric and mechanical instability of DEs by changing their material properties [14,15].…”

Section: Introductionmentioning

confidence: 99%

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A Thermo-Electro-Viscoelastic Model for Dielectric Elastomers

Qin,

Zhong,

Zhang

2023

Materials

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Dielectric elastomers (DEs) are a class of electro-active polymers (EAPs) that can deform under electric stimuli and have great application potential in bionic robots, biomedical devices, energy harvesters, and many other areas due to their outstanding deformation abilities. It has been found that stretching rate, temperature, and electric field have significant effects on the stress-strain relations of DEs, which may result in the failure of DEs in their applications. Thus, this paper aims to develop a thermo-electro-viscoelastic model for DEs at finite deformation and simulate the highly nonlinear stress-strain relations of DEs under various thermo-electro-mechanical loading conditions. To do so, a thermodynamically consistent continuum theoretical framework is developed for thermo-electro-mechanically coupling problems, and then specific constitutive equations are given to describe the thermo-electro-viscoelastic behaviors of DEs. Furthermore, the present model is fitted with the experimental data of VHB4905 to determine a temperature-dependent function of the equilibrium modulus. A comparison of the nonlinear loading-unloading curves between the model prediction and the experimental data of VHB4905 at various thermo-electro-mechanical loading conditions verifies the present model and shows its ability to simulate the thermo-electro-viscoelastic behaviors of DEs. Simultaneously, the results reveal the softening phenomena and the instant pre-stretch induced by temperature and the electric field, respectively. This work is conducive to analyzing the failure of DEs in functionalities and structures from theoretical aspects at various thermo-electro-mechanical conditions.

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“…Similarly, introducing the Helmholtz free energy density ϕ R = ε R − ϑη R with ϕ R = jϕ and considering the energy balance (12), the inequality ( 16) becomes the following:…”

Section: Balance Laws and Entropy Inequalitymentioning

confidence: 99%