Electrically-induced twist in geometrically incompatible dielectric elastomer tubes

Bazaev, Kristina; Cohen, Noy

doi:10.1016/j.ijsolstr.2022.111707

Cited by 11 publications

(2 citation statements)

References 47 publications

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“…1 mm, and L = 10 mm. The properties are taken as those of VHB 4910, which is an acrylic adhesive commonly employed as a DE [24,32,[61][62][63][64][65][66][67]. Accordingly, we set the relative permittivity ε r = 4.7 and the initial shear modulus α 1 = G = 73 kPa.…”

Section: Energy Harvesting In De Tubesmentioning

confidence: 99%

Energy harvesting with dielectric elastomer tubes: active and (responsive materials-based) passive approaches

Hanuhov,

Brighenti,

Cohen

2024

Smart Mater. Struct.

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Mechanical to electrical energy conversion is a well-established energy transduction approach. However, cases in which a mechanical energy source is not available call for new approaches to harvest electrical energy. In the present study, we demonstrate energy harvesting in soft dielectric elastomer (DE) tubes. Broadly, energy harvesting is obtained through inflation of the tube, electrical charging of the DE layer, and deflation, which results in a decrease in capacitance and an increase in voltage. We propose two methods to mechanically charge (or inflate) the system: (1) active, in which the tube is inflated through the application of mechanical pressure, and (2) passive, in which a passive cylindrical component placed inside the DE tube deforms radially in response to an environmental stimulus such as thermal excitation or water uptake and inflates the DE tube. To demonstrate passive charging, we consider gels as the passive component and employ well-known models with the properties of the commonly employed DE VHB 4910 to simulate the mechanical response of the system and estimate the harvested electrical energy. Our findings reveal that energy-densities in the order of ∼ 10 − 50mJ/cm3 can be harvested. The proposed approach and the inclusion of a passive component to mechanically charge the system opens new opportunities to generate energy in environments lacking traditional mechanical energy sources.

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Section: Energy Harvesting In De Tubesmentioning

confidence: 99%

Energy harvesting with dielectric elastomer tubes: active and (responsive materials-based) passive approaches

Hanuhov,

Brighenti,

Cohen

2024

Smart Mater. Struct.

Self Cite

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“…The authors examined how material properties, the fiber's helical angle, and mechanical loads, such as internal pressure, axial force, and twist moment, influence the DE actuator's voltage-induced torsional behavior. Bazaev and Cohen [92] explored a new design for a DE-based bi-layer tubular structure, functioning as an electrically activated torsional actuator. The bi-layer tube was constructed by twisting an isotropic Gent tube, inserting it into another tube, and adhering the two layers at their interface, creating residual stress and making the layers geometrically incompatible.…”

Section: Torsionmentioning

confidence: 99%

Electromechanical Deformations and Bifurcations in Soft Dielectrics: A Review

Su,

Shen,

Zhao

et al. 2024

Materials

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Dielectric elastomers have attracted considerable attention both from academia and industry alike over the last two decades due to their superior mechanical properties. In parallel, research on the mechanical properties of dielectrics has been steadily advancing, including the theoretical, experimental, and numerical aspects. It has been recognized that the electromechanical coupling property of dielectric materials can be utilized to drive deformations in functional devices in a more controllable and intelligent manner. This paper reviews recent advances in the theory of dielectrics, with specific attention focused on the theory proposed by Dorfmann and Ogden. Additionally, we provide examples illustrating the application of this theory to analyze the electromechanical deformations and the associated bifurcations in soft dielectrics. We compared the bifurcations in elastic and dielectric materials and found that only compressive bifurcation modes exist in elastic structures, whereas both compressive and tensile modes coexist in dielectric structures. We summarize two proposed ways to suppress and prevent the tensile bifurcations in dielectric materials. We hope that this literature survey will foster further advancements in the field of the electroelastic theory of soft dielectrics.

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Finite deformations of a nonlinearly elastic electrosensitive tube reinforced by two fiber families

Kolesnikov

2022

Continuum Mech. Thermodyn.

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Electrically-induced twist in geometrically incompatible dielectric elastomer tubes

Cited by 11 publications

References 47 publications

Energy harvesting with dielectric elastomer tubes: active and (responsive materials-based) passive approaches

Energy harvesting with dielectric elastomer tubes: active and (responsive materials-based) passive approaches

Electromechanical Deformations and Bifurcations in Soft Dielectrics: A Review

Finite deformations of a nonlinearly elastic electrosensitive tube reinforced by two fiber families

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