Stacked dielectric tubes with electromechanically controlled radii

Cohen, Noy

doi:10.1016/j.ijsolstr.2016.09.014

Cited by 18 publications

(12 citation statements)

References 25 publications

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“…Equation (21) is solved by means of the plane wave expansion method. The simplicity of the method has led to its popularity in calculating band diagrams in quantum mechanics and optics, and also in solid mechanics (Kushwaha et al 1993, Sigalas and Economou 1996b, Vasseur et al 2002, Barnwell et al 2016, 2017, Getz et al 2016. The method rests on the fact that plane waves constitute a basis for the solution of equation (21).…”

Section: A Soft Dielectric Tube In a Radial Electric Fieldmentioning

confidence: 99%

Tuning sound with soft dielectrics

Bortot

Gal

2017

Smart Mater. Struct.

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Soft dielectric tubes undergo large deformations when subjected to radial voltage. Using the theory of nonlinear electroelasticity, we investigate how voltage-controlled deformations of these tubes in an array alter acoustic wave propagation through it. We show that the propagation is annihilated across a certain audible frequency range, referred to as a sonic band gap. We carry out a numerical study, to find that the band gap depends nonlinearly on the voltage, owing to geometrical and material nonlinearities. By analyzing different mechanical constraints, we demonstrate that snap-through instabilities resulting from these nonlinearities can be harnessed to achieve sharp transitions in the gap width. Our conclusions hint at a new strategy to adaptively filter sound using a simple control parameter-an applied voltage.

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Section: A Soft Dielectric Tube In a Radial Electric Fieldmentioning

confidence: 99%

Tuning sound with soft dielectrics

Bortot

Gal

2017

Smart Mater. Struct.

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“…To model electrode protection from aggressive agents, achieve greater actuation and improve the efficiency of energy harvesting, some researchers have proposed laminated or stacked SEA actuators and energy harvesters (Kovacs et al, 2009;Tutcuoglu and Majidi, 2014;Calabrese et al, 2018), which have been recently studied theoretically by Gei et al (2013), Cohen (2017), or Bortot (2019).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear response and axisymmetric wave propagation in functionally graded soft electro-active tubes

Wu,

Destrade,

Chen

2020

Preprint

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Soft electro-active (SEA) materials can be designed and manufactured with gradients in their material properties, to modify and potentially improve their mechanical response in service. Here, we investigate the nonlinear response of, and axisymmetric wave propagation in a soft circular tube made of a functionally graded SEA material and subject to several biasing fields, including axial pre-stretch, internal/external pressure, and through-thickness electric voltage. We take the energy density function of the material to be of the Mooney-Rivlin ideal dielectric type, with material parameters changing linearly along the radial direction. We employ the general theory of nonlinear electro-elasticity to obtain explicitly the nonlinear response of the tube to the applied fields. To study wave propagation under inhomogeneous biasing fields, we formulate the incremental equations of motion within the state-space formalism. We adopt the approximate laminate technique to derive the analytical dispersion relations for the small-amplitude torsional and longitudinal waves superimposed on a finitely deformed state. Comprehensive numerical results then illustrate that the material gradients and biasing fields have significant influences on the static nonlinear response and on the axisymmetric wave propagation in the tube. This study lays the groundwork for designing SEA actuators with improved performance, for tailoring tunable SEA waveguides, and for characterizing non-destructively functionally graded tubular structures.

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“…Wu et al (2017) proposed the use of guided circumferential waves for the ultrasonic non-destructive on-line SHM to detect defects or cracks and for the self-sensing of the actual state of the tube. Cohen (2017) investigated the properties of a tube made up of stacked cylindrical dielectric layers separated by flexible electrodes, showing that increasing the number of layers in a stacked cylindrical actuator may lead to instabilities even if the outer radius is fixed. Bortot and Shmuel (2017) proposed a smart system based on an array of soft dielectric tubes for tuning sound.…”

Section: Introductionmentioning

confidence: 99%

Analysis of multilayer electro-active tubes under different constraints

Bortot

2018

Journal of Intelligent Material Systems and Structures

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Dielectric elastomers are an emerging class of highly deformable electro-active materials employed for electromechanical transduction technology. For practical applications, the design of such transducers requires a model accounting for insulation of the active membrane, non-perfectly compliant behaviour of the electrodes or interaction of the transducer with a soft actuated body. To this end, a three-layer model, in which the active membrane is embedded between two soft passive layers, can be formulated. In this paper, the theory of nonlinear electro-elasticity for heterogeneous soft dielectrics is used to investigate the electromechanical response of multilayer electro-active tubes-formed either by the active membrane only (singlelayer tube) or by the coated active membrane (multilayer tube). Numerical results showing the influence of the mechanical and the geometrical properties of the soft coating layers on the electromechanical response of the active membrane are presented for different constraint conditions.

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Stacked dielectric tubes with electromechanically controlled radii

Cited by 18 publications

References 25 publications

Tuning sound with soft dielectrics

Tuning sound with soft dielectrics

Nonlinear response and axisymmetric wave propagation in functionally graded soft electro-active tubes

Analysis of multilayer electro-active tubes under different constraints

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