Mechanisms of large actuation strain in dielectric elastomers

Koh, Soo Jin Adrian; Li, Tiefeng; Zhou, Jinxiong; Zhao, Xuanhe; Hong, Wei; Zhu, Jian; Suo, Zhigang

doi:10.1002/polb.22223

Cited by 269 publications

(236 citation statements)

References 42 publications

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“…The shape of (λ) can be readily showed that  B is a monotonically decreasing function of the stretch λ (Kofod et al, 2003;Koh et al, 2011;Suo, 2012). Depending on where the two curves of (λ) and  B intersect, DE transducers can be classified into three types Suo, 2010;Li et al, 2011), as illustrated in Figs …”

Section: Three Types Of De Transducersmentioning

confidence: 99%

Mechanics of dielectric elastomers: materials, structures, and devices

Qian

2016

JZUS-A

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Dielectric elastomers (DEs) respond to applied electric voltage with a surprisingly large deformation, showing a promising capability to generate actuation in mimicking natural muscles. A theoretical foundation of the mechanics of DEs is of crucial importance in designing DE-based structures and devices. In this review, we survey some recent theoretical and numerical efforts in exploring several aspects of electroactive materials, with emphases on the governing equations of electromechanical coupling, constitutive laws, viscoelastic behaviors, electromechanical instability as well as actuation applications. An overview of analytical models is provided based on the representative approach of non-equilibrium thermodynamics, with computational analyses being required in more generalized situations such as irregular shape, complex configuration, and time-dependent deformation. Theoretical efforts have been devoted to enhancing the working limits of DE actuators by avoiding electromechanical instability as well as electric breakdown, and pre-strains are shown to effectively avoid the two failure modes. These studies lay a solid foundation to facilitate the use of DE materials, structures, and devices in a wide range of applications such as biomedical devices, adaptive systems, robotics, energy harvesting, etc.

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Section: Three Types Of De Transducersmentioning

confidence: 99%

Mechanics of dielectric elastomers: materials, structures, and devices

Qian

2016

JZUS-A

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“…To precisely analyze effect of the passive region, its inhomogeneous stress field should be analyzed considering a continuous deformation between the passive and active region as demonstrated by Koh et al 9 and Plante and Dubowsky. 14 In conclusion, we demonstrated that the existing theoretical guidelines for large actuation strains based on VHB films cannot be directly implemented for castable elastomers.…”

Section: Fig 2 (A)mentioning

confidence: 99%

“…1 More recently, Rosset et al have shown a 60% linear planar strain on a PDMS based DEA with rise time of less than 10 ms. 8 However, the existing theoretical guidelines for large actuation deformation of DEAs developed based on VHB films cannot be directly implemented to castable elastomers. 9,10 Unlike VHB, which is available as films with predefined thicknesses, PDMS or polyurethane are initially a resin and can be casted to form membranes of any desired thickness. This decouples the thickness of the elastomer from the prestretch ratio allowing to select them independently.…”

Section: Improved Electromechanical Behavior In Castable Dielectric Ementioning

confidence: 99%

Improved electromechanical behavior in castable dielectric elastomer actuators

Akbari¹,

Rosset²,

Shea³

2013

Applied Physics Letters

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Design and optimization of voice coil actuator for six degree of freedom active vibration isolation system using Halbach magnet array Rev. Sci. Instrum. 83, 105117 (2012) The tracking control system of the VLT Survey Telescope Rev. Sci. Instrum. 83, 094501 (2012) Multi-functional dielectric elastomer artificial muscles for soft and smart machines App. Phys. Rev. 2012Rev. , 7 (2012 Additional information on Appl. Phys. Lett.

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“…While large voltage-induced deformation has been demonstrated for an elastomer sheet under equal-biaxial forces, [24][25][26] only small voltage-induced deformation has been observed for an elastomer sheet under a uniaxial force. 27 Many applications, however, require muscle-like actuators in which a voltage induces large and unidirectional displacement.…”

mentioning

confidence: 99%

Large, uni-directional actuation in dielectric elastomers achieved by fiber stiffening

Huang

Zhu

et al. 2012

Applied Physics Letters

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104

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Cylindrical actuators are made with dielectric elastomer sheets stiffened with fibers in the hoop direction. When a voltage is applied through the thickness of the sheets, large actuation strains are achievable in the axial direction, with or without pre-straining and mechanical loading. For example, actuation strains of 35.8% for a cylinder with a prestrain of 40%, and 28.6% for a cylinder without pre-strain have been achieved without any optimization. Furthermore, the actuation strain is independent of the aspect ratio of the cylinder, so that both large strains and large displacements are readily actuated by using long cylinders.

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Mechanisms of large actuation strain in dielectric elastomers

Cited by 269 publications

References 42 publications

Mechanics of dielectric elastomers: materials, structures, and devices

Mechanics of dielectric elastomers: materials, structures, and devices

Improved electromechanical behavior in castable dielectric elastomer actuators

Large, uni-directional actuation in dielectric elastomers achieved by fiber stiffening

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