Actuation Response of Polyacrylate Dielectric Elastomers

Kofod, Guggi; Sommer‐Larsen, Peter; Kornbluh, Roy; Pelrine, Ron

doi:10.1177/104538903039260

Cited by 472 publications

(411 citation statements)

References 19 publications

Supporting

Mentioning

388

Contrasting

Unclassified

Order By: Relevance

“…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%

See 1 more Smart Citation

Mechanics of dielectric elastomers: materials, structures, and devices

Qian

2016

JZUS-A

View full text Add to dashboard Cite

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.

show abstract

Section: Three Types Of De Transducersmentioning

confidence: 99%

“…Experimental observations have found that the permittivity ε of some DEs is nearly constant during deformation (Kofod et al, 2001;Zhang et al, 2005). A reasonable explanation of this observation is the following: such elastomers are 3D networks consisting of long and flexible polymer chains, which interconnect via covalent cross-links.…”

Section: Ideal Desmentioning

confidence: 99%

Mechanics of dielectric elastomers: materials, structures, and devices

Qian

2016

JZUS-A

View full text Add to dashboard Cite

show abstract

“…A sketch and a picture of a sample, together with the reference axes, are shown in Figure 1Figure 2 and Figure 3 respectively. In order to obtain appreciable displacements, the samples have been pre-stretched so that the electric field can be increased without reaching the breakdown voltage [11], in accordance with equation (1). The shape and the dimension of the electrodes respect to the mechanical constraints have been chosen in order to obtain an almost monodirectional in-plane deformation of the film, along y axis, whereas the deformation in x direction can be neglected.…”

Section: Methodsmentioning

confidence: 99%

Monodirectional Positioning Using Dielectric Elastomers

Pagano¹,

Malosio²,

Fassi³

2010

Precision Assembly Technologies and Systems

View full text Add to dashboard Cite

Abstract.The rationales for the use of microsystems are numerous, including the reduction of consumables, a faster response time, the enhanced portability, the higher resolution, and the higher efficiency; moreover their application sectors are numerous. Nevertheless microproducts have still great difficulty in penetrating the market, mainly due to the limits of the fabrication processes. The hybrid approach is suitable for the fabrication of three dimensional microscopic structures but often requires manual contributions, which are time consuming and expensive. In order to overcome these issues, new materials and new techniques for the manipulation of microcomponents, based on innovative principles, have been conceived and have to be further developed. In this paper polymeric smart materials, namely electroactive polymers, have been theoretically and experimentally investigated towards their implementation in the actuation and sensing of positioning and handling devices. The feasibility of a monodirectional positioner has been studied.

show abstract

“…Dielectric elastomers (DEs) belong to a general class of Electro Active Polymers (EAPs) with remarkable actuation properties [4][5][6][7]. Recently, Li et al [8] have reported an outstanding voltage induced area expansion of 1980% on a Dielectric Elastomer membrane film.…”

Section: Introductionmentioning

confidence: 99%

A computational framework for large strain nearly and truly incompressible electromechanics based on convex multi-variable strain energies

Ortigosa

Gil

Lee

2016

Computer Methods in Applied Mechanics and Engineering

View full text Add to dashboard Cite

Please cite this article as: R. Ortigosa, A.J. Gil, C.H. Lee, A computational framework for large strain nearly and truly incompressible electromechanics based on convex multi-variable strain energies, Comput. Methods Appl. Mech. Engrg. (2016), http://dx.doi.org/10. 1016/j.cma.2016.06.025 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A computational framework for large strain nearly and truly incompressible electromechanics based on convex multi-variable strain energies. AbstractThe series of papers published by Gil and Ortigosa [1-3] introduced a new convex multi-variable variational and computational framework for the numerical simulation of Electro Active Polymers (EAPs) in scenarios characterised by extreme deformations and/or extreme electric fields. Building upon this body of work, five key novelties are incorporated in this paper. First, a generalisation of the concept of multi-variable convexity to energy functionals additively decomposed into isochoric and volumetric components. This decomposition is typical of nearly and truly incompressible materials, group which represents the majority of the most relevant EAPs. Second, convexification or regularisation strategies are applied to a priori non-convex multi-variable isochoric functionals to yield physically meaningful convex multi-variable functionals. Third, based on the mixed variational principles introduced in Reference [1] in the context of compressible electro-elasticity, a novel extended Hu-Washizu mixed variational principle for nearly and truly incompressible scenarios is presented. From the computational standpoint, a static condensation procedure is applied in order to condense out the element-wise extra fields, the resulting formulation having a comparable cost to the more standard three-field displacement-potential-pressure mixed formulation. Fourth, the computational framework for the three-field mixed variational principle in nearly and truly incompressible scenarios is also presented. In this case, the novelty resides in the consideration of convex multi-

show abstract

Actuation Response of Polyacrylate Dielectric Elastomers

Cited by 472 publications

References 19 publications

Mechanics of dielectric elastomers: materials, structures, and devices

Mechanics of dielectric elastomers: materials, structures, and devices

Monodirectional Positioning Using Dielectric Elastomers

A computational framework for large strain nearly and truly incompressible electromechanics based on convex multi-variable strain energies

Contact Info

Product

Resources

About