A compact dielectric elastomer tubular actuator for refreshable Braille displays

Chakraborti, Parthasarathi; Toprakçi, Hatice Aylin Karahan; Yang, P. C.; Spigna, Neil Di; Franzon, Paul D.; Ghosh, Tushar K.

doi:10.1016/j.sna.2012.02.004

Cited by 109 publications

(65 citation statements)

References 32 publications

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“…In the same example, the dynamic instability field is obtained as 21.29kV/mm, which exactly matches with our estimate obtained by employing Eq. (13). It can thus be inferred that the present approach ameliorates the estimates of the dynamic instability parameters currently available in the literature and also provides useful explicit dimensionless estimates of those parame ters.…”

Section: Comparison Of Static and Dynamic Instabilitymentioning

confidence: 56%

“…Upon applying a potential difference between the two electrodes, the membrane contracts in its thick ness direction and expands laterally [6]. These areal strains have been observed to reach well beyond 100% and are utilized to gener ate the actuating forces or motions [7,8], In the recent past, the util ity of DEAs has been demonstrated in applications that include, but not limited to the artificial muscles [3], resonators [9,10], prosthetic limbs [11], acoustic actuators [12], Braille display [13], energy har vesting devices [14], etc.…”

Section: Introductionmentioning

confidence: 99%

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An Energy-Based Approach to Extract the Dynamic Instability Parameters of Dielectric Elastomer Actuators

Joglekar

2014

Journal of Applied Mechanics

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An energy-based approach is presented to extract the thresholds on the transient dynamic response of step voltage driven dielectric elastomer actuators (DEAs). The proposed approach relies on establishing the energy balance at the point of maximum stretch in an oscillation cycle followed by the application of an instability condition to extract the dynamic instability parameters. Explicit expressions are developed for the critical values of maximum stretch and the corresponding nominal electric field, thus circumventing the need to perform iterative time-integrations of the equation of motion. The underlying principles of the approach are enunciated for the neo-Hookean material model and further extended to analyze relatively complex multiparameter hyperelastic models (Mooney-Rivlin and Ogden) that are employed prevalently for investigating the behavior of DEAs. The dynamic instability parameters predicted using the energy method are vali dated by examining the time-history response of the actuator in the vicinity of the dynamic instability. The development of dynamic instability parameters is complemented by energy-based extraction of static instability parameters to facilitate a quick compari son between the two. It is inferred quantitatively that the nominal electric field sufficient to cause the dynamic instability and the corresponding thickness stretch is lower than those corresponding to the static instability. A set of representative case studies for multi parameter material models is presented at the end, which can be used as an input for fur ther experimental corroboration. The results of the present investigation can find their potential use in the design of DEAs subjected to transient loading.

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Section: Comparison Of Static and Dynamic Instabilitymentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

An Energy-Based Approach to Extract the Dynamic Instability Parameters of Dielectric Elastomer Actuators

Joglekar

2014

Journal of Applied Mechanics

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“…Dielectric elastomer actuators (DEAs) have found a number of applications in tactile displays [1][2][3], adaptable lenses and gratings [4], sound systems [5], (bio-mimicking) robotics [6][7][8], and sensors [9,10]. They are well established in research but currently require driving voltages well above 100 V, which makes them unsuitable for use in areas such as medical implants.…”

Section: Introductionmentioning

confidence: 99%

Molecular beam deposition of high-permittivity polydimethylsiloxane for nanometer-thin elastomer films in dielectric actuators

et al. 2016

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a b s t r a c tTo realize low-voltage dielectric elastomer actuators (DEAs) for artificial muscles, a high-permittivity elastomer and a related thin-film deposition technique must be selected. For polydimethylsiloxane, fillers or functionalized crosslinkers have been incorporated into the elastomer to improve dielectric properties. To produce elastomer layers nanometers thin, molecular beam deposition was introduced. We pursue the synthesis of a high-permittivity oligomer, namely a chloropropyl-functional, vinyl-terminated siloxane to be thermally evaporated and subsequent UV curing to form an elastomer. The synthesized oligomer exhibits dielectric permittivity enhanced by 33% and a breakdown increase of 26% with respect to the commercially available oligomer DMS-V05. Films 160 nm thin were fabricated after being evaporated under ultra-high vacuum conditions. Spectroscopic ellipsometery served for film growth monitoring. Using atomic force microscopy, the film surface morphology and mechanics were characterized after growth termination and subsequent curing. The Young's modulus of the elastomer corresponded to (1.8 ± 0.2) MPa and is thus a factor of two lower than that of DMS-V05. Consequently, the properties of the films prepared by the new elastomer can be quantified by the normalized figure of merit, which estimates to 4.6. The presented approach is an essential step toward the realization of low-voltage DEA for medical applications and beyond.

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“…However, when the electric field is revoked, the elastomer returns to its original state [5,6]. DE, an ideal material for manufacturing miniature robot devices [7][8][9][10][11][12][13][14], has attracted significant attention of the scientific researchers because of its extraordinary and fascinating features including high energy density, large deformation capacity, rapid response (short response time), high electromechanical conversion efficiency, light weight, and low price [15].…”

Section: Introductionmentioning

confidence: 99%

“…Over the past decades, extensive research efforts have been devoted to the comprehensive theoretical and experimental studies on the properties of the material, in particular, in the area of smart devices [12][13][14]. Nevertheless, the driving electric field strength is very high ([100 MV m -1 ) in commonly used DE materials because of its low dielectric constant (e).…”

Section: Introductionmentioning

confidence: 99%

Electroactive strain properties of acrylic resin elastomer-based composite films

et al. 2015

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Copper phthalocyanine oligomer (CuPc) possessing high dielectric constant was grafted onto acrylic elastomer (ACM) backbones to fabricate elastomeric nanocomposites (referred to here as ACM-g-CuPc) with high dielectric constant. High strain of ACM-g-CuPc film could be achieved at low electric field. The electric field-induced strain properties of ACM-g-CuPc films were studied from four aspects: the pre-stretch value, butyl acrylate (BA) content, active region-towindow radius ratio, and strain hysteresis. The results revealed that the area strain in the active region first increased and then decreased with the increase in the prestretch value; however, it increased with the increase in BA content and decreased with the increase in the active region-to-window radius ratio. When the active region-to-window radius ratio was 1:5, the ACM-g-CuPc film with 60 wt% BA content and 150 9 150 % pre-stretch value exhibited the maximum area strain of 23.8 % under an electric field of 12.5 MV m -1 . In a complete driving period, ACM-g-CuPc film exhibited a strain hysteresis phenomenon, forming a strain hysteresis loop.

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A compact dielectric elastomer tubular actuator for refreshable Braille displays

Cited by 109 publications

References 32 publications

An Energy-Based Approach to Extract the Dynamic Instability Parameters of Dielectric Elastomer Actuators

An Energy-Based Approach to Extract the Dynamic Instability Parameters of Dielectric Elastomer Actuators

Molecular beam deposition of high-permittivity polydimethylsiloxane for nanometer-thin elastomer films in dielectric actuators

Electroactive strain properties of acrylic resin elastomer-based composite films

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