A self-sensing dielectric elastomer actuator

Jung, Kwangmok; Kim, Kwang Jin; Choi, Hyouk Ryeol

doi:10.1016/j.sna.2007.10.076

Cited by 228 publications

(143 citation statements)

References 7 publications

Supporting

Mentioning

142

Contrasting

Unclassified

Order By: Relevance

“…Additionally metal particles are too large to create sufficient contacts, and a better conductivity can be obtained with carbon particles [24]. Metallic powders are therefore rarely used for DEAs, although a few articles report on the use of silver grease electrodes [25,26]. The relatively high electrical resistance of carbon-based electrodes does not play a primary role for actuators, as long as the electrical time constant of the device remains smaller than the mechanical bandwidth.…”

Section: Carbon Powdermentioning

confidence: 99%

Flexible and stretchable electrodes for dielectric elastomer actuators

2012

View full text Add to dashboard Cite

Dielectric elastomer actuators (DEAs) are flexible lightweight actuators that can generate strains of over 100%. They are used in applications ranging from haptic feedback (mm-sized devices), to cm-scale soft robots, to meter-long blimps. DEAs consist of an electrode-elastomer-electrode stack, placed on a frame. Applying a voltage between the electrodes electrostatically compresses the elastomer, which deforms in-plane or out-of plane depending on design. Since the electrodes are bonded to the elastomer, they must reliably sustain repeated very large deformations while remaining conductive, and without significantly adding to the stiffness of the soft elastomer. The electrodes are required for electrostatic actuation, but also enable resistive and capacitive sensing of the strain, leading to self-sensing actuators. This review compares the different technologies used to make compliant electrodes for DEAs in terms of: impact on DEA device performance (speed, efficiency, maximum strain), manufacturability, miniaturization, the integration of self-sensing and selfswitching, and compatibility with low-voltage operation. While graphite and carbon black have been the most widely used technique in research environments, alternative methods are emerging which combine compliance, conduction at over 100% strain with better conductivity and/or ease of patternability, including microfabrication-based approaches for compliant metal thin-films, metal-polymer nano-composites, nanoparticle implantation, and reel-to-reel production of µm-scale patterned thin films on elastomers. Such electrodes are key to miniaturization, low-voltage operation, and widespread commercialization of DEAs.

show abstract

Section: Carbon Powdermentioning

confidence: 99%

Flexible and stretchable electrodes for dielectric elastomer actuators

2012

View full text Add to dashboard Cite

show abstract

“…DEs have gained a deserved reputation as "artificial muscles" [2][3][4] because they behave similarly to biological muscles in terms of actuation pressure, energy conversion efficiency and response speed to stimulus. Hence DEs are used for intelligent applications such as tactile displays [5][6][7], bionic actuators [8][9][10][11][12] and other applications [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Investigation into the electromechanical properties of dielectric elastomers subjected to pre-stressing

Jiang¹,

Betts²,

Kennedy³

et al. 2015

Materials Science and Engineering: C

View full text Add to dashboard Cite

a b s t r a c t a r t i c l e i n f oDielectric elastomers (DEs) are being exploited for biological applications such as artificial blood pumps, biomimetic grippers and biomimetic robots. Generally, polyacrylate and silicone rubber (SR) are the most widely used materials for fabricating DEs in terms of mixing with other polymers or compounding them with highly dielectric particles. Furthermore, pre-stretch offers an effective approach to increasing actuated strain and dielectric strength and eliminating 'pull-in' instability. In the work described here, a comparison in electromechanical properties was made between SR/10% barium titanate (BaTiO 3 ) and commercial VHB 4910. Trends in these dielectric parameters are shown graphically for variation in pre-stretch ratio (λ pre ). It was found that permittivity of SR/10% BaTiO 3 was independent of frequency, whereas permittivity was frequency-independent due to the polarization of polymer chains. The maximum deformation and the coupling efficiency for SR/10% BaTiO 3 can be achieved at a pre-stretch ratio between 1.6 and 1.9. For VHB 4910, they can be obtained in the prestretch ratio range from 2.6 to 3.0. A maximum energy density of 0.05 MJ/m 3 was achieved by SR/10% BaTiO 3 (λ pre = 1.6) and VHB 4910 (λ pre = 3.4). The findings provide an insight into critical pre-stretch ratios required for a range of applications of DEs based on silicone and the commercially available polyacrylate VHB 4910.

show abstract

“…7, two points A(4, 0.5), B(25, 2.6) are substituted into Eq. (6), and result is x 0 = 30.2 mm, k = 0.05 N·mm 1 . Fig.…”

Section: Design Of Preload Mechanismmentioning

confidence: 99%

“…It can be used to make actuators, sensors [1] and energy harvesting equipments [2] . Compared with other smart actuating materials, such as Shape Memory Alloy (SMA), ionic EAP, dielectric elastomer shows excellent overall performance including large strain, high energy density, high force-to-weight ratio and lightweight.…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of Cone Dielectric Elastomer Actuator with Double-Slider Mechanism

2010

View full text Add to dashboard Cite

Dielectric Elastomer Actuators (DEA) have a wide application prospect in the area of robot due to its merits. The aim of this paper is to improve the displacement of cone DEA and to make full use of the large-strain advantage of elastomer, as well as to reduce the volume and mass of actuator. After presenting the manufacturing process and working principle of cone DEA, it is analyzed that negative stiffness preload can enlarge the displacement of actuator significantly. Then a half-diamond mechanism is analyzed using double-slider model to implement a negative stiffness preload. Two points from force-displacement curves, f off and f on of elastomer with voltage on and off, are selected as two working equilibrium positions of actuator to calculate the parameters of the preload mechanism, hereby the negative stiffness mechanism is realized. Displacement experiments show that the cone DEA has a displacement of 20 mm under voltage 7541V and experimental results agree well with analytical results. Since the initial displacement is very small, so the large-strain advantage of elastomer is used for improving the displacement of actuator. In addition, the force outputs of the actuator when voltage is on and off are acquired, which shows actuator has a maximal force ability of 1.6 N.

show abstract

A self-sensing dielectric elastomer actuator

Cited by 228 publications

References 7 publications

Flexible and stretchable electrodes for dielectric elastomer actuators

Flexible and stretchable electrodes for dielectric elastomer actuators

Investigation into the electromechanical properties of dielectric elastomers subjected to pre-stressing

Design and Implementation of Cone Dielectric Elastomer Actuator with Double-Slider Mechanism

Contact Info

Product

Resources

About