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  • AIP Publishing  (8)
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  • AIP Publishing  (8)
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  • 1
    Online Resource
    Online Resource
    Modeling of dielectric elastomer as electromechanical resonator
    AIP Publishing ; 2014
    In:  Journal of Applied Physics Vol. 116, No. 12 ( 2014-09-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 116, No. 12 ( 2014-09-28)
    Abstract: Dielectric elastomers (DEs) feature nonlinear dynamics resulting from an electromechanical coupling. Under alternating voltage, the DE resonates with tunable performances. We present an analysis of the nonlinear dynamics of a DE as electromechanical resonator (DEER) configured as a pure shear actuator. A theoretical model is developed to characterize the complex performance under different boundary conditions. Physical mechanisms are presented and discussed. Chaotic behavior is also predicted, illustrating instabilities in the dynamics. The results provide a guide to the design and application of DEER in haptic devices.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4896584
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Dynamic electromechanical performance of viscoelastic dielectric elastomers
    AIP Publishing ; 2013
    In:  Journal of Applied Physics Vol. 114, No. 13 ( 2013-10-07)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 114, No. 13 ( 2013-10-07)
    Abstract: Because of their viscoelasticity, dielectric elastomers (DEs) are able to produce a large time-dependent electromechanical deformation. In the current study, we use the Euler-Lagrange equation to characterize the influence of temperature, excitation frequency, and viscoelasticity on the dynamic electromechanical deformation and stability of viscoelastic dielectrics. We investigate the time-dependent dynamic performance, hysteresis, phase diagram, and Poincaré map associated with the viscoelastic dissipative process. The results show that the dynamic response has strong temperature and frequency dependencies. It is observed that the natural frequency of the DE decreases with increasing temperature and the maximal amplitude increases at higher temperatures. At relative low frequencies, the amplitude is very small and the viscoelasticity has a significant effect on the oscillation of the system. Furthermore, the results show that the viscoelasticity has a relatively major influence on the dynamic performance for DEs that have very low relaxation times.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4823861
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Electromechanical properties of soft dissipative dielectric elastomer actuators influenced by electrode thickness and conductivity
    AIP Publishing ; 2020
    In:  Journal of Applied Physics Vol. 127, No. 18 ( 2020-05-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 127, No. 18 ( 2020-05-14)
    Abstract: Viscoelasticity and charge leakage are two typical dissipations of a dielectric elastomer (DE). During applied voltage loading, the electrodes tune the electromechanical deformation of DE, which results from the non-ideal insulator attribute of the DE. In this article, the influence of the electrodes is considered to establish a thorough electrodes-coupled dissipative model of DE. The effect that electrode thickness and conductivity has on the static and dynamic properties of the DE is investigated, including the electromechanical deformation of DE membrane and the voltage loaded across the thickness direction. It is found that the electromechanical deformation and voltage across the DE membrane gradually reduce with increasing electrode thickness and decreasing electrode conductivity. Resonance characteristics of the DE for varying electrode thickness and conductivity are also analyzed. The results demonstrate that electrodes with minimal thickness and high conductivity mitigate the resonant frequency and enhance the vibration intensity of the DE system.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0001580
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Modeling of the dynamic characteristic of viscoelastic dielectric elastomer actuators subject to different conditions of mechanical load
    AIP Publishing ; 2015
    In:  Journal of Applied Physics Vol. 117, No. 8 ( 2015-02-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 117, No. 8 ( 2015-02-28)
    Abstract: Subject to a mechanical load or a voltage, a membrane of a dielectric elastomer deforms. As for the deformation mode, the dynamic performance and stability are strongly affected by how mechanical forces are applied. In the current study, by using the Euler-Lagrange equation, an analytical model is developed to characterize the dynamic performance of a homogeneously deformed viscoelastic dielectric elastomer under the conditions of equal-biaxial force, uniaxial force, and pure shear state, respectively. Numerical results are shown to describe the electromechanical deformation and stability. It is observed that the resonant frequency (where the amplitude-frequency curve peaks) has dependencies on the deformation mode, the level of mechanical load, and the applied electric field. When a dielectric elastomer membrane is subject to equal-biaxial force or pure shear state, it undergoes a nonlinear quasi-periodic vibration. An aperiodic motion of the dielectric elastomer system is induced by the boundary condition of a uniaxial force.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4913384
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 5
    Online Resource
    Online Resource
    Modeling nonlinear dynamic properties of dielectric elastomers with various crosslinks, entanglements, and finite deformations
    AIP Publishing ; 2018
    In:  Journal of Applied Physics Vol. 123, No. 8 ( 2018-02-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 123, No. 8 ( 2018-02-28)
    Abstract: Subject to an AC voltage, dielectric elastomers (DEs) behave as a nonlinear vibration, implying potential applications as soft dynamical actuators and robots. In this article, by utilizing the Lagrange's equation, a theoretical model is deduced to investigate the dynamic performances of DEs by considering three internal properties, including crosslinks, entanglements, and finite deformations of polymer chains. Numerical calculations are employed to describe the dynamic response, stability, periodicity, and resonance properties of DEs. It is observed that the frequency and nonlinearity of dynamic response are tuned by the internal properties of DEs. Phase paths and Poincaré maps are utilized to detect the stability and periodicity of the nonlinear vibrations of DEs, which demonstrate that transitions between aperiodic and quasi-periodic vibrations may occur when the three internal properties vary. The resonance of DEs involving the three internal properties of polymer chains is also investigated.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.5019300
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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    Online Resource
  • 6
    Online Resource
    Online Resource
    Ambient humidity altering electromechanical actuation of dielectric elastomers
    AIP Publishing ; 2019
    In:  Applied Physics Letters Vol. 115, No. 18 ( 2019-10-28)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 115, No. 18 ( 2019-10-28)
    Abstract: The electromechanical actuation performance of dielectric elastomers is strongly affected by the environmental conditions, such as ambient humidity. The dielectric constant of the Very-High-Bond (VHB) 4910 elastomer is first experimentally investigated under different ambient humidities. Subsequently, at a constant DC voltage, the induced deformation of the VHB 4910 elastomer is found to be augmented when the ambient humidity increases. Theoretical simulation is simultaneously performed for the electromechanical actuation of VHB 4910 under several humidities. Finally, by applying a ramp voltage, the experimental results demonstrate that the electromechanical breakdown field of the VHB elastomer decreases with humidity.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5126654
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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    Online Resource
  • 7
    Online Resource
    Online Resource
    Viscoelastic creep and relaxation of dielectric elastomers characterized by a Kelvin-Voigt-Maxwell model
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 110, No. 4 ( 2017-01-23)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 110, No. 4 ( 2017-01-23)
    Abstract: For dielectric elastomers (DEs), the inherent viscoelasticity leads to a time-dependent deformation during actuation. To describe such a viscoelastic behavior, a constitutive model is developed by utilizing a combined Kelvin-Voigt-Maxwell (KVM) model. The established model captures both the initial jumping deformation and the following slow creeping. Subsequently, with an employment of VHB 4910 elastomer, experiments are performed to validate the viscoelastic KVM model. The results indicate a good agreement between the simulation and experimental data. Effect of the parameters in KVM model on the viscoelastic deformation of DEs is also investigated.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4974991
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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    Online Resource
  • 8
    Online Resource
    Online Resource
    Viscoelastic creep elimination in dielectric elastomer actuation by preprogrammed voltage
    AIP Publishing ; 2014
    In:  Applied Physics Letters Vol. 105, No. 21 ( 2014-11-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 105, No. 21 ( 2014-11-24)
    Abstract: Viscoelasticity causes a time-dependent deformation and lowers the response speed and energy conversion efficiency of VHB-based dielectric elastomers (DEs), thus seriously restricting a wide range of applications of this otherwise versatile soft smart material. The viscoelastic deformation of a prestretched VHB film in a circular actuator configuration is studied both theoretically and experimentally. By adjusting the applied voltage, viscoelastic creep can be dispelled and an invariable strain is obtained by simulation. Subsequently, an experiment was designed to validate the simulation and the results indicate that a constant strain can be achieved by preprogramming the applied actuation voltage.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4903059
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
    Location Call Number Limitation Availability
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    Online Resource
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