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Homogeneous large deformation analysis of a dielectric elastomer peristaltic actuator

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Science China(Technological Sciences) 2012年第2期55卷 537-541页

作者： WU XiaoHong SUN WenJie LI Bo CHEN HuaLing ZHOU JinXiong State Key Laboratory for Strength and Vibration and School of Aerospace Xi'an Jiaotong UniversityXi'an 710049China School of Mechanical Engineering Xi'an Jiaotong UniversityXi'an 710049China

A series of isometric,radially expanding tubular units,made of dielectric elastomer with compliant electrodes,constitute a soft linear peristaltic pump with distributed actuation for transport of incompressible *** on the Gent strain energy model,this paper theoretically analyzes the homogeneous large deformation of the peristaltic *** discuss the effects of axial prestretch on the actuation of the *** then predict the maximum actuation strain of this actuator which is limited by dielectric strength of the *** results presented here extend the previous study based on linear elasticity,and can predict the electromechanical behaviors of the novel actuator at large deformations.

关键词： dielectric elastomer peristaltic pump large deformation electromechanical actuation

Failure modeling of folded dielectric elastomer actuator

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Science China(Physics,Mechanics & Astronomy) 2014年第2期57卷 263-272页

作者： LIU LiWu ZHANG Zhen LIU YanJu LENG JinSong Department of Astronautical Science and Mechanics Harbin Institute of Technology Centre for Composite Materials Science Park of Harbin Institute of Technology

When subjected to voltage,the dielectric elastomer membrane reduces its thickness and expands its area under the resulting compressive *** characteristic enables the dielectric elastomer actuators of different structures to be designed and *** employing the thermodynamic theory and research method proposed by Suo et al.,an equilibrium equation of folded dielectric elastomer actuator with two generalized coordinates is *** governing equations of failure models involving electromechanical instability,zero electric field,electrical breakdown,loss of tension,and rupture by stretch are also *** allowable areas of folded dielectric elastomer actuators are *** results could provide a powerful guidance to the design and performance evaluation of the dielectric elastomer actuators.

关键词： dielectric elastomer folded dielectric elastomer actuator failure modes allowable area

Numerical study on the electromechanical behavior of dielectric elastomer with the influence of surrounding medium

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International Journal of Smart and Nano Materials 2016年第1期7卷 52-68页

作者： Kun Jia Tongqing Lu State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace EngineeringXi’an Jiaotong UniversityXi’anChina

The considerable electric-induced shape change,together with the attributes of lightweight,high efficiency,and inexpensive cost,makes dielectric elastomer,a promising soft active material for the realization of actuators in broad ***,a number of prototype devices have been demonstrated in the past few years,the further development of this technology necessitates adequate analytical and numerical ***,previous the-oretical studies always neglect the influence of surrounding *** to the large deformation and nonlinear equations of states involved in dielectric elastomer,finite element method(FEM)is anticipated;however,the few available formulations employ homemade codes,which are inconvenient to *** aim of this work is to present a numerical approach with the commercial FEM package COMSOL to investigate the nonlinear response of dielectric elastomer under electric *** influence of surrounding free space on the electric field is analyzed and the corresponding electric force is taken into account through an electric surface traction on the circumstances *** employ-ing Maxwell stress tensor as actuation pressure,the mechanical and electric governing equations for dielectric elastomer are coupled,and then solved simultaneously with the Gent model of stain energy to derive the electric induced large deformation as well as the electromechanical *** finite element imple-mentation presented here may provide a powerful computational tool to help design and optimize the engineering applications of dielectric elastomer.

关键词： dielectric elastomer electromechanical coupling finite element method Maxwell stress tensor

Electromechanical behavior of fiber-reinforced dielectric elastomer membrane

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International Journal of Smart and Nano Materials 2015年第2期6卷 124-134页

作者： Chi Li Yuhan Xie Guorui Li Xuxu Yang Yongbin Jin Tiefeng Li Institute of Applied Mechanics Zhejiang University38 Zheda RoadHangzhou 310027China

Based on its large deformation,light weight,and high energy density,dielectric elastomer(DE)has been used as driven muscle in many *** design the fiberreinforced DE membrane by adding fibers in the *** deformation and driven force direction of the membrane can be tuned by changing the fiber *** actuation in the perpendicular direction of the DE membrane with long fibers first increases and then decreases by the increasing of the fiber spacing in the perpendicular *** horizontal actuation of the membrane decreases by decreasing the spacing of short *** the membrane-inflating structure,the radially arranged fibers will break the axisymmetric behavior of the *** top area of the inflated balloon without fiber will buckle up when the voltage reaches a certain *** element simulations based on nonlinear field theory are conducted to investigate the effects of fiber arrangement and verify the experimental *** work can guide the design of fiber-reinforced DE.

关键词： dielectric elastomer fiber reinforced electromechanical

Poly(thioether)-b-polysiloxane-b-poly(thioether)triblock copolymer towards homogeneous dielectric elastomer with high dielectric performance

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Chinese Chemical Letters 2022年第8期33卷 4021-4025页

作者： Zhanbin Feng Jiafang Guo Suting Liu Guofei Feng Xing-Hong Zhang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Center of Chemistry for Frontier Technologies Zhejiang UniversityHangzhou 310027China Department of Chemical Engineering Weifang Vocational CollegeWeifang 262737China

dielectric elastomers(DEs)have drawn much attention owing to their application prospects in artificial muscles and soft robotics,it is still a big challenge to prepare DEs with high electromechanical *** work reports a highly stretchable poly(thioether)-b-polysiloxane-b-poly(thioether)triblock copolymer based homogenous DEs with high electromechanical *** triblock copolymer(PSiPGE)was synthesized through the ring-opening polymerization(ROP)of phenyl glycidyl ether(PGE)and carbonyl sulfide(COS)catalyzed by silicon *** dipoles(benzene rings)on the side groups of PSiPGE improved the dipole polarizations and the phase separation structure of this triblock copolymer enhanced the interfacial polarizations between poly(thioether)and polysiloxane,and thus improving the dielectric constant(ε',up to 5.8).In addition,the PSiPGE exhibited low elastic modulus(Y,0.04 MPa),and thus possessed high electromechanical sensitivity(β,~145 MPa^(-1)) which is much higher than that of most homogenous *** work provides a new strategy to construct homogenous DEs with excellent electromechanical performances,leading to a greater application aspect in the actuated devices.

关键词： Poly(thioether)-b-polysiloxane-bpoly(thioether)triblock copolymer Homogenous dielectric elastomer Phase separation Electromechanical performance

A Method to Analyze the Voltage-Actuation Response of a Pre-Strained Circular dielectric elastomer Actuator Model

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Journal of Shanghai Jiaotong university(Science) 2017年第3期22卷 334-342页

作者：陈名光李锦轩福贞 School of Mechanical and Power Engineering East China University of Science and Technology Shanghai 200237China

dielectric elastomers(DEs) are the polymers capable of inducing deformation under electrical stimulation. When subject to a voltage across its thickness, the material reduces in thickness and expands in area. This paper presents a new method to analyze deformation and stress distribution response of the dielectric elastomer actuator(DEA) model under different applied voltage. An equal-biaxial pre-strained circular actuator model was built. The Yeoh strain energy potential and the collocation method are used for describing the large strain actuation response and stress distribution. The study in this paper has shown that: the stress and the stretch distributions in the passive region of the DE actuator depend on the radial distance from the center at the calculation point of the passive region and the magnitude of the applied voltage; with the same excitation applied voltage, we can get a larger deformation actuation by choosing an appropriate pre-stretch ratio; the influence of the non-ideal material has seriously affected the actual deformation of the DE actuators. This analytical model has a reference potential for the design optimization of high performance DEA systems and the model-based control of the DEA robot.

关键词： dielectric elastomer circular actuator Yeoh model actuation

Electrical breakdown of an acrylic dielectric elastomer: effects of hemispherical probing electrode’s size and force

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International Journal of Smart and Nano Materials 2015年第4期6卷 290-303页

作者： Bin Chen Matthias Kollosche Mark Stewart James Busfield Federico Carpi School of Engineering and Materials Science Queen Mary University of LondonLondonUK Materials Division National Physical LaboratoryTeddingtonUK Institute of Physics and Astronomy University of PotsdamPotsdamGermany

dielectric elastomers are widely investigated as soft electromechanically active polymers(EAPs)for actuators,stretch/force sensors,and mechanical energy harvesters to generate *** the performance of such devices is limited by the dielectric strength of the constitutive material,the electrical breakdown of soft elastomers for electromechanical transduction is still scarcely ***,we describe a custom-made setup to measure electrical breakdown of soft EAPs,and we present data for a widely studied acrylic elastomer(VHB 4905 from 3M).The elastomer was electrically stimulated via a planar and a hemispherical metal *** breakdown was characterized under different conditions to investigate the effects of the radius of curvature and applied force of the hemispherical *** a given radius of curvature,the breakdown field increased by about 50% for a nearly 10-fold increase of the applied mechanical stress,while with a given mechanical stress the breakdown field increased by about 20% for an approximately two fold increase of the radius of *** results indicate that the breakdown field is highly dependent on the boundary conditions,suggesting the need for reporting breakdown data always in close association with the measurement *** findings might help future investigations in elucidating the ultimate breakdown mechanism/s of soft elastomers.

关键词： actuator EAP electromechanically active polymer dielectric elastomer dielectric strength electric breakdown hemispherical electrode curvature force

Pulsed actuation avoids failure in dielectric elastomer artificial muscles

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International Journal of Smart and Nano Materials 2014年第4期5卷 217-226页

作者： Toma Kobayashi Stoyan K.Smoukov Department of Materials Science and Metallurgy University of CambridgeCambridgeUK

dielectric elastomer actuators(DEAs)are a class of artificial muscles capable of large linear strains(well over 100%),and with high energy density,and low cost and *** of the most prominent failure modes of a DEA is electrical breakdown,which can damage the device permanently,limiting its deformation *** is also common,since to maximize energy output,devices often operate near the breakdown *** breakdown mechanisms,as well as finding ways to prevent it,are of intense research *** show that by applying short electrical pulses,one could minimize the exposure of the DEAs to high leakage current,which is one of the main mechanisms for electrical *** allows one to operate at significantly higher potentials than the DC breakdown *** applying pulses,we demonstrate up to 81.7%area strain repeatedly,at voltages more than twice the DC breakdown limit,without the risk of *** pulsed operation mode of DEAs accommodating higher voltages than possible with DC represents an opportunity for potential applications,safer and simpler device designs,and a technique for further study of DEA breakdown mechanisms.

关键词： dielectric elastomer electrical breakdown pulsed operation leakage current high voltage design safety

Operational limits of a non-homogeneous dielectric elastomer transducer

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International Journal of Smart and Nano Materials 2017年第4期8卷 214-231页

作者： Anup Teejo Mathew Soo Jin Adrian Koh Department of Mechanical Engineering National University of SingaporeSingaporeSingapore

Operation of a dielectric elastomer(DE)transducer is limited by the way it fails,and any other limits imposed by the *** example,material rupture and dielectric breakdown are two examples of transducer failure,while tension loss is a user-imposed *** instability may or may not result in transducer failure,but is often considered as a boundary to denote the onset of state *** a DE undergoing homogeneous deformation,constructing operational limits on work-conjugate state diagrams are rather ***,for DE subjected to non-homogeneous deformation,the process is more *** present a method to plot the operational boundaries of a DE subject to non-homogeneous deformation,known commonly as the Universal Muscle Actuator or the loudspeaker *** analysis show that tension loss need not be imposed as a hard operational limit,and that there is further operational space for the transducer,post tension *** plotting the operational limits on work-conjugate planes,we determine an optimal inner-to-outer ring ratio and the required pre-stretches that maximize energy conversion.

关键词： dielectric elastomer non-homogeneous operational limits loudspeaker configuration