Based On The Research And Finite Element Analysis Of The Electrical Properties Of The Cylindrical Dielectric High Elastic Body Driver

Dielectric elastomer is a novel category of electroactive polymers which were shown to provide excellent overall performances,such as large elongation,high energy density,high responsibility and exceptional efficiency.Electroactive polymers transform electric energy directly into mechanical energy and provide large strains.In particular,when large deformations are required,the materials can be utilized as actuators in adaptive structures,such as optics,robotics,electric generators,prosthetic devices.But for specific materials,these characteristics also need to be determined through experimental methods.Before studying the electromechanical properties of elastomers,I designed and carried out the following experiments:tensile test,fatigue test,stress relaxation experiment.The results of these experiments not only show the excellent physical properties but also to apply the basis for the production of elastomer actuators.When dielectric elastomer is used as actuator,an elastomer is sandwiched between two compliant electrodes.The electrodes are made by coating carbon grease on the two surfaces of the membrane.When the voltage is applied between the compliant electrodes,the Maxwell stress resulting from electric field between two electrodes stretches the elastomer membrane.The size of elastomer membrane decreases in thickness and increases in plane area.In addition,when the fibers are embedded in dielectric elastomer actuators,the performance of the actuators will be promoted observably and anisotropically.Due to the restriction of fiber,the deformation of the parallel fiber direction elastomer is suppressed,and the deformation of perpendicular to the fiber is improved.Based on this principle,I design and manufacture a fiber reinforced cylindrical elastomer actuator,and illustrate the electromechanical properties of cylindrical elastomer actuator and improve the application of elastomeric material through electromechanical experiment.A constitutive model is proposed in this work for finite element modeling and simulation of dielectric elastomer actuators of cylindrical shape.The Mooney-Rivlin strain energy potential is used for describing the large strain mechanical response of the dielectric elastomer.Electromechanical tests under different dead load levels were simulated by MSC.MARC.The results verify applicability of the Mooney-Rivlin model.