Coexistence States Of Dielectric Elastomer Membrane

Soft material, which will be stimulated to deform and the deformation will cause the corresponding function, are called active soft materials. In this decade, dielectric elastomer has grabbed extensive attention in academy and industry, it produces infinite expectations for people and more and more academic research has been conducted on it. Dielectric high-elastic polymer can be processed into converter which is widely used in scientific research, including flexible robot, intelligent optical devices, Braille displays, generators, etc., and has large strain, fast response, higher energy efficiency and many other excellent mechanical properties. The core part is a dielectric elastomer film whose upper and lower surfaces attached by flexible electrode. Under voltage, the film thickness decreases while area increases, thus achieving conversion between electric energy and mechanical energy. This kind of deformation is nonlinear large deformation, but when dielectric elastomer is subjected to applied load and voltage, it will be electromechanical phase transition. Dielectric elastomer film maybe deform into a mixture of two regions under certain condition, under one condition, the film is thick but small, this area is called flat region; while under another condition, the film is thin and large, this area is called wrinkle region. However, the two areas can coexist under certain condition. So part of the film are in flat region, others are in wrinkle region. The flat region constrains the wrinkle region, resulting in the wrinkle region becoming wrinkle with a larger area. On this basis, the processes of electromechanical phase transition under various conditions are discussed. We give the stable conditions of two states coexistence and determine the allowed states when elastomer membrane works. The results show that the occurrence of wrinkle regions makes a large increase in the conversion between electric energy and mechanical energy. The contents of this paper include(1) This paper establishes the in-plane uniform large deformation mathematical model of circular dielectric elastomer film under the applied electric field and the outer lower uses deformable dielectric nonlinear field theory, combines thermodynamic analysis method, then we has got the elastomeric film plane uniformity of large deformation equations, next by solving equations to obtain the applied voltage, external loads and elastomeric film radial stretch ratio curve relationship between variables. Researching on this part provides a theoretical support of the analysis of several elastic membrane electric phase transformation.(2) Based on the above research work, we can see when the elastomeric film in subject to certain applied voltage and external load, the film will be differentiated into two different degrees of deformation regions, namely electrical power phase change film. Using of nonlinear elastic large deformation theory, combining with state and thermodynamic equilibrium, we has derived the equations describe the state of the film coexist, and solved the critical loading conditions for films electrical power phase change, given the applied voltage, external load, radial stretch ratio of film and charge density curves. It paves the way for subsequent discussion of mechanical energy and electric energy conversion efficiency and the working load range of elastomer membrane.(3) The paper takes a helpful discussion and research on the dielectric elastomer film mechanical energy and electric energy conversion and its normal work load interval. Dielectric elastomer actuator converts electrical energy into mechanical energy, achieves actuation functions, on the contrary, dielectric elastomer energy collector converts the mechanical energy into electrical energy to achieve power generation function. This article discusses a reversible dielectric elastomer film experience power phase transition energy conversion cycle, using deformable dielectric nonlinear field theory, combining thermodynamic analysis, has established a more reasonable model for film elastomer energy conversion cycle studies. In this paper, we present the effective operating range of the elastomeric film under the force of phase transition, such that So that the elastomer film energy conversion efficiency has an impressive promotion compared to only through Uniform deformation, and then the dielectric elastomer converter achieves the most efficient work.