Numerical Simulation Of Power Generation Performance Of Silicone Rubber Dielectric Elastomer

Dielectric elastomer is a new kind of electroactive functional material with the advantages of low modulus,large strain and high specific energy density.It has broad application foreground in the realm of clean energy collection and is one of the most potential new power generation materials.However,DE has complex mechanical and electrical properties,and its working load has the characteristics of large deformation and electromechanical coupling,which make it hard to construct a physical model that reflecting the deformation state of material.At the same time,the energy losses in the power generation process are also important issues that need to be explored.The purpose of this paper is to explore the electromechanical coupling properties of DE,develop the numerical algorithm of power generation performance of DE and energy loss based on nonlinear viscoelasticity,and provide theoretical guidance for the optimal design of DE and power generation products.The main work of this paper is as follows:(1)Based on the previous research,the principal coordinate form and tensor form of the electromechanical coupling constitutive model of DE were derived,and the failure behaviors and allowable area were numerically analyzed.The mechanism and power generation performance of three power generation cycle patterns were theoretically analyzed.It is found that the constant charge mode is a relatively optimal power generation cycle mode.(2)The UMAT subroutine and PYTHON language were used for the secondary development of ABAQUS software,and the numerical coupling method of force field and electric field of DE was constructed.Combined with the theory of electrostatic energy,the simulation algorithm of power generation performance parameters of silicone rubber DE was established,and the algorithm was verified by experiment.We Simulated the power generation energy density of silicone rubber film under different initial conditions and different tensile modes,and the method of optimizing power generation performance was proposed to guide the optimal design of power generation film and its products.(3)The energy loss behaviors of DEG operation process were studied.We established a nonlinear viscoelastic model under large deformation,and adopted particle swarm algorithm to fit parameters.Then,the reliability of the viscoelastic model and its parameter identification method was verified by experiments.Based on the nonohmic conduction characteristics of DE,the leakage loss model of silicone rubber power generation film and the charge leakage calculation method of retraction power generation process were established.(4)Based with the numerical algorithms of power generation performance parameters and energy dissipation,the energy conversion and dissipation behaviors of silicone rubber in the process of plane stretching power generation were analyzed.The results show that the hysteresis loss and leakage loss of silicone rubber film in a single power generation cycle is relatively small,and it has high electromechanical conversion potential.Compared with the experimental results,the calculated values of each loss energy and power generation energy density have high computational accuracy,which validates the algorithms of the energy of silicone rubber film power generation process.