The mesoscopic scale FEM simulation of dielectric properties of composite material based on montecarlo

In this paper we have studied the dielectric properties of electric field grading non-linear composites through computer simulation. We modeled the composite material on a mesoscopic scale by distributing the filler particles in the matrix through pseudo-random number generated by programming in MATLAB and carried out Monte Carlo (MC) simulation. Time-domain least square method was adopted to decompose the total current from simulation then the macro dielectric parameters of material were obtained. The results show that the amplitude and phase of the response currents of composites with filler particles distributed randomly is different which indicates that composites with same dielectric properties filler have different response. Point estimation and interval estimation are respectively adopted to evaluate the coefficients in mathematical model of the dielectric parameters of the MC simulation results, expectations and ranges of the equivalent conductivity under AC and relative permittivity is given. The simulation method for dielectric properties of composites is improved.