(1. Institute of Electrostatic and Electromagnetic Protection, Ordnance Engineering College, Shijiazhuang Hebei 050003, China;2. The 33rd Institute, China Electronics Technology Group Corporation, Taiyuan Shanxi 030006, China)
The permittivity of carbon fibers in different composites is calculated and discussed by using M-G equations, Bruggeman equations and generalized M-G equation. Results show that for high draw ratio fibers, all the three equations can calculate out the permittivity with the same numerical level and variation trend. Generalized M-G equation and M-G equation have a similar result but Bruggeman''s result is smaller. All three equations become invalidation when fibers'' concentration reaches its percolation threshold, which means that all three equations are useful at low concentration.
QIN Si-liang, WANG Qing-guo, QU Zhao-ming, LEI Yi-san. Calculation on permittivity of carbon fiber based on effective medium theory[J]. Journal of Hebei University of Science and Technology,2012,33(4):309-312Copy