Effective Anisotropic Dielectric Properties of Crystal Composites

Transformation fieM method （TFM） is developed to estimate the anisotropic dielectric properties of crystal composites having arbitrary shapes and dielectric properties of crystal inclusions, whose principal dielectric axis are different from those of anisotropic crystal matrix. The complicated boundary-value problem caused by inclusion shapes is circumvented by introducing a transformation electric field into the crystal composites regions, and the effective anisotropic dielectric responses are formulated in terms of the transformation field. Furthermore, the numerical results show that the effective anisotropie dielectric responses of crystal composites periodically vary as a function of the rotating angle between the principal dielectric axes of inclusion and matrix crystal materials. It is found that at larger inclusion volume fraction the inclusion shapes induce profound effect on the effective anisotropic dielectric responses.     

竹/塑复合材料力学性能评定及其应用

<正> 复合材料从利用天然材料到利用人工材料,从原始经验到高技术的发展,标志了材料发展史上,从第一代利用天然材料的复合材料到第四代先进复合材料的进程。先进复合材料性能优越,但高性能的碳纤维、芳纶纤维等造价高,影响了广泛应用。利用天然纤维采用新的复合工艺,制成性能良好而又价廉的复合材料,将是广泛应用于生产、生活的材料新品种。