碳纤维结构排布对其辐射特性影响的分析

为了研究碳纤维的光谱辐射特性，利用时域有限差分法模拟计算了不同排布方式下的碳纤维辐射特性。结果表明：在2D随机排布方式下等半径碳纤维散射因子随着碳纤维含量的降低而减小，当含量降低17.12%，散射因子的最大值降低35%；在2D随机排布方式下非等半径碳纤维，不仅碳纤维含量对材料辐射特性有影响，碳纤维圆柱体的半径也影响其辐射特性，在2.5～3.5 μm波段同含量下碳纤维根数由26增加至56时散射因子增大20%；而且碳纤维3D随机排布方式和2D随机排布的辐射特性偏差较大，2D排布模型代替3D随机排布模型会使碳纤维吸收截面偏差40%。

Analysis of influence of carbon fiber structure arrangement on its radiation characteristics

In order to study the spectral radiation characteristics of carbon fiber, the finite difference time-domain method is used to investigate the radiation characteristics of carbon fiber in different configurations. The results show that the scattering factor of carbon fiber with the same radius in 2D random distribution decreases with the decrease in content of carbon fiber. When the content decreased by 17.12%, the maximum value of the scattering factor is decreased by 35%. Under the 2D random distribution of non-uniform radius carbon fiber, besides of the influence of carbon fiber content on the material’s radiation characteristics, the number of carbon fiber particles with small radius under the same content will increase the scattering factor by 20% in the 2.5—3.5 μm band. Compared with 2D random arrangement, 3D random arrangement can significantly enhance the radiation characteristics of carbon fiber.