非連続炭素繊維強化ポリアミド 6 における X 線回折像に基づく繊維配向状態指標と引張特性との関係

抄録

The fiber orientation state in carbon fiber reinforced polyamide 6 composites was expressed by an order parameter (S₂) that is used to express the orientation state of Nematic Liquid Crystal. S₂ was derived from the X-ray diffraction image of the composites that reflects the fiber orientation distribution. As the specimens, composites of various fiber content were prepared and, regardless of the content, S₂ and their tensile properties showed positive correlation. Furthermore, we predicted the relation between the fiber content and tensile modulus in the case of the quasi-isotropic composites used by the measured tensile modulus and S₂ to compare with those calculated by the modified Halpin-Tsai model that takes into account the fiber length distribution of the specimens. Because of the similarity between the results derived from the different methods, it was found that S₂ is a useful index that represents the condition of fiber orientation in the fiber reinforced composite materials.