提出了碳纤维为复合结构的观点。根据复合材料力学性能的细观力学分析理论及连续纤维增强的单层板理论，结合碳纤维的微观结构特点，研究了碳纤维实际弹性常数与结晶度、微纤维取向、孔隙状态等的关系，得到了分析方法和计算方法，找出了影响弹性常数的主要因素，给出了理论分析方法和确定的计算公式。理论计算值与实验结果具有良好的一致性。揭示出孔隙密度、微纤维尺寸、微纤维取向、结晶度等对碳纤维弹性常数的决定关系，为碳纤维生产工艺的改进提供了理论依据。
A point of view that the carbon fiber has composite structure is proposed. The relationship between the practical elasticity coefficient of carbon fiber and the crystallinity, micro-fiber orientation and pore conditions was researched based on the micro mechanics theory for mechanical properties of composite materials, the continuous fiber reinforced single plate principle and the properties of microstructure of carbon fiber. The analyzing and calculating methods were obtained, and the main factors which affect the elasticity coefficient were found. A innovative theoretical analysis method and the definite calculation formula were given. The obtained theoretical results are consistent with the experimental results. It is revealed that the pore density, the fiber size and orientation, the crystallinity determine the elasticity coefficient of carbon fiber, which provides theoretical basis to improve the carbon fiber production process.
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