基于径向模量分布表征的国产碳纤维离散性研究

碳纤维是航空航天、军事工业以及众多民用领域中应用广泛的国防战略材料之一，是实现各种飞行器轻量化的最重要手段。然而国产碳纤维领域长期受到离散性问题的困扰，如何从宏观力学性能及尺寸形貌等表观离散现象出发，确定离散性的微观机理是解决这一问题的关键环节。本项目拟在前期针对日本东丽碳纤维研究的基础上，采用自主开发并得到充分验证的径向剖析法，以纤维单丝横截面内径向模量分布测量为切入点，量化表征纤维内部典型离散结构的微观特征、种类及其分布规律，进而通过有限元分析、数值拟合等方法建立上述微观因素与单丝力学性能、束丝力学性能等宏观物理量离散性之间的对应关系。最终揭示宏观离散现象产生的微观机理，确定影响纤维性能的核心因素，为工艺优化提供目标与理论支撑，为加速国产碳纤维产业的发展做出贡献。

Carbon fiber is an important material widely used in aerospace, military and civil industries, and is the most efficient method to realize lightweight structures for aircrafts. However, domestic carbon fibers have suffered from the mechanical property scattering for a long period of time. To address the problem, it is critical to determine the mechanism of scattering from the microscopic point of view. In the project, a custom developed method, named as radius profiling, will be used to measure the radius distribution of the modulus for carbon fiber monofilaments. From the distribution, typical discrete structures will be identified together with their properties, quantities and positions. Next, the mechanical properties of the monofilament and bundles will be measured subsequently. Finally, the correlations between the typical discrete structures and the macroscopic mechanical behavior will be established via finite element analysis and numerical fitting. The work will help to figure out the mechanism behand the discrete behavior of domestic carbon fibers, and will contribute to the development of domestic carbon fiber industry.