聚丙烯腈基炭纤维对比分析:(二)结构与性能的关联性

A comparative analysis of polyacrylonitrile-based carbon fibers:(Ⅱ)Relationship between the microstructures and properties

以典型聚丙烯腈基炭纤维为研究对象,结合弹性解皱模型、Griffith微裂纹理论等探讨了炭纤维的力学性能与微观结构的关联性。分别分析了微晶结构及其择优取向对拉伸模量、孔结构及质量密度起伏对拉伸强度、内部残余压缩应力对断裂伸长率的影响关系,确认了上述对炭纤维力学性能起关键影响作用的结构因素,并据此探讨了炭纤维的拉伸断裂机制。

The relationships between the mechanical properties and the microstructures of typical polyacrylonitrile-based carbon fibers were studied on the basis of the elastic wrinkle model and Griffith microcrack theory.The effects of microcrystallite structure and its preferred orientation on tensile modulus,the effects of microvoids and mass density changes on the tensile strength,and the effects of internal residual compressive stress on the strain to failure,were analyzed,based on which the structural factors played a key role in determining the mechanical properties of the fibers.