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本文采用单丝反弹测试及扫描电镜观察(SEM)的方法研究了聚丙烯腈(PAN)基和中间相沥青基(MP)炭纤维的压缩特性,PAN—CF与MP—CF相比具有更高的压缩强度。本文从两相结构观点分析讨论了一些PAN—CF的优异抗拉和抗压强度,其中一相是标准的层面结构,另一相是无序碳结构。分析认为,MP—CF抗压强度较低是由于其结构的高度有序性(石墨化)及其固有的片状结构。受压缩CF的SEM显微照片表明纤维断裂的类型取决于纤维的种类。从而提出了两种不同的形变机制,即对PAN—CF来说是与扭曲有关的多弯曲带的形成机制以及对大多数MP—CF来说是与传统的剪切破坏有关的单一弯曲带的形成机制。
In this paper, the compression properties of polyacrylonitrile (PAN) and mesophase pitch (MP) carbon fibers were investigated by monofilament rebound test and scanning electron microscopy (SEM). PAN-CF has higher compression ratio than MP-CF Compressive strength. This paper analyzes and discusses the excellent tensile strength and compressive strength of some PAN-CFs from the perspective of two-phase structure, in which one phase is a standard layered structure and the other is a disordered carbon structure. It is considered that the lower compressive strength of MP-CF is due to its highly ordered (graphitized) structure and its inherent plate-like structure. SEM micrographs of compressed CF indicate that the type of fiber breakage depends on the type of fiber. Thus, two different deformation mechanisms are proposed, namely the formation mechanism of multi-bending bands related to distortion for PAN-CF and the single bending band related to conventional shear failure for most MP-CF Form a mechanism.