Analysis on axial compression fracture of high strength fibers and their composites

与拉伸强度相比，碳纤维和液晶聚合物纤维的压缩强度相对较低，这阻碍了复合材料优异拉伸性能的最有效利用。在本研究中，建立了单纤维轴向压缩强度和纤维间强度的测量方法。将该方法测得的抗压强度与小角X射线散射法测得的结构特征进行了对比分析。阐明了这些纤维及其复合材料的压缩断裂机理，得到了提高其压缩强度的指导原则。

Carbon fibers and liquid crystal polymer fibers have relatively lower compression strength as compared with the tensile strength, and this hinders the most effective utilization of the excellent tensile properties in composites. In the present study, the methods have been established to measure the single-fiber axial compression strength and interfibrillar strength of the fibers. The compression strength measured with this method has been analyzed in relation to the structure feature measured with small-angle X-ray scattering. The compression fracture mechanisms of these fibers and composites have been elucidated and the guidelines have been obtained for increasing the compression strength.