The longitudinal tensile experiments of cut-edge effect on the mechanical performance of three-dimensional full five-directional (3DF5D) braided composites were conducted. The specimens involved two different braiding angles and two different cutting ways. Fracture appearance of specimens without cut-edge and cutting along width direction presented flush，while explosive for specimen with cut-edge along thickness direction. The fracture of axis yarns mainly contributed to the damage of specimens. Cut-edge had little influence on the stiffness of 3DF5D braided composites and had approximately 20 % reduction in tensile strength compared with specimens without cut-edge. The periodic boundary conditions under cut-edge and uncut-edge situations were applied to the RVC to simulate the mesoscopic damage mechanism using finite element method. The stress–strain curves and damage evolution nephogram were obtained. The variation of cut-edge effect with the number of inner cells was predicted by superimposing inner cells method, the addition of inner cells could strengthen the performance of 3DF5D braided composites with cut-edge. These results will play an important role in evaluating the mechanical properties of braided materials after cutting.

对三维全五向（3DF5D）编织复合材料力学性能的切边效应进行了纵向拉伸实验。试件涉及两种不同的编织角度和两种不同的切边方式。没有切边和沿宽度方向切边的试样的断裂呈断口齐平现象，而对于沿厚度方向的切边的试件的断口则呈现爆炸形状。轴纱的断裂是造成试件损坏的主因。与无切边的试件相比，切边对3DF5D编织复合材料的刚度影响不大，但拉伸强度降低了约20％。将切边和非切边情况下的周期性边界条件应用到RVC中，以有限元方法模拟其细观损伤机理。获得了应力-应变曲线和损伤演化云图。通过叠加内部单元法预测了切边效应随内部单元数的变化，增加内部单元数量可以增强具有切边的3DF5D编织复合材料的性能。这些结果在评估编织材料切割后的力学性能时将发挥重要作用。（本文证明了切边对三维全五向编织复合材料的影响相比对三维四向编织复合材料影响小的多，对于表面经过机械加工切割或者表面经过烧蚀的三维编织复合材料的应用具有一定指导意义）