Experimental and numerical studies on the bending properties of three-dimensional full five-directional (3DF5D) braided composites are presented in this article. Three-point bending tests of the braided specimens with different braiding angles were first preformed. Then, the full-scale specimen model was constructed and a strength analysis method based on repeated unit-cell (RUC) model was established to describe the strength characteristics of the 3DF5D braided composites. The differences between yarn configurations in corner, surface and interior RUCs were considered and continuum damage models were introduced into the components such as yarns and matrix of the RUCs in the method. This linked the macroscopic nonlinear response with the damages in the microstructures. Good agreements were achieved in the load-deflection curves and damage morphology between experimental and numerical results. 

本文对三维全五向（3DF5D）编织复合材料的弯曲特性进行了实验和数值研究。 首先对不同编织角度的编织试件进行三点弯曲试验。 然后，建立了全尺寸的试件模型，并建立了基于重复单元格（RUC）模型的强度分析方法，以描述3DF5D编织复合材料的强度特性。 考虑了角，表面和内部RUC中纱线配置之间的差异，并在该方法中将连续损伤模型引入到RUC的纱线和基体等组分中。 这些工作将宏观非线性响应与微观结构的破坏联系在一起。 实验和数值结果在载荷-挠度曲线和损伤形态方面取得了很好的一致性。