Adhesive bonding is usually used to fabricate composite structures that are hard to manufacture in one piece, however, their lightweight advantage is usually impaired by low failure strength. For high performance composite structures, bonding properties of joints dominate the failure performance and commonly are the primary target of structural optimization. Both experimental and numerical studies of failure behavior of single-lap joints with three-dimensional braided composite laminate adherends are presented in this paper. First, tensile failure tests were performed on braidlaminates single-lap joints bonded with epoxy resin. Compared with the laminates–laminates single-lap joints, the failure load of the braid–laminates single-lap joints increased by 18.4%. Then, the Finite Element Method (FEM) coupled with cohesive zone models (CZM), considering different value of overlap length (L), was used to perform the detail stress distribution of the overlap sections of SLJs. Further, damage initialization and crack growth of single-lap joints are analyzed in detail to fully characterize the failure process, and both experimental and numerical results lead to the same conclusion. Lastly, the effect of three-dimensional braided adherends’ braiding angle on braid-laminates single-lap joints’ performance was investigated, which provides suggestions for the design and optimization for adhesive bonded composite structures.

胶接通常用于制作难以整体制造的复合材料结构，但是，其减重优势通常会因较低的破坏强度而受到损害。对于高性能复合材料结构，接头的粘结性能支配着失效性能，通常是结构优化的主要目标。本文对三维编织复合材料板与层板单搭接头的失效行为进行了实验和数值研究。首先，对与环氧树脂粘合的编织板与层板单搭接头进行拉伸破坏测试。与层板-层板单搭接头相比，编织板-层板单搭接头的破坏载荷增加了18.4％。然后，考虑了重叠长度（L）的不同值，结合有限元方法（FEM）和内聚力区域模型（CZM）来进行SLJs重叠部分的细节应力分布。此外，详细分析了单搭接头的损伤初始化和裂纹扩展，以充分表征破坏过程，而实验和数值结果均得出相同的结论。最后，研究了三维编织板的编织角度对编织板-层板单搭接头性能的影响，为胶粘复合结构的设计和优化提供了建议。本文是三维编织的填料的应用的后续研究。