【摘要】 为研究装配参数对2.5D机织复合材料连接性能的影响，制备了具有不同宽径比w/D与边径比e/D的2.5D机织复合材料试样，通过双搭接拉伸实验，分析了在连接载荷下材料的力学行为与失效模式，并借助微计算机断层扫描技术（Micro-CT）观察试样内部损伤情况，阐明其损伤机制。结果表明：试样在w/D和e/D分别取6和3时，表现出较高的力学性能，但适当减少w/D或e/D依旧能保有相当强度，当w/D下降为4时，刚度减少3.18%，极限挤压强度减少2.77%；当e/D下降为2.5时，刚度与强度分别减少1.62%和7.19%；螺栓孔的位置参数对材料的失效模式影响显著，减小w/D使经纱承受更多载荷，失效模式向净张力失效演变；减小e/D使纬纱承受更多载荷，失效模式向撕裂失效演变。更多还原

【Abstract】 In order to clarify the influence of assembly parameters on the connection performance of 2.5D woven composite materials, specimens with different width-to-diameter ratios(w/D) and edge-to-diameter ratios(e/D) were prepared. The mechanical behavior and failure modes of the materials under double-lap tensile loads were analyzed, and the internal damage of the specimens was visualized using Micro-CT technology to elucidate the damage mechanism. The results showed that the composites could obtain higher mechanical properties when the hole was made with w/D of 6 and e/D of 3. However, reducing w/D or e/D appropriately could still maintain comparable strength. When w/D decreased to 4, the material decreased of 3.18% in stiffness and 2.77% in ultimate compressive strength. And the material decreased of 1.62% in stiffness and 7.19% in strength when e/D decreased to 2.5. The location parameters of the bolt hole would affect the failure mode of the material. Reducing w/D made the warp yarn bear more load and the failure mode evolved towards net-tension failure, while reducing e/D made the weft yarn bear more load and the failure mode evolved towards tearing failure.更多还原