【摘要】 为研究加工误差产生的配合间隙对碳纤维复合材料螺栓接头性能的影响，提出了一种自上而下的多尺度分析方法。首先，建立三维渐进损伤模型，分析接头的宏观力学响应及损伤机制，并将宏观应变传递至代表性体积单元（RVE）模型中，进一步探讨了微观尺度下的裂纹起始与扩展过程。通过5组试验验证了数值模型的准确性。结果表明，间隙量与接头承载强度之间呈非线性关系，且当间隙量为1.56%时，接头的承载强度下降最显著，降幅达到7.9%。此外，间隙配合导致孔壁的应力分布不均匀，进而显著降低接头刚度，在间隙量为3.08%时，接头刚度下降了22.1%。研究还发现，基体裂纹的起始位置主要集中在纤维分布密度较大的区域，而树脂含量较高的区域对裂纹的扩展具有一定抑制作用。研究结果为复合材料螺栓接头的设计与装配提供了重要的理论依据和试验指导。更多还原

【Abstract】 To investigate the effect of clearance induced by manufacturing errors on the performance of carbon fiber composite bolted joints, a top-down multi-scale analysis method was proposed. First, a three-dimensional progressive damage model was established to analyze the macroscopic mechanical response and damage mechanisms of the joint. The macroscopic strain was transferred to the representative volume element(RVE) model, where the crack initiation and propagation process at the microscopic scale were further explored. The accuracy of the numerical model was validated through five sets of experimental data. The results reveal a nonlinear relationship between the clearance amount and joint bearing strength. The bearing strength decreases most significantly when the clearance amount is 1.56%, with a reduction of 7.9%. Moreover, the clearance fit leads to the uneven stress distribution around the hole, which significantly reduces the joint stiffness. When the clearance amount is 3.08%, the joint stiffness decreases by 22.1%. The study also finds that matrix cracks initiate mainly in areas with dense fiber, while regions with high resin content tend to deterring the crack propagation. The results provide valuable theoretical and experimental guidance for the design and assembly of composite bolted joints.更多还原