针对航空用C/C和C/A叠层复合材料连接件的材料特性和结构特点，以连接装配孔为研究对象，开展复合材料连接孔的抗疲劳性能研究，建立抗疲劳性能与制孔精度、质量之间的关联模型；然后通过制孔工艺优化，获得具有高一致性、稳定制孔精度和孔壁质量的批量孔加工工艺；最后针对C/C和C/A叠层特征部件机械连接，开展连接强度和疲劳寿命试验和有限元仿真分析，提出制孔工艺与机械连接的匹配优化方案，以期实现C/C和C/A叠层复合材料连接件的高效精密装配。本项目的研究成果可为复合材料构件的抗疲劳精密制孔工艺提供理论指导和技术支持，为先进航空复合材料结构的制造和应用提供技术保障。

In this project, the anti-fatigue properties of the assembly holes will be investigated according to the mechanical and structure characteristics of C/C and C/A stack composite joints. The main research work of the project is as follows: Firstly, the connection and fatigue properties for CFRP composite connection holes will be studied, and then the correlation model between the anti-fatigue performance and hole quality will be built; Secondly, the process schemes for batch hole machining with good consistency of high hole accuracy and hole-wall quality will be obtained by the optimization of hole machining process; Finally, experiments and finite element simulation analysis will be carried out on the connection strength and fatigue life of typical aircraft parts with C/C and C/A stacking features, and then the matching optimization scheme of hole machining process and fastened methods will be obtained to achieve high efficiency and precision assembly on C/C and C/A stack composite parts. The research results of this project would provide a theoretical guidance and technical support for anti-fatigue precision machining technology of composite components, and also provide a technical support for the manufacturing and application of advanced aviation composite structures.