均匀性连接是保障航空发动机连接部位高性能高可靠性服役的关键，连接界面设计是实现连接部位均匀性连接的创新途径。面向航空发动机中广泛使用的螺栓紧固件，以界面形状设计与刚度设计为技术手段，研究其在改善航空发动机转子螺栓结构连接均匀性中的应用。以连接界面处接触应力分布均匀程度表征连接均匀性，构建了航空发动机转子螺栓结构连接均匀性分析模型，提出了基于应力分布的界面形状与刚度设计方法，开展了面向连接均匀性的航空发动机转子螺栓结构栓接界面形状与刚度设计，分析了螺栓预紧一致性水平对栓接界面设计后的连接均匀性的影响。结果表明，栓接界面形状设计和刚度设计均可增大有效接触面积100%以上、降低接触应力分布方差90%以上，且该结果具有良好的抗螺栓预紧力波动能力，在20%的预紧力波动范围内仍可显著改善航空发动机转子螺栓结构的连接均匀性。望此研究能推动连接界面设计早日成为航空发动机设计制造领域中的成熟工程技术。

Uniform connection is crucial for ensuring the high performance and reliability of connected parts in aero-engines. Connection interface design presents an innovative approach for achieving uniform connection. Focusing on the widely used bolted fasteners in aero-engines, this study investigates the application of interface shape design and stiffness design to improve connection uniformity in aero-engine rotor bolted structures. The uniformity degree of contact stress distribution at the connection interface is used to characterize connection uniformity. An analysis model for the connection uniformity of an aero-engine rotor bolted structure is established. A design method for interface shape and stiffness based on stress distribution is proposed. Subsequently, bolted interface shape and stiffness designs are conducted targeting connection uniformity of the established aero-engine rotor bolted structure. The influence of bolt preload consistency on the achieved connection uniformity post-interface design is further analyzed. The results indicate that both bolted interface shape design and stiffness design can increase the effective contact area by over 100% and reduce the contact stress distribution variance by over 90%. Furthermore, these results demonstrate robust resistance to bolt preload fluctuations, maintaining significant improvement in connection uniformity for the aero-engine rotor bolted structure within a preload fluctuation range of 20%. It is hoped this research will promote connection interface design to become a mature engineering technology in the field of aero-engine design and manufacturing.