Optimization Design Method of Interference Fit Amount for Assembly Interface Contact Performance

In aero-engines, the main shaft and sleeve are assembled using an interference fit, where the contact stress distribution and effective contact area of the contact interface directly impact the mechanical properties of the interference fit. This paper presents an interference optimization design method to improve the contact performance of the assembly interface and address the stress concentration issue in the contact area. This paper presents a design case of the interference fit assembly structure for the shaft and sleeve in aircraft engines. By actively designing the interference amount while considering the cold assembly process, it effectively addresses the issue of stress concentration on the contact surfaces. The objectives of the design include reducing the maximum stress value at the interference fit contact interface, minimizing the variance of contact stress, and maximizing the effective contact area ratio. These design considerations aim to enhance the performance of the interference fit assembly contact interface.