Effect of Bolt Number on Joint Stiffness of Disc and Drum Connected by Bolted Joints

摘要

The disc-drum type rotors are widely used in large turbofan engines, where the drums are connected the adjacent disks with the bolted joints. In this paper, the joint stiffness characteristics of a disc-drum structure are investigated based on the finite element model. Firstly, the nonlinear finite element model for the disc-drum structure is established, where the connecting bolts are modelled and the frictional contact of the joint components is also considered. Then, the variation of joint stiffness of the disc-drum structure with the bolt number subjected to external axial force and bending moment are studied respectively. The works proposed in this paper is helpful to enhance the understanding of the joint stiffness properties of the disc-drum type rotor.