A Method for Slip-Stick Area Analysis of Contact Surface in Rotor Blades With Friction Damper

Abstract

High cycle fatigue damage caused by resonance can significantly affect the reliability and life of rotor blades in turbomachinery. Dry friction damper is widely used in vibration reduction design of joint components because of its excellent performance. To predict the vibration response of rotor blades with friction damper, it’s necessary to analyze the pressure distribution of contact area and determine the contact state of each point. Most researchers focused on the construction and improvement of friction models, and assumed that only the normal pressure distribution decides where slip and stick areas are, but the shear traction also play a role. In this paper, a novel method is proposed to quantitatively conduct the slip-stick area analysis of contact surface by means of theoretical derivation and numerical simulation. Both the non-dimensional normal pressure and shear traction distribution are obtained for different contact conditions. It is found that both the normal pressure and shear traction of each point dominate its contact state. Moreover, the area at contact edges always begins slipping firstly, even if the normal pressure there is much larger than contact center. The developed method will also help to establish more accurate partial-slip model for various jointed structures with friction damping.