(1.School of Mechanical Engineering,Hebei University of Technology,Tianjin 300130,China;2.Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles,Tianjin 300130,China;3.China North Engine Research Institute(Tianjin),Tianjin 300406,China)
Lightweight titaniumaluminum(TiAl) turbine can significantly improve the power performance of turbocharged engines, but the interference connection between the TiAl turbine and the K418 bushing will produce the failure that has an important impact on the safe operation of supercharger. The material nonlinearity damage criterion of TiAl turbine and K418 bushing was studied, a finite element model of structural strength for the interference connection between TiAl turbine and K418 bushing was established, and the accuracy of model was verified through tensile test. Then the relationship formula between contact stress and friction coefficient was constructed, and the influence of temperature and rotational speed on the strength of TiAl turbine interference joint under high temperature conditions was explored. The results show that the contact stress attenuation at the structural interference interface shows an upward trend with the increase of temperature and the decrease of interference connection strength increases between 400 ℃and 700 ℃.At high temperatures, the higher the speed, the greater the decrease in interference connection strength.
