轻质钛铝(TiAl)涡轮能够显著提高涡轮增压发动机的动力性能,而 TiAl 涡轮与 K418 过渡体之间的过盈连接失效问题对增压器安全运行有重要影响.考虑了 TiAl 涡轮和 K418 过渡体材料非线性、损伤准则,建立了TiAl涡轮过盈连接强度有限元模型,通过拉伸试验验证了该模型的准确性.在此基础上,构建了接触应力与摩擦系数的关系公式,并探索了温度和高温条件下转速对 TiAl 涡轮过盈连接强度的影响.结果表明:在 400～700℃时,随着温度上升,结构过盈界面接触应力衰减呈上升趋势,过盈连接强度下降幅度增加;在高温条件下,转速越大,过盈连接强度下降幅度越大.
Bonding Strength of Interference Connection for Supercharger TiAl Turbine
Lightweight titanium-aluminum(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 im-portant 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 be-tween 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 de-crease of interference connection strength increases between 400℃ and 700℃.At high temperatures,the higher the speed,the greater the decrease in interference connection strength.
万方数据
维普
