增压器涡轮叶片疲劳蠕变寿命预测方法

根据径流式增压器涡轮的结构与工作特点，分析了涡轮叶片的载荷与应力空间分布特征；针对增压器涡轮由疲劳与蠕变交互作用引起的叶根断裂失效模式，研究了增压器涡轮叶片叶根的载荷与应力变化历程，建立了涡轮叶片叶根的载荷与应力描述方法；然后建立了增压器涡轮叶片叶根疲劳蠕变寿命预测方法及模型，并运用建立的模型对增压器涡轮叶片叶根进行了寿命评估。

Fatigue and Creep Life Prediction Method of Turbine Blades for Turbocharger

According to the structural characteristics and operation profiles of radial turbines, the spatial distribution characteristics of load and stress of turbine blades were analyzed. For the failure mode of blade root fracture caused by fatigue and creep, the loadings and stress processes of blade roots of turbines were studied, and the methods for describing the load and stress of turbine blade roots were developed. Then, the life prediction methods of turbine blade root of turbochargers were studied and the life prediction model of turbine blade roots with the failure mode of fatigue and creep was derived. Finally, taking the turbine of turbocharger for automobile diesel engine, the model built was applied to analyze the life of turbine blade roots of turbocharger for vehicle applications.