Research on Experimental Technique for Fatigue-Creep Life of the Turbine Blade in Aeroengine

Turbine blades of aeroengine are one kind of component parts working in the most severe conditions.They have the most complex structure,and are apt to fracture.The turbine blades endure the compound loads at high temperature all the time when the engine is working.Therefore,to determine the working life of the blade,the creep and fatigue life cannot be separately considered.On the contrary,the mutual effects of fatigue and creep must be fully considered.At present the method for predicting the fatigue-creep life of structure is imperfect in theory,so experimental research for the fatigue-creep life of the turbine blade is an important procedure in the design and life determination of the blade.This paper has a general discussion on the technique of fatigue-creep experiment of turbine blade.The determination of the experimental load spectrum and the key technical procedure of designing the testing blade sample are emphasized.This paper also introduces a synthetical testbed,whose loading system is based on the electric-mechanical servo device and which is especially suitable for blade fatigue-creep experiment.