Study on high-low cycle fretting fatigue life of Inconel718 tenon structure
The turbine blades of aero-engines are subjected to cyclic high-low cycle loads in actual service environ-ments,which is a typical high-low cycle micro motion fatigue condition.The frequent occurrence of fatigue fracture in turbine blades due to fretting fatigue seriously affects the safe operation of aero-engines.In order to study the high-low cycle fretting fatigue problems of hot end component materials,this paper designs an Inconel718 tenon connection simulation component and conducts high-low cycle composite fretting fatigue tests on it.Three different load/frequency experiment conditions were designed to compare the life distribution of the simulated parts under dif-ferent conditions.The results show that high/low cycle load has significant influence on fretting fatigue life.With the increase of high/low cycle load or frequency,the fretting fatigue life of joints decreases.The test results have proven that the high-low cycle fretting fatigue test of the tenon joint structure effectively reproduces the actual ser-vice condition of turbine blades.By displaying the explicit finite element analysis,the predicted crack initiation loca-tion shows less dispersion compared to the experimental results.
Inconel718high-low cycle loadhigh-low cycle frequencyfretting fatiguefatigue life
万方数据
维普
