【摘要】：通過循環(huán)應力-應變方程和應變-壽命方程推導了可預測材料高、低周疲勞壽命的非線性疲勞損傷累積模型。模型中引入彈性、塑性加權應變因子對疲勞延性指數(shù)和疲勞強度指數(shù)進行修正,以考慮疲勞過程中彈塑性應變共同作用對疲勞損傷累積速率的影響。以某型航空發(fā)動機壓氣機葉片為研究對象,利用所建立的模型預測其疲勞壽命,并與試驗結果、Basquin方程、改進的Basquin方程的預測結果進行對比分析。結果發(fā)現(xiàn):在低應力水平(≤700MPa)下,三種預測模型給出的高周疲勞壽命誤差小于30%;但是當應力水平達到770MPa時,所建立模型的預測精度比Basquin方程和改進的Basquin方程分別提高89.14%和22.73%。
[Abstract]:Through cyclic stress-strain equation and strain-life equation, a nonlinear fatigue damage accumulation model for high and low cycle fatigue life of predictable materials is derived. In the model, elastic and plastic weighted strain factors are introduced to modify fatigue ductility index and fatigue strength index to consider the effect of elastic-plastic strain interaction on fatigue damage accumulation rate. The fatigue life of a certain aeroengine compressor blade was predicted by using the established model, and the results were compared with the experimental results and the modified Basquin equation. The results show that under low stress level (鈮，

本文編號：2240409