基于加权应变因子的叶片振动疲劳寿命预测
发布时间：2018-09-13 06:55
【摘要】：通过循环应力-应变方程和应变-寿命方程推导了可预测材料高、低周疲劳寿命的非线性疲劳损伤累积模型。模型中引入弹性、塑性加权应变因子对疲劳延性指数和疲劳强度指数进行修正,以考虑疲劳过程中弹塑性应变共同作用对疲劳损伤累积速率的影响。以某型航空发动机压气机叶片为研究对象,利用所建立的模型预测其疲劳寿命,并与试验结果、Basquin方程、改进的Basquin方程的预测结果进行对比分析。结果发现:在低应力水平(≤700MPa)下,三种预测模型给出的高周疲劳寿命误差小于30%;但是当应力水平达到770MPa时,所建立模型的预测精度比Basquin方程和改进的Basquin方程分别提高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，
本文编号：2240409
[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，
本文编号：2240409
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