基于临界面法的微动疲劳寿命预测工程应用研究

Study on Engineering Application of Fretting Fatigue Life Prediction Based on Critical Surface Method

为研究可应用于工程实际的微动疲劳寿命预测方法,通过对压气机材料TC11微动疲劳试样进行微动疲劳寿命预测分析,梳理了基于临界面法的微动疲劳寿命预测方法的基本流程,并将SWT微动损伤参数的预测结果与试验数据进行对比。结果表明:弧度较小的榫头工作面会使得榫连接模拟件接触区域的SWT临界面参数值降低,有利于提高微动疲劳寿命;基于SWT临界面参数的寿命模型的预测结果与试验值的误差分散带在2倍因子以内,对航空发动机和燃气轮机实际构件的微动疲劳寿命预测具有参考意义。

Fretting fatigue life prediction analysis for compressor material TC11 specimens was conducted to study its potential engineering application.The basic flow of fretting fatigue life prediction method based on critical surface method was combed,and the experimental results and prediction results were compared.Results show that the smaller radian of the tenon working surface will reduce the SWT critical interface parameter value of the contact area,which is conducive to the improvement of fretting fatigue life.The error dispersion band between the predicted results based on SWT critical interface parameters and the experimental values is within 2 times of the factor,which has reference significance for the prediction of fretting fatigue life of actual components of aeroengines and gas turbines.