| Citation: | KE Zhenrui, SHANG Yibo, LI Bin, et al. Fatigue limit evaluation of repaired blades based on the theory of critical distance[J]. Journal of Aerospace Power, 2025, 40（10）：20230665 doi: 10.13224/j.cnki.jasp.20230665
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Foreign object damage is an important factor affecting the service of aeroengine fan and compressor blades. Small foreign object damaged notch can be typically repaired by machining or polishing. To evaluate the fatigue properties of the machined and polished blades, the high-cycle fatigue strength of the machined and polished blades was tested, and the fatigue limit prediction model was built based on the theory of critical distance, and compared with the classical Peterson model. The influences of different stress selection methods on the accuracy of the model were analyzed. The results showed that the model based on the theory of critical distance can accurately predict the fatigue limit of repaired notched blades, including a variety of repair processes, such as machining and polishing. There was little difference between the prediction using the maximum absolute value of the principal stress and the normal stress along the blade length. The model accuracy from theory of critical distance (average error less than 11%) was much higher than the classical Peterson’s model (average error 26.03%).
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