摘要：Multistage fatigue tests were conducted on the single-edge-notch tension specimens of Ni-based superalloy GH4169. Fatigue crack growth data at different stages were recorded with the surface replica technique. Continuum damage mechanics incorporating critical distance theory was used to evaluate fatigue crack initiation life. Then, small and long fatigue crack grow rates were modeled using Shyam’s model and modified Paris law, respectively. Finally, the multistage fatigue model deriving from the above theories was proposed to predict total fatigue life of GH4169. Fatigue life prediction results show that the proposed multistage fatigue model has high accuracy for GH4169.
关键词：Multistage fatigue; small fatigue crack; long fatigue crack; life prediction; GH4169
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