| Citation: | LIU Xiaogang, YU Shengji, XU Lei. Fatigue life prediction of electron beam welding joint of superalloy[J]. Journal of Aerospace Power, 2023, 38（5）：1210-1216 doi: 10.13224/j.cnki.jasp.20210542
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In order to study the prediction method of notch fatigue life of GH4169 electron beam welded joints, the fatigue tests of notched specimens were designed and carried out. Based on the critical distance theory, the fatigue life prediction method for different notch shapes of electron beam welded joints was proposed. The nominal stress-life curves of three notched specimens of GH4169 electron beam welded joints (U type, V-1 type and V-2 type) were obtained through tests. Based on the test results of V-2 notched parts, an inverse method of critical distance was proposed to determine the characteristic dimensions of GH4169 electron beam welding notched joints. The fatigue life of notched joints was predicted by the critical distance point method and the line method, respectively. The results showed that the critical distance point method had better adaptability to the notched joints. Further analysis showed that for different notch shapes, when the theoretical stress concentration coefficients were similar, better life prediction results can be obtained by using the same characteristic size in the double dispersion zone.
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