Fatigue Life Prediction of Notched Specimen under Multiaxial Cyclic Loading
The stress-strain response at notch root for notched specimen was computed by elastic-plastic finite element analysis (FEA) under multiaxial loading for GH4169. A uniform gouge length of the specimen was selected as the dimension of the FE model. The uniaxial fatigue data were used to describe the stress-strain curve. One cycle is divided to different load steps according to phase difference. Tension-torsion strain cyclic loading was implemented in FEA. Fatigue crack initiation life was predicted by Smith-Watson-Topper model, Shang-Wang and Sun-Shang models with the calculated stress-strain data at notch root. The result shows that the three models are suitable for life prediction of notched specimen under multiaxial cyclic loading for GH4169 alloy.
G. Q. Sun and D. G. Shang, "Fatigue Life Prediction of Notched Specimen under Multiaxial Cyclic Loading", Advanced Materials Research, Vols. 228-229, pp. 672-675, 2011