Fatigue Life Prediction of Notched Specimen under Multiaxial Cyclic Loading

Abstract:

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.

• Periodical: Advanced Materials Research (Volumes 228-229)
• Pages: 672-675
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.228-229.672
• Online since: April 2011
• Authors: Guo Qin Sun, De Guang Shang
• Keywords: Finite Element Analysis (FEA), Life Prediction, Multiaxial Fatigue, Notch

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