Fatigue Crack Initiation and Small Crack Propagation Behaviors of Simulated Specimens in a Ni-Based Superalloy
Year: 2025
Type: article
Abstract: The role of notch geometry and stress levels on fatigue crack initiation and small crack propagation behavior in the FGH96 superalloy was investigated using groove and bolt hole simulated specimens at 500 °C. The findings indicate that the fatigue crack initiation mechanisms and the number of cracks are significantly affected by stress levels. The fatigue crack initiation life and its contribution to the total fatigue lives were analyzed for both specimen types. Notch geometry was found to have a more pronounced effect on crack propagation life than on initiation life under high applied stress. The smaller notch root radius could accelerate the occurrence of crack coalescence, thereby shortening the propagation life. These results are valuable for optimizing the fatigue damage tolerance design of FGH96 turbine discs.
Source: Metals
DOI: 10.3390/met15090933
Authors: Zuopeng Zhao, Xuteng Hu, Zhiwei Guo
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,137
OpenAlex ID: W4413428158