An energy based fatigue damage and lifing assessment method is developed for a high temperature material, Inconel 625, and Aluminum 6061-T6. A newly developed experimental method is used for interrogating accumulated fatigue damage and evolution for low and high cycle fatigue (LCF/HCF) at continuum scales. The proposed fatigue lifing assessment method is based on assessing the total strain energy dissipated to cause fatigue failure of a material, known as the fatigue toughness. From the fatigue toughness and experimentally determined fatigue lives at two different stress amplitudes, the cyclic parameters of the Ramberg-Osgood constitutive equation that describes the hysteresis stress-strain loop of a cycle are determined. Stress controlled mechanical fatigue tests are performed to construct room temperature stress-life (S-N) curves and to determine damage progression based on accumulated fatigue damage. The predicted fatigue life obtained from the present energy based approach is found in good agreement with experimental data.
Development of a Fatigue Damage and Lifing Assessment Method for Inconel 625 and Aluminum 6061-T6
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Celli, D, Shen, MH, George, T, Scott-Emuakpor, O, & Holycross, C. "Development of a Fatigue Damage and Lifing Assessment Method for Inconel 625 and Aluminum 6061-T6." Proceedings of the ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. Volume 7A: Structures and Dynamics. Charlotte, North Carolina, USA. June 26–30, 2017. V07AT31A006. ASME. https://doi.org/10.1115/GT2017-63775
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