An energy-based fatigue lifing procedure for the determination of full-life and critical-life of in-service structures subjected to axial isothermal-mechanical fatigue (IMF) has been developed. The foundation of this procedure is the energy-based axial room-temperature fatigue model, which states: the total strain energy density accumulated during both a monotonic fracture event and a fatigue process is the same material property. The energy-based axial IMF lifing framework is composed of the following entities: (1) the development of an axial IMF testing capability; (2) the creation of a testing procedure capable of assessing the strain energy accrued during both a monotonic fracture process and a fatigue process at various elevated temperatures; and (3), the incorporation of the effect of temperature into the axial fatigue lifing model. Both an axial IMF capability and a detailed testing procedure were created. The axial IMF capability was employed in conjunction with the monotonic fracture curve testing procedure to produce fifteen fracture curves at four operating temperatures. The strain energy densities for these fracture curves were compared, leading to the assumption of constant monotonic fracture energy at operating temperatures below the creep activation temperature.
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e-mail: shen.1@osu.edu
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February 2012
Technical Briefs
An Energy-Based Axial Isothermal- Mechanical Fatigue Lifing Procedure
M.-H. Herman Shen,
M.-H. Herman Shen
Department of Mechanical and Aerospace Engineering,
e-mail: shen.1@osu.edu
The Ohio State University
, Columbus, OH 43210
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Charles Cross
Charles Cross
Air Force Research Laboratory
, Wright-Patterson AFB, OH 45433
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M.-H. Herman Shen
Department of Mechanical and Aerospace Engineering,
The Ohio State University
, Columbus, OH 43210e-mail: shen.1@osu.edu
Charles Cross
Air Force Research Laboratory
, Wright-Patterson AFB, OH 45433J. Eng. Gas Turbines Power. Feb 2012, 134(2): 024502 (5 pages)
Published Online: December 14, 2011
Article history
Received:
April 11, 2011
Revised:
May 22, 2011
Online:
December 14, 2011
Published:
December 14, 2011
Citation
Wertz, J., Herman Shen, M., Scott-Emuakpor, O., George, T., and Cross, C. (December 14, 2011). "An Energy-Based Axial Isothermal- Mechanical Fatigue Lifing Procedure." ASME. J. Eng. Gas Turbines Power. February 2012; 134(2): 024502. https://doi.org/10.1115/1.4004394
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