The energy-based lifing method is based on the theory that the cumulative energy in all hysteresis loops of a specimens’ lifetime is equal to the energy in a monotonic tension test. Based on this theory, fatigue life can be calculated by dividing monotonic strain energy by a hysteresis energy model, which is a function of stress amplitude. Recent studies have focused on developing this method for a sine wave loading pattern — a variable strain rate. In order to remove the effects of a variable strain rate throughout the fatigue cycle, a constant strain rate triangle wave loading pattern was tested. The testing was conducted at various frequencies to evaluate the effects of multiple constant strain rates. Hysteresis loops created with sine wave loading and triangle loading were compared. The effects of variable and constant strain rate loading patterns on hysteresis loops throughout a specimens’ fatigue life are examined.
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ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
June 11–15, 2012
Copenhagen, Denmark
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4473-1
PROCEEDINGS PAPER
Strain Rate and Loading Waveform Effects on an Energy-Based Fatigue Life Prediction for AL6061-T6
Todd Letcher,
Todd Letcher
The Ohio State University, Columbus, OH
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M.-H. Herman Shen,
M.-H. Herman Shen
The Ohio State University, Columbus, OH
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Onome Scott-Emuakpor,
Onome Scott-Emuakpor
Air Force Research Laboratory, WPAFB, OH
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Tommy George,
Tommy George
Air Force Research Laboratory, WPAFB, OH
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Charles Cross
Charles Cross
Air Force Research Laboratory, WPAFB, OH
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Todd Letcher
The Ohio State University, Columbus, OH
M.-H. Herman Shen
The Ohio State University, Columbus, OH
Onome Scott-Emuakpor
Air Force Research Laboratory, WPAFB, OH
Tommy George
Air Force Research Laboratory, WPAFB, OH
Charles Cross
Air Force Research Laboratory, WPAFB, OH
Paper No:
GT2012-68911, pp. 225-233; 9 pages
Published Online:
July 9, 2013
Citation
Letcher, T, Shen, MH, Scott-Emuakpor, O, George, T, & Cross, C. "Strain Rate and Loading Waveform Effects on an Energy-Based Fatigue Life Prediction for AL6061-T6." Proceedings of the ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. Volume 7: Structures and Dynamics, Parts A and B. Copenhagen, Denmark. June 11–15, 2012. pp. 225-233. ASME. https://doi.org/10.1115/GT2012-68911
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