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.
Strain Rate and Loading Waveform Effects on an Energy-Based Fatigue Life Prediction for AL6061-T6
Air Force Research Laboratory,
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received May 29, 2013; final manuscript received August 28, 2013; published online November 1, 2013. Editor: David Wisler.
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Letcher, T., Shen, M. H., Scott-Emuakpor, O., George, T., and Cross, C. (November 1, 2013). "Strain Rate and Loading Waveform Effects on an Energy-Based Fatigue Life Prediction for AL6061-T6." ASME. J. Eng. Gas Turbines Power. February 2014; 136(2): 022502. https://doi.org/10.1115/1.4025497
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