A new vibration-based multiaxial fatigue testing methodology for assessing high-cycle turbine engine material fatigue strength at various stress ratios is presented. The idea is to accumulate fatigue energy on a base-excited plate specimen at high-frequency resonant modes and to complete a fatigue test in a much more efficient way at very low cost. The methodology consists of (1) a topological design procedure, incorporating a finite element model, to characterize the shape of the specimens for ensuring the required stress state/pattern, (2) a vibration feedback empirical procedure for achieving the high-cycle fatigue experiments with variable-amplitude loading, and finally (3) a yielding procedure for achieving various uniaxial stress ratios. The performance of the methodology is demonstrated by the experimental results from mild steel, 6061-T6 aluminum, and Ti-6Al-4V plate specimens subjected to fully reversed bending for both uniaxial and biaxial stress states.
A New Multiaxial Fatigue Testing Method for Variable-Amplitude Loading and Stress Ratio
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received October 2002, final manuscript received March 2003. Assoc. Editor: H. R. Simmons. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Atlanta, GA, June 16–19, 2003, Paper No. 2003-GT-38512.
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George , T. J., Shen, M. H., Nicholas , T., and Cross, C. J. (September 18, 2006). "A New Multiaxial Fatigue Testing Method for Variable-Amplitude Loading and Stress Ratio ." ASME. J. Eng. Gas Turbines Power. October 2006; 128(4): 857–864. https://doi.org/10.1115/1.1788687
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