A new vibration-based 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 geometrical design procedure, incorporating a finite-element model to characterize the shape of the specimen 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 pre-strain procedure for achieving various uniaxial stress ratios. The performance of the methodology is demonstrated with experimental results for mild steel, 6061-T6 aluminum, and Ti-6Al-4V plate specimens subjected to a fully reversed bending, uniaxial stress state.
Goodman Diagram Via Vibration-Based Fatigue Testing
Manuscript received January 1, 2003; revision received September 14, 2004. Review conducted by: W. Soboyejo.
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George, T. J., Shen, M. H., Scott-Emuakpor, O., Nicholas, T., Cross , C. J., and Calcaterra, J. (February 22, 2005). "Goodman Diagram Via Vibration-Based Fatigue Testing ." ASME. J. Eng. Mater. Technol. January 2005; 127(1): 58–64. https://doi.org/10.1115/1.1836791
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