Fatigue crack growth of Ti-62222 titanium alloy under constant amplitude and miniTWIST flight spectra at 25°C and 175°C
Copyright policy )Fatigue crack growth of Ti-62222 titanium alloy under constant amplitude and miniTWIST flight spectra at 25°C and 175°C
Abstract Fatigue crack growth behavior was investigated for Ti-62222 titanium alloy under constant amplitude (R = 0.1 and 0.5) and miniTWIST flight spectra at 25 and 175°C. Crack closure was observed at threshold and near threshold for both temperatures with R = 0.1 but not for R = 0.5. Based upon applied or effective ΔK, fatigue crack growth behavior for a given R ratio showed no significant temperature effect. MiniTWIST flight spectra fatigue crack growth life at 175°C, however, was 2.5–3.5 times greater than at 25°C. Fatigue crack growth life calculations using NASA/FLAGRO were conservative. Fatigue crack growth was transgranular with SEM fracture surface morphology dependent upon both ΔK and temperature with significant increase in secondary cracking at 175°C.
- University of Iowa United States
- University of Idaho United States
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