HCF + LCF Interactions at Elevated Temperature
Final rept. 1 Jan 2003-1 Jan 2005
PORTSMOUTH UNIV (UNITED KINGDOM)
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This report results from a contract tasking University of Portsmouth as follows The onset of high cycle fatigue HCF crack propagation in Ti- 6Al-4V will be studied under combined HCFlow cycle fatigue LCF loading conditions at elevated temperatures up to 350 deg C where creep stress ratcheting and environmental effects may arise. The study will be applied to a simulated mission-loading spectrum. SEM fractography metallography and crack closure measurements will be used to assess the mechanisms contributing to fatigue crack growth. The study will be carried out on corner crack CN square cross-section specimens of forged Ti-6Al-4V and on single edge cracked rolled plate specimens of the same alloy. Information previously obtained for this alloy at room temperature will provide a baseline for comparison.