Effect of stress ratio on VHCF behavior for a compressor blade titanium alloy |
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| Affiliation: | 1. ICAD Russian Academy of Science – 19/18, 2nd Brestskay street, Moscow, Russia;2. MAI – National Research University, 4, Volokolamskoe Hw, Moscow, Russia;3. Arts et Metiers Paris Tech, I2M, CNRS, Esplanade des Arts et Metiers, Talence, France;4. Aviaregister, Air.Sheremetievo-1, PO Box 54, Moscow reg., Chimkovskiy state, Russia |
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| Abstract: | Effect of stress ratio on fatigue properties of a titanium alloy (TC-17) in the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) were investigated by electromagnetic and ultrasonic fatigue testing. The S–N curves at R = ?1, 0.1, 0.5 and 0.7 at 110 Hz and 20 kHz were obtained and discussed. The effects of frequency on fatigue strength was also investigated. It was concluded that the fatigue strength with 50% fatigue failure probability at R = 0.1, 0.5 and 0.7 is lower to the Goodman line and shows a bilinear decreasing trend. Cleavage fracture of primary grains in the surface and interior initiation zone were observed. The formation of the facets induced by the basal or prismatic slips of the H.C.P grains decreased the fatigue strength with variation in mean stress. |
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| Keywords: | Titanium alloy High cycle fatigue Very high cycle fatigue Fatigue failure Mean stress |
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