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Fatigue life calculation for titanium alloys considering the influence of microstructure and manufacturing defects
Affiliation:1. G.S. Pisarenko Institute for Problems of Strength, National Academy of Sciences of Ukraine, Kyiv, Ukraine;2. G.V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine;1. Pacific Oceanological Institute, FEB RAS, 43, Baltiyskaya Street, Vladivostok, 690041, Russia;2. Far Eastern Federal University, 8, Sukhanova Street, Vladivostok, 690950, Russia;1. Frantsevich Institute for Problems of Materials Science, 3 Krzhyzhanivsky Str., Kyiv 03680, Ukraine;2. Physico-Technological Institute of Metals and Alloys NAS of Ukraine, 34/1 Vernadsky Ave., Kyiv 142 03680, Ukraine;3. Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, Japan;4. National Technical University of Ukraine “Kyiv Polytechnic Institute”, Engineering-Physical Faculty, 35 Polytekchnichna Str., Kyiv 03056, Ukraine;1. V.P. Komisarenko Institute of Endocrinology and Metabolism of National Academy of Medical Sciences of Ukraine, Kyiv, Ukraine;2. Nagasaki University, Nagasaki, Japan;1. Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Republic of Korea;2. Advanced Institutes of Convergence Technology, Seoul National University, Gwanggyo, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-270, Republic of Korea;3. Department of Mechanical Engineering, 141 Light Engineering, Stony Brook University, Stony Brook, NY 11794, USA;4. School of Biomedical Engineering, Korea University, Seoul 136-703, Republic of Korea
Abstract:A model is presented for calculation of the fatigue life to crack initiation in specimens with surface stress concentrators. The model is tested for the results of fatigue testing specimens of Ti–6Al–4V titanium alloy condensate prepared by electron-beam physical vapor deposition method (EB PVD-method). The specimens had manufacturing defects, such as column defects of different diameters reaching the specimen surface. Comparison between results of calculation and experiment showed a good agreement. In order to fill the model, it is sufficient to have the results from monotonic tensile testing and characteristics of microstructure and texture of the starting material.
Keywords:High-cycle fatigue  Fatigue life  Microstructure  Manufacturing defects  Titanium alloys
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