PSI - Issue 32

Available online at www.sciencedirect.com Available online at www.sciencedirect.com Sci nceDirect Structural Integrity Procedia 00 (2021) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000–000

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ScienceDirect

Procedia Structural Integrity 32 (2021) 152–157

© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” The "in situ" method of determining the accumulation of irreversible fatigue damage was applied. It is based on the analysis of nonlinear features of the feedback signal in a closed system of an ultrasonic fatigue installation, which allowed us to relate the microscopic mechanisms of fatigue with model representations, as well as to consider the stages of damage evolution based on the nonlinear kinetics of defect accumulation during cyclic loading in high - and gigacycle fatigue modes. In the mode of ultra high cycle (gigacycle) fatigue, the material exhibits abnormalities of elastic properties, which lead to the effect of non-linearity in the oscillation amplitude. © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” Keywords: fracture; gigacycle fatigue; surface morphology. Abstract The influence of consecutive shock-wave and gigacycle fatigue loads on the lifetime of titanium alloy VT6 (Ti-6A1-4V) was inv stigat d. An exp rimental methodology for estimating the ultra-hig cycle lifetime was developed with reference to accident l high-sp ed collision of soli particles with fan blades and subsequent fatigu failure un r the flight cycle conditions normal for operating aircraft engines. The program o ultr -high cycle loadi g (the numbe of cycles is 10 7 -10 9 ) of specially made specimens was implem ted xperimentally. In these experiments, massive flat targets made of titanium alloy VT6 after shock-wave loading were i pacted by a flat striker (explosiv generator method), which initiat d controlled damage in the material. Ultra-high cycl loading tests were car ed out on the Shimadzu USF-2000 ultrasonic testing machine, which made it possible to conduct fatigue l i up to 10 8 -10 10 cycles and frequency of 20 kHz. The "in situ" method of d term ing the accumulation of irreversible fatigue damage was applied. It is based on the analysis of nonlinear featur s f the f dback signal in a closed system of an ultr sonic f tigue installation, which allowed us to re ate the microscopic mechanisms of fatigue with model repre en ations, as well as to consider the stages of dam ge evol tion based on the n nlinear kinetics of de ec accumulation du ing cyclic l ading in high - and g gacycle f tigue modes. In the m de of ultra high cycle (gigacycle) fatigu , the materi l exhibits abnormalities of elastic properties, which lead to the ffect of non-linearity in the oscil ation mplitude. © 2021 The Authors. Published by ELSEVIER B.V. This is an open acce s article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review u der re ponsibility of scientific committe of the XXIIth Winter School on Continuous Media Mechanics” K ywords: fracture; gigacycle fatigue; surface morphology. XXIIth Winter School on Continuous Media Mechanics Prediction of titanium alloy Ti-6A1-4V lifetime under consecutive shock-wave and gigacycle fatigue loads V.A. Oborin a, *, Y.V. Bayandin a , M.V. Bannikov a , A.S. Savinykh b , G.V. Garkushin b , S.V. Razorenov b , O.B. Naimark a a Institute of Continuous Media Mechanics of the Ural Branch, RAS, Perm614013, 1 Academician Korolev Str., Russian Federation b Institute of Problems of Chemical Physics, RAS, Chernogolovka142432, 1 Academician Semenov avenue , Russian Federation Abstract The influence of consecutive shock-wave and gigacycle fatigue loads on the lifetime of titanium alloy VT6 (Ti-6A1-4V) was investigated. An experimental methodology for estimating the ultra-high cycle lifetime was developed with reference to accidental high-speed collision of solid particles with fan blades and subsequent fatigue failure under the flight cycle conditions normal for operating aircraft engines. The program of ultra-high cycle loading (the number of cycles is 10 7 -10 9 ) of specially made specimens was implemented experimentally. In these experiments, massive flat targets made of titanium alloy VT6 after shock-wave loading were impacted by a flat striker (explosive generator method), which initiated controlled damage in the material. Ultra-high cycle loading tests were carried out on the Shimadzu USF-2000 ultrasonic testing machine, which made it possible to conduct fatigue loading tests up to 10 8 -10 10 cycles and frequency of 20 kHz. XXIIth Winter School on Continuous Media Mechanics Prediction of titanium alloy Ti-6A1-4V lifetime under consecutive shock-wave and gigacycle fatigue loads V.A. Oborin a, *, Y.V. Bayandin a , M.V. Bannikov a , A.S. Savinykh b , G.V. Garkushin b , S.V. Razorenov b , O.B. Naimark a a Institute of Continuous Media Mechanics of the Ural Branch, RAS, Perm614013, 1 Academician Korolev Str., Russian Federation b Insti ute of Problem of Chemical Phy ics, RAS, Che nogolovka142432, Academi ian Seme ov avenue , Russian Fed ration

* Corresponding author. Tel.: +7-342-237-8312. E-mail address: oborin@icmm.ru * Corresponding author. Tel.: +7-342-237-8312. E-mail ad ress: oborin@icmm.ru

2452-3216© 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” 2452-3216© 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review u der re ponsibility of scientific committe of the XXIIth Winter School on Continuous Media Mechanics”

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” 10.1016/j.prostr.2021.09.022