PSI - Issue 23

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000

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ScienceDirect

Procedia Structural Integrity 23 (2019) 316–321

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. Keywords: modeling, block-type loading, mechanics of damaged media, numerical and full-scale experiment, fatigue life, strength, residual life . 1. Introduction Cyclic properties of structural materials play an important part in adequately evaluating strength and service life of elements and units of bearing structures subjected to alternating combined thermo-mechanical effects. The To assess the reliability and the scope of applicability f the d fining relations of MDM, processes of plas ic deformation and d mag accu ul tion in a number o struct ral ste ls in low-cycle e ts ave been nume ically analyzed, an the obtained results have b en compared with th data f om full-scale exp rim nts. It is show that the proposed MDM model qualitatively and, accurately enough for eng neering purposes, quantitative y describes the main effect of th processes of plastic deformation and fatigue damage accumulation in structural alloys under block-type nonstationary nonsymmetrical low-cycle loading. © 201 9 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. Keywords: modeling, block-type loading, mechanics of damaged media, numerical and full-scale experiment, fatigue life, strength, residual life . 1. Introduction Cyclic properties of structural ma erials play an impor ant pa t in adequately evaluating strength nd service lif of elements and units of bearing structures subjected to alternating combined thermo-mechanical effects. The 9th International Conference on Materials Structure and Micromechanics of Fracture Modeling fatigue life of structural materials under block-type nonsymmetrical loading Volkov I.A., Igumnov L.A., Litvinchuk S.Yu., Boev A.V.* Research Institute for Mechanics, National Research Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, 23 Prospekt Gagarina (Gagarin Avenue) BLDG 6, 603950, Russian Federation Abstract In the framework of mechanics of damaged media (MDM), a mathematical model describing processes of thermo-plastic deformation and fatigue damage accumulation under low-cycle loading is developed. The MDM model consists of three interconnected parts: relations defining cyclic thermoplastic behavior of the material included for its dependence on the failure process; equations describing damage accumulation kinetics; a strength criterion of the damaged material. To assess the reliability and the scope of applicability of the defining relations of MDM, processes of plastic deformation and damage accumulation in a number of structural steels in low-cycle tests have been numerically analyzed, and the obtained results have been compared with the data from full-scale experiments. It is shown that the proposed MDM model qualitatively and, accurately enough for engineering purposes, quantitatively describes the main effects of the processes of plastic deformation and fatigue damage accumulation in structural alloys under block-type nonstationary nonsymmetrical low-cycle loading. 9th International Conference on Materials Structure and Micromechanics of Fracture Modeling fatigue life of structural materials under block-type nonsymmetrical loading Volkov I.A., Igumnov L.A., Litvinchuk S.Yu., Boev A.V.* Research Institute for Mechanics, N tional Research Lobach vsky State University of Nizhny Novg rod, Nizhny Novgorod, 23 Prospekt Gagarina (Gagarin Avenue) BLDG 6, 603950, Russian Federation Abstract In the framework of mech nics of dam ged me ia (MDM), a m thematical m d l describing process s of therm -plastic deformation and fatigue damage accumulation under low-cycle loading is d veloped. The MDM model consists of thre interconnected parts: relat ons defining yclic thermoplastic behavior of the material included for its dependence on the failure process; equa ions descr bing amage accumulation kinetics; a str ngth criterion of the damaged mat rial.

* Corresponding author. Tel.: +7950600 7151. E-mail address: a_boev@mech.unn.ru * Corresponding author. Tel.: +7950600 7151. E-mail address: a_boev@mech.unn.ru

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the scientific committee of the IC MSMF organizers.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.106