PSI - Issue 23

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

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Procedia Structural Integrity 23 (2019) 281–286

© 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: creep; long-term strength; modeling; mechanics of damaged media; temperature; damage degree; material parameters; numerical and full-scale experiment; Comparison of the numerical and experimen al results makes it po sible o onc ude hat the pr posed defining relations of MDM are reliable in describing degrading initial strength properties of structural materials according to the long strength mechanism. © 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: cr ep; long-term strength; modeling; mechanics of damaged media; temperature; damage degree; material parameters; numerical and full-scale experiment; 9th International Conference on Materials Structure and Micromechanics of Fracture A model of damaged media for describing a creep-induced damage accumulation process Volkov I.A., Igumnov L.A., Modin I.A., Boev E.V.* Research Institute for Mechanics, Nizhny Novgorod Lobachevski National State Research University, 23 Prospekt Gagarina, Nizhny Novgorod 603950, Russia Abstract In the framework of mechanics of damaged media (MDM), a mathematical model describing creep-induced processes of inelastic deformation and damage accumulation is developed. The MDM model consists of three interrelated parts: relations defining inelastic behavior of the material, accounting for its dependence on the failure process; equations describing damage accumulation kinetics; a strength criterion of the damaged material. The results of experimentally studying short-term creep of the VZh-159 heat-resistant alloy at constant temperature values and different values of applied stresses in the specimens are given. Comparison of the numerical and experimental results makes it possible to conclude that the proposed defining relations of MDM are reliable in describing degrading initial strength properties of structural materials according to the long strength mechanism. 9th International Conference on Materials Structure and Micromechanics of Fracture A model of damaged media for describing a creep-induced damage accumulation process Volkov I.A., Igumnov L.A., Modin I.A., Boev E.V.* Research Institute for Mechanics, Nizhny Novgorod Lobachevski National State Research University, 23 Prospekt Gagarina, Nizhny Novgorod 603950, Russia Abstract In the framework of mechanics of dam ged me ia (MDM), a mathematical m del describing cre p-induced proc sses of inelastic deformation nd damage accumul tion is developed. Th MDM mod l consists f thre interrelated parts: rel tions defining inelastic behavio of e material, accountin for its dependence on the failure process; equations describing damage accumulation kin tics; a strength criter on of the da ag d material. Th results of ex er men ally tudying short-term creep of the VZh-159 heat-resistant alloy at constant temperature values and different values applied st esses in the specimens are given.

* Corresponding author. Tel.: +7 987 543 5788. E-mail address: mianet@mail.ru * Correspon ing author. Tel.: +7 987 543 5788. E-mail address: mianet@mail.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.2020.01.100