PSI - Issue 36

Available online at www.sciencedirect.com Available online at www.sciencedirect.com Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 36 (2022) 356–361 Structural Integrity Procedia 00 (2021) 000–000 Structural Integrity Procedia 00 (2021) 000–000

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© 2022 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 conference Guest Editors © 2022 Sergiy Bezhenov. 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-revie under responsibility of the conference Guest Editors. Keywords: fatigue; deformation; acoustic emission; hard facing; damages of the material structure; stage-by-stage fracture Within this work, custom-designed model samples of nickel- and titanium-based alloys, as well as carbon and alloyed steel have been studied in comparison. The samples were fabricated both in standard technological process and including ultrasonic surface hardening. Features of cyclic AE characteristics that are identical for di ff erent classes of materials with di ff erent technological inheritance are described. Based on the obtained results, the relationships between the informative parameters of AE and the criteria of the limiting state of the studied materials for power plants under the high-cycle fatigue conditions are established. This enables assessment of the e ff ectiveness of the technological measures aimed at increasing the life of parts of the power plants, based on non-destructive AE control. © 2022 Sergiy Bezhenov. 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 conference Guest Editors. Keywords: fatigue; deformation; acoustic emission; hard facing; damages of the material structure; stage-by-stage fracture 1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Damage evaluation of the power plants materials based on the AE model of material degradation under high-cyclic fatigue Sergiy Bezhenov a a Zaporizhzhia Polytechnic National University, Zhukovsky str., 64, Zaporizhzhia 69063, Ukraine Abstract Modern mechanical engineering products are expected to have an increased lifetime at reduced cost. In order to enable this development, new and improved methods of structural materials strengthening need to be found. Mathematical modelling of the mechanical behaviour of the products in the conditions of fatigue, taking into account various operational, design and technological factors does not provide the necessary accuracy and has to be verified in long-term tests. Therefore, development of a methodology for predicting the limiting state of the structural materials under the long-term periodic load by non-destructive control methods, in particular the acoustic emission (AE) method, remains topical. Within this work, custom-designed model samples of nickel- and titanium-based alloys, as well as carbon and alloyed steel have been studied in comparison. The samples were fabricated both in standard technological process and including ultrasonic surface hardening. Features of cyclic AE characteristics that are identical for di ff erent classes of materials with di ff erent technological inheritance are described. Based on the obtained results, the relationships between the informative parameters of AE and the criteria of the limiting state of the studied materials for power plants under the high-cycle fatigue conditions are established. This enables assessment of the e ff ectiveness of the technological measures aimed at increasing the life of parts of the power plants, based on non-destructive AE control. 1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Damage evaluation of the power plants materials based on the AE model of material degradation under high-cyclic fatigue Sergiy Bezhenov a a Zaporizhzhia Polytechnic National University, Zhukovsky str., 64, Zaporizhzhia 69063, Ukraine Abstract Modern mechanical engineering products are expected to have an increased lifetime at reduced cost. In order to enable this development, new and improved methods of structural materials strengthening need to be found. Mathematical modelling of the mechanical behaviour of the products in the conditions of fatigue, taking into account various operational, design and technological factors does not provide the necessary accuracy and has to be verified in long-term tests. Therefore, development of a methodology for predicting the limiting state of the structural materials under the long-term periodic load by non-destructive control methods, in particular the acoustic emission (AE) ethod, remains topical.

1. Introduction 1. Introduction

The task of obtaining reliable data on fatigue resistance of structural materials is relevant for many sectors of the economy, as the vast majority of engineering structures operate under cyclic loads, when the determining type of failure is fatigue. The problem of ensuring the necessary durability of the responsible parts, in particular, the gas The task of obtaining reliable data on fatigue resistance of structural materials is relevant for many sectors of the economy, as the vast majority of engineering structures operate under cyclic loads, when the determining type of failure is fatigue. The problem of ensuring the necessary durability of the responsible parts, in particular, the gas

a Corresponding author. Tel.: + 38 061 7698512 ; fax: + 38 061 7642141. E-mail address: bezhenov@zntu.edu.ua a Corresponding author. Tel.: + 38 061 7698512 ; fax: + 38 061 7642141. E-mail address: bezhenov@zntu.edu.ua

2452-3216 © 2022 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 conference Guest Editors 10.1016/j.prostr.2022.01.046 2210-7843 © 2022 Sergiy Bezhenov. 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 conference Guest Editors. 2210-7843 © 2022 Sergiy Bezhenov. 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 conference Guest Editors.