PSI - Issue 36

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 36 (2022) 30–35

© 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 Abstract The paper presents the statistical characteristics of deformation defects on the surface of steel St 20 laboratory specimens obtained under alternating loading. Digital images of the deformed surface layer are used to analyze dynamics of deformation defects accumulation. The structure of deformation defects is represented by a change in characteristics of their distribution on a surface. Discrete deformations of a sample surface layer characterize dynamics of microplastic deformation accumulation during diffuse fracture. The authors suggested a methodological approach to determine the state of damage to a structural material in the range of elastic deformations by deformation defects parameters of a laboratory specimen surface. © 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) This is an open access article under the CC BY-NC-ND org/licenses/by 1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Deformation defects of the structural material as a factor of life aging G. Pysarenko a, *, O. Voynalovich b , A. Maylo a , S. Pysarenko a a G.S. Pisarenko Institute for problems of strength of the National Academy of Sciences of Ukraine, Timiryazevs’ka str. 2, Kiyv 0101 4, Ukraine b National University of Life and Environmental Sciences of Ukraine, Heroiv oborony str.15, Kiyv 03041, Ukraine

Peer-review under responsibility of the conference Guest Editors Keywords: fatigue, damage, surface microrelief, coherent optical scanning

1. Statement of the problem The development a unified approach to assess characteristics of operational damage to a metal structure requires consideration to influence (structural, technological, operational) factors on the destruction process. Shear formation on a surface of the deformable material often occurs at stresses below the elastic limit. Microplastic deformations are initiated by structural mechanisms that depend on the nature of the material, which defines durability of the metal

* Corresponding author. Tel.: +38-044-286-2857. E-mail address: georgiy.pysarenko@gmail.com

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

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.2021.12.079