PSI - Issue 28

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 28 (2020) 2118–2125

© 2020 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 European Structural Integrity Society (ESIS) ExCo According to the test results, the dependencies of the AE parameters on the relative deformation were plotted. An analysis of these dependencies made it possible to distinguish the stages of changes in AE characteristics that correlate with the stages of changes in mechanical properties and material damage. New relations connecting acoustic emission parameters to the relative number of cycles before fracture of steels studied were obtained. © 2020 L.R. Botvina, M.R. Tyutin, I.O. Sinev, and A.I. Bolotnikov. 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 European Structural Integrity Society (ESIS) ExCo Keywords: Residual strength; acoustic emission; fatigue; damage Introduction Long-term use of objects of various fields of technology requires the development of methods for diagnosing the state of the material of these objects at various stages of operation. This task, in turn, makes it necessary to assess the stages of damage development in the material during its service life and establish a relationship of them with the 1st Virtual European Conference on Fracture The effect of preliminary cyclic loading on acoustic emission parameters and damage of structural steels L.R. Botvina a , M.R. Tyutin a , I.O. Sinev a,b , and A.I. Bolotnikov a,b * a A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences,49 Leninsky prospect, Moscow, 119334, Russia b Bauman Moscow State Technical University, 2-nd Baumanskaya, 5, 105005, Moscow, Russia Abstract Preliminary cyclic loading of structural low-carbon and 15Cr2MnMoV steels specimens to a relative lifetime of 0.3, 0.5 and 0.7 were conducted. After preloading, tensile tests with the acoustic emission (AE) registration were performed and the effects of preliminary cyclic loading on the intensity ( dN AE /dt ), the cumulated number ( Σ N AE ) and energy ( Σ E AE )of acoustic emission signals, and the b AE -value (the slope coefficient of cumulative distributions of the AE signals amplitudes) were investigated.

* Corresponding author. Tel.: +7-499-135-96-83; fax: +7-499-135-86-80. E-mail address: botvina@imet.ac.ru

2452-3216 © 2020 L.R. Botvina, M.R. Tyutin, I.O. Sinev, and A.I. Bolotnikov. 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 European Structural Integrity Society (ESIS) ExCo

2452-3216 © 2020 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 European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.11.038