PSI - Issue 42

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

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Procedia Structural Integrity 42 (2022) 102–109

© 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 scientific committee of the 23 European Conference on Fracture – ECF23 Abstract This study focuses on the increase in temperature during cyclic loading of the conventionally manufactured specimens of 42CrMo4 + QT steel. It is assumed that it could provide an additional parameter to estimate fatigue life performance and fatigue limit. Four different specimen types are discussed, two of hourglass type and two of dog-bone type. The potential of an innovative and unbiased method for estimating the fatigue limit from temperature increase caused by the self-heating effect induced during cyclic loading is evaluated. Second, the use of the Fargione method to approximate fatigue life performance, and especially, to establish limiting energy is evaluated. It is concluded that it is not a suitable parameter for this specific material and set-up conditions. © 2020 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/) 1. Introduction With a high demand for determining fatigue properties of materials and structures, the potential of innovative methods for fast fatigue experimental evaluation is analyzed. Representatives of such methods discussed in this article focus on evaluating the temperature response measured on the surface of a specimen during cycling testing. The observed heat dissipation can be used as an additional parameter for estimating the service life of a component or for determining the fatigue limit of the given materials; see Fargione (2001), Amiri and Khonsari (2010), La Rosa and en a ess article 23 European Conference on Fracture - ECF23 Fatigue strength estimation of 42CrMo4+QT from the temperature evolution during cyclic loading Martin Matušů a *, Jan Papuga a , Matěj Mžourek a a Czech Technical University in Prague, Technicka 4, Prague, 160 00,Czech Republic a , Jan Pa a a Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: Infrared thermography; Fatigue limit estimation; Fatigue analysis, Self-heating

* Corresponding author. Tel.: +420 224 352 519. E-mail address: martin.matusu@fs.cvut.cz

2452-3216 © 2020 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 23 European Conference on Fracture - ECF23

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 scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.012