PSI - Issue 28

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 il l li t . i i t. tr t r l I t rit r i ( )

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ScienceDirect

Procedia Structural Integrity 28 (2020) 1449–1457

1st Virtual European Conference on Fracture Experimental and numerical assessment of the end of the thermoelastic effect during static traction test Giacomo Risitano, Dario Santonocito* University of Messina, Department of Engineering, Contrada di Dio, 98166 Messina, Italy i it f i , t t f i i , t i i , i , It l

© 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 Abstract In the last thirty years Infrared Thermography has been widely adopted as a technique able to predict the fatigue life of materials in a short amount of time. In the recent years, Risitano and Risitano proposed the Static Thermographic Method as a rapid test procedure able to predict the fatigue limit of the material from a static traction test, evaluating the end of the thermoelastic phase. In this work, the energetic release during a uniaxial static test of a medium carbon steel C45 has been experimentally investigated. A numerical finite element model has been developed in order to predict the temperature evolution of the material under the same monotonic load conditions. A comparison between the experimental and numerical temperature evolution has been carried out showing how the end of the thermoelastic phase is reached before the macroscopic yielding stress of the material. The Static Thermographic Method may be adopted as a novel energetic approach to assess the macroscopic stress value that introduce in the material the first micro plasticization, hence will lead it to fatigue failure. © 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 Keywords: energetic release; C45; Static Thermographic Method 1. Introduction The adoption of Infrared Thermography (IR) for the fatigue assessment of materials has severally reduced the amount of time required to obtain the Wöhler curve and the fatigue limit. The Thermographic Method (TM), a rapid procedure which requires a very limited number of specimens compared to traditional fatigue tests, has been proposed t l t t i t i l t t i l t i t t ti li t i l i t t ti . t t , i it i it t t ti i t i t t l t i t t ti li it t t i l t ti t ti t t, l ti t t t l ti . t i , t ti l i i i l t ti t t i t l i t ll i ti t . i l i it l t l l i t i t t t t l ti t t i l t t i l iti . i t t i t l i l t t l ti i t i t t t l ti i t i i l i t t t i l. t ti i t t l ti t t i t l t t i t i t t i l t i t i l ti i ti , ill l it t ti il . t . li . . This is an op ti l t li nse (https://creativecommons.org/licenses/by / . i i ilit t t t l t it i t : r ti r l ; ; t ti r r i t . i ti t ti t t i l ll t t ti i t t i t l t ti li it. i t , i i i li it i t t iti l ti t t ,

* Corresponding author. Tel.: +39 3396190552. E-mail address: dsantonocito@unime.it i t r. l.: . - il : t it i .it rr

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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 i i rti l r t - - li ( tt :// r ti . r /li / - - / . ) r-r i r r i ilit f t r tr t r l I t rit i t ( I )

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.2020.10.118