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) 1969–1974

© 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 The fatigue limit is an important material property used for design purposes. The thermographic method was developed to determine it in a more optimized way since the traditional techniques are expensive and time consuming. It correlates the temperature increasing with several loading amplitudes and defines the fatigue limit as the stress below which no heat is degenerated under cyclic loading. As this method depends on the number of cycles of each loading performed and needs a minimum heat generation for data acquisition, both variables are analyzed to determine their effect on the fatigue limit measurement. For that, a design of experiment is performed using the complete factorial planning. The results show that fatigue limit measurement by thermographic method is dependent on both variables for proposed study domain. However, it is more dependent on the incremental loading cycles than on the frequency since it delimits the loading application and consequently the heat generation for temperature increasing. © 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 1st Virtual European Conference on Fracture Sensitivity analysis of load frequency and block cycles on the fatigue limit measurement by thermographic method Carlos Filipe Cardoso Bandeira a *, Jaime Tupiassú Pinho de Castro a , Florian Pradelle a , Paulo Pedro Kenedi b a Mechanical Engineering Department, Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Rua Marquês de São Vicente 225, Rio de Janeiro, RJ 22453-900, Brazil b Federeal Center of Technological Educuation Celso Suckow da Fonseca (CEFET), Rua General Canabarro 485, Rio de Janeiro - RJ, 20271 204, Brazil

* Corresponding author. E-mail address: carlosfilipecbandeira@gmail.com

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

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.2020.11.020