PSI - Issue 39

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

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Procedia Structural Integrity 39 (2022) 484–487

7th International Conference on Crack Paths Fatigue crack paths in eccentric circumferentially cracked round bar 7th International Conference on Crack Paths Fatigue crack paths in eccentric circumferentially cracked round bar

(CCRB) subjected to tensile cyclic loading Jesús Toribio*, Beatriz González, Juan-Carlos Matos Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain (CCRB) subjected to tensile cyclic loading Jesús Toribio*, Beatriz González, Juan-Carlos Matos Fracture & Structural Integrity Research Group (FSIRG), University of al manca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain

© 2021 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 CP 2021 – Guest Editors © 2021 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 CP 2021 – Guest Editors Abstract In this paper, a numerical modelling was developed to study (on the basis of the Paris law) the fatigue propagation paths of eccentric external cracks in circumferentially-cracked round bars (CCRB) subjected to axial displacement. Results demonstrate how the eccentricity (in relation to the wire axis) of the circular resistant ligament increases with the fatigue crack growth. This phenomenon is favoured by the increment of the initial ligament eccentricity (for an initial ligament diameter) and the increase of the Paris exponent m of the material. © 2021 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 CP 2021 – Guest Editors Abstract In this paper, a numerical modelling was developed to study (on the basis of the Paris law) the fatigue propagation paths of eccentric external cracks in circumferentially-cracked round bars (CCRB) subjected to axial displacement. Results demonstrate how the eccentricity (in relation to the wire axis) of the circular resistant ligament increases with the fatigue crack growth. This phenomenon is favoured by the increment of the initial ligament eccentricity (for an initial ligament diameter) and the increase of the Paris exponent m of the material. Keywords: circumferentially-cracked round bar (CCRB); eccentricity of circular ligament; fatigue crack paths; full and partial contact. Keywords: circumferentially-cracked round bar (CCRB); eccentricity of circular ligament; fatigue crack paths; full and partial contact. 1. Introduction A circumferentially cracked round bar (CCRB) may be recommended as a standard test specimen to measure fracture toughness as well as fatigue crack growth rate because the triaxial stress distribution in the proximity of the crack end makes a plane strain condition happen even for a small specimen (Stark and Ibrahim, 1986). 1. Introduction A circumferentially cracked round bar (CCRB) may be recommended as a standard test specimen to measure fracture toughness as well as fatigue crack growth rate because the triaxial stress distribution in the proximity of the crack end makes a plane strain condition happen even for a small specimen (Stark and Ibrahim, 1986).

* Corresponding author. Tel.: +34-677566723; fax: +34-980545002. E-mail address: toribio@usal.es * Corresponding author. Tel.: +34-677566723; fax: +34-980545002. E-mail address: toribio@usal.es

2452-3216 © 2021 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 CP 2021 – Guest Editors 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an ope access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of CP 2021 – Guest Editors

2452-3216 © 2021 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 CP 2021 – Guest Editors 10.1016/j.prostr.2022.03.120