PSI - Issue 28

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Procedia Structural Integrity 00 (2020) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Procedia Structur l Integrity 00 (2020) 000–000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 28 (2020) 2382–2385

© 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 © 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 this paper, stress intensity factor (SIF) was calculated in a bar subjected to tensile loading, considering a circular inner crack that exhibited certain eccentricity in relation to the cylinder axis. The computation was performed by means of the finite element method (FEM) using a three dimensional (3D) model and the J -integral, the analyzed variables being the diameter and the eccentricity of the circular inner crack. Results show that the SIF is higher at the point of the crack front closest to the bar surface and that an increase of relative crack eccentricity or of relative crack diameter raises the difference between the SIF values at the crack point closest to the bar surface and the crack point furthest from it, thus the existence of eccentricity in the initial crack leads to an increase of such a parameter when fatigue propagation occurs. © 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 this paper, stress intensity factor (SIF) was calculated in a bar subjected to tensile loading, considering a circular inner crack that exhibited certain eccentricity in relation to the cylinder axis. The computation was performed by means of the finite element method (FEM) using a three dimensional (3D) model and the J -integral, the analyzed variables being the diameter and the eccentricity of the circular inner crack. Results show that the SIF is higher at the point of the crack front closest to the bar surface and that an increase of relative crack eccentricity or of relative crack diameter raises the difference between the SIF values at the crack point closest to the bar surface and the crack point furthest from it, thus the existence of eccentricity in the initial crack leads to an increase of such a parameter when fatigue propagation occurs. 1. Introduction In steel bars, interior failure mechanisms under high and very high cycle fatigue are produced with the formation of fish-eye pattern (with approximately circular geometry) originated from inclusions located inside the material, a phenomenon observed by Li et al. (2016) and by Nehila et al. (2018). 1. Introduction In steel bars, interior failure mechanisms under high and very high cycle fatigue are produced with the formation of fish-eye pattern (with approximately circular geometry) originated from inclusions located inside the material, a phenomenon observed by Li et al. (2016) and by Nehila et al. (2018). 1st Virtual European Conference on Fracture Stress intensity factor for an eccentric circular inner crack 1st Virtual European Conference on Fracture Stress intensity factor for an eccentric circular inner crack in a round bar subjected to tensile loading Jesús Toribio*, Juan-Carlos Matos, Beatriz González Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain in a round bar subjected to tensile loading Jesús Toribio*, Juan-Carlos Matos, Beatriz González Fracture & Structural Integrity Research Group (FSIRG), University of alamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain Keywords: Cracked bar; eccentric circular inner crack; J -integral; finite element method; stress intensity factor. Keywords: Cracked bar; eccentric circular inner crack; J -integral; finite element method; stress intensity factor.

* 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 © 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 ope access article under t CC BY-NC-ND license (https://cr ativecommons.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.2020.11.086