PSI - Issue 37

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 37 (2022) 989–994

ICSI 2021 The 4th International Conference on Structural Integrity Review and synthesis of stress intensity factor (SIF) solutions for annular outer cracks in round bars under tension loading ICSI 2021 The 4th International Conference on Structural Integrity Review and synthesis of stress intensity factor (SIF) solutions for annular outer cracks in round bars under tension 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 Jesús Toribio*, Beatriz González, Juan-Carlos Matos Fracture & Structural Integrity Research Group (FSIRG), University of Sal manca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain

© 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 Pedro Miguel Guimaraes Pires Moreira © 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 Pedro Miguel Guimaraes Pires Moreira Keywords: stress intensity factor; finite element method; J -integral; circumferentially-cracked round bar; circular ligament; eccentricity; contact. 1. Introduction Round bar specimens with annular outer cracks exhibit clear advantages in relation to the standard specimens recommended by the ASTM E399 Standard (ASTM, 2012), namely: (i) they are easy to machine and thus cheaper; (ii) they need less amount of material to guarantee the plane strain condition because the circular geometry increases the constraint; (iii) the annular crack does not end in a plane stress region. Abstract The stress intensity factor (SIF) is comput d i a ircumfere tia ly-cracked round bar (CCRB) under tensile load, c nsidering th t the resistan liga t is circular and exh bits certain ecc tricity in relati n to the cylinder axis. The computation was performed by ans of t finit element method (FEM) using a thr e dimensional (3D) model and the J -integral, the analyzed variables being the diameter and the ccentricity of the circular lig ment. Results show that the SIF is higher at the de pest point of the rack and that an increase of eccentricity (in relation to the bar axis) raises the difference between the SIF values at the deepest and surface points of the crack. © 2022 The Authors. Published by ELSEVIER B.V. This is an ope acces article under the CC BY-NC-ND license (https://cre tivecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Keywords: stress intensity factor; finite element method; J -integral; circumferentially-cracked round bar; circular ligament; eccentricity; contact. 1. Introduction Round bar specimens with annular outer cracks exhibit clear advantag s in r lation to the standard specimens recomme ded by the ASTM E399 Standard (ASTM, 2012), namely: (i) they are easy to machine and thus cheaper; (ii) they need less amount of material t guarantee the la strain condition because the circular geometry increases the constraint; (iii) the annular crack does not end in a plane stress region. Abstract The stress intensity factor (SIF) is computed in a circumferentially-cracked round bar (CCRB) under tensile load, considering that the resistant ligament is circular and exhibits 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 ligament. Results show that the SIF is higher at the deepest point of the crack and that an increase of eccentricity (in relation to the bar axis) raises the difference between the SIF values at the deepest and surface points of the crack.

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

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 Pedro Miguel Guimaraes Pires Moreira 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an ope acces article under th CC BY-NC-ND lic nse (https://cre tivecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira

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 Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.02.035