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 Structural Integrity 00 (2020) 000–000

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

Procedia Structural Integrity 28 (2020) 2416–2423

© 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 This paper studies the notch-induced anisotropic fracture behaviour in progressively cold draw pearlitic steels. The necessity is emphasized of both stress triaxiality ( constr int ) and microstructural anisotropy ( rie tation ) to induce anisotropic fracture behavi ur in the pearlitic steel wires. A materials sci nce approach to the p enomenon is proposed, so that the strongly anisotropic fracture behaviour of the steels with high level of strain hardening (which exhibit a fracture profile with 90º step) is rationalized on th b sis of the markedly oriented pearlitic microstructure of the cold drawn pe rlitic steels that i fluences the o erative micromechanism of fracture in this particular case, and a sufficient level of stress triaxiality ( constraint ) in the notched speci ens is required to obtain the af resaid anisotropic fracture behaviour (associated with cracking/fracture path deflection and mixed mode propagation ) and to avoid the otherwise is tropic fracture behaviour appearing for lo stress triaxiality (constraint) levels, in spite of the marked microstructural anisotropy (orientation) in the most heavily cold drawn pearlitic steels. © 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 1st Virtual European Conference on Fracture On the necessity of triaxiality and microstructural orientation to produce anisotropic fracture in cold drawn pearlitic steel: Resembling John Ford’s Monument Valley Jesús Toribio*, Francisco-Javier Ayaso Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain Abstract This paper studies the notch-induced anisotropic fracture behaviour in progressively cold drawn pearlitic steels. The necessity is emphasized of both stress triaxiality ( constraint ) and microstructural anisotropy ( orientation ) to induce anisotropic fracture behaviour in the pearlitic steel wires. A materials science approach to the phenomenon is proposed, so that the strongly anisotropic fracture behaviour of the steels with high level of strain hardening (which exhibit a fracture profile with 90º step) is rationalized on the basis of the markedly oriented pearlitic microstructure of the cold drawn pearlitic steels that influences the operative micromechanism of fracture in this particular case, and a sufficient level of stress triaxiality ( constraint ) in the notched specimens is required to obtain the aforesaid anisotropic fracture behaviour (associated with cracking/fracture path deflection and mixed mode propagation ) and to avoid the otherwise isotropic fracture behaviour appearing for low stress triaxiality (constraint) levels, in spite of the marked microstructural anisotropy (orientation) in the most heavily cold drawn pearlitic steels. 1st Virtual European Conference on Fracture On the necessity of triaxiality and microstructural orientation to produce anisotropic fracture in cold drawn pearlitic steel: Resembling John Ford’s Monument Valley Jesús Toribio*, Francisco-Javier Ayaso Fracture & Structural Integrity Research Group (FSIRG), University of al manca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain Keywords: cold-drawn pearlitic steel; notch-induced anisotropic fracture; stress triaxiality; constraint; fracture path deflection. Keywords: cold-drawn pearlitic steel; notch-induced anisotropic fracture; stress triaxiality; constraint; fracture path deflection.

* 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 © 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 acces article under CC BY-NC-ND license (ht ps:// r ativecommons. rg/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.2020.11.091