PSI - Issue 33

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

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

Procedia Structural Integrity 33 (2021) 1131–1138

© 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 the scientific committee of the IGF ExCo © 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo Abstract This paper pre ents a combined micro- and macro-app oach t the fracture of high-stre gth pearlitic steel bars subjected to multiaxial stress tates produce by no ch s of very diff rent geometries. A fracture criterion based on the i tortional p rt of the strain energy density ( r, accordingly, the quivalen stress in the von Mi es sen e) averag d ver a critic l distanc characteristic of th micros ructure of the material is developed towards a more physically s und crit rion on the basis of the process zone concept, i.e., the critical d main or fracture region is not constant, but depends on the ess t iaxiality in the notched geometry under co si eration. Although this combined approach is m r difficult due to microstructural considerations, t may also be implemented in a computer, since the size of the afore-said process zone can also be predicted by numerical analysis. © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article und r the CC BY-NC-ND licens (https:// reativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo IGF26 - 26th International Conference on Fracture and Structural Integrity Macro- and micro-approach to the notch-induced fracture process and notch tensile strength in eutectoid hot-rolled pearlitic steel: Weakest Link versus Process Zone Fracture Criterion Jesús Toribio * Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain Abstract This paper presents a combined micro- and macro-approach to the fracture of high-strength pearlitic steel bars subjected to multiaxial stress states produced by notches of very different geometries. A fracture criterion based on the distortional part of the strain energy density (or, accordingly, the equivalent stress in the von Mises sense) averaged over a critical distance characteristic of the microstructure of the material is developed towards a more physically sound criterion on the basis of the process zone concept, i.e., the critical domain or fracture region is not constant, but depends on the stress triaxiality in the notched geometry under consideration. Although this combined approach is more difficult due to microstructural considerations, it may also be implemented in a computer, since the size of the afore-said process zone can also be predicted by numerical analysis. IGF26 - 26th International Conference on Fracture and Structural Integrity Macro- and micro-approach to the notch-induced fracture process and notch tensile strength in eutectoid hot-rolled pearlitic steel: Weakest Link versus Process Zone Fracture Criterion Jesús Toribio * Fracture & Structural Integrity Research Group (FSIRG), University of al manca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain Keywords: high-strength pearlitic steel, multiaxial stress states, stress triaxiality, strain energy denstity, weakest link, process zone. Keywords: high-strength pearlitic steel, multiaxial stress states, stress triaxiality, strain energy denstity, weakest link, process zone.

* 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 © 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open acc ss article und r the CC BY-NC-ND licens (https:// reativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo

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 the scientific committee of the IGF ExCo 10.1016/j.prostr.2021.10.126