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) 2390–2395

© 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 study, fracture surfaces of notched specimens of pearlitic steels subjected to constant extension rate tests (CERTs) are analyzed, in an environment causing hydrogen assisted fracture. In order to obtain general results, both different notched geometries (to generate quite distinct stress triaxiality distributions in the vicinity of the notch tip) and diverse loading rates were used. The fracture surfaces were classified in relation to four micromechanical models of hydrogen-assisted micro-damage. To this end, fractographic analysis in each fracture surface was carried out with a scanning electron microscopy. Generated results increase the number of micromechanical models found in the scientific literature. © 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 1st Virtual European Conference on Fracture Influence of microstructural anisotropy on the hydrogen-assisted fracture of notched samples of progressively drawn pearlitic steel Jesús Toribio*, Diego Vergara Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain Abstract In this study, fracture surfaces of notched specimens of pearlitic steels subjected to constant extension rate tests (CERTs) are analyzed, in an environment causing hydrogen assisted fracture. In order to obtain general results, both different notched geometries (to generate quite distinct stress triaxiality distributions in the vicinity of the notch tip) and diverse loading rates were used. The fracture surfaces were classified in relation to four micromechanical models of hydrogen-assisted micro-damage. To this end, fractographic analysis in each fracture surface was carried out with a scanning electron microscopy. Generated results increase the number of micromechanical models found in the scientific literature. 1st Virtual European Conference on Fracture Influence of microstructural anisotropy on the hydrogen-assisted fracture of notched samples of progressively drawn pearlitic steel Jesús Toribio*, Diego Vergara Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain 1. Introduction Cold drawn pearlitic steel bars are high-performance materials due to their mechanical properties that make them suitable for many structural engineering applications, e.g., as prestressing cables (Perrin et al., 2010). They are frequently affected in service by hydrogen environments causing in the steel a degradation phenomenon known as hydrogen assisted fracture or HAF (Ramadan et al., 2008; Nanninga et al., 2010; Mallick et al., 2013). 1. Introduction Cold drawn pearlitic steel bars are high-performance materials due to their mechanical properties that make them suitable for many structural engineering applications, e.g., as prestressing cables (Perrin et al., 2010). They are frequently affected in service by hydrogen environments causing in the steel a degradation phenomenon known as hydrogen assisted fracture or HAF (Ramadan et al., 2008; Nanninga et al., 2010; Mallick et al., 2013). Keywords: pearlitic steel; notched bars; stress triaxiality; hydrogen-assisted micro-damage; hydrogen-assisted fracture. Keywords: pearlitic steel; notched bars; stress triaxiality; hydrogen-assisted micro-damage; hydrogen-assisted fracture.

* 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 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 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.2020.11.088