PSI - Issue 59

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ScienceDirect

Procedia Structural Integrity 59 (2024) 145–150

VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Notch tip hydrogen diffusion assisted by stress and strain fields and its role in hydrogen assisted fracture VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Notch tip hydrogen diffusion assisted by stress and strain fields and its role in hydrogen assisted fracture

Jesús Toribio * , Beatriz González and 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 and Juan -Carlos Matos Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain

© 2024 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 DMDP 2023 Organizers © 2024 The Auth ors. 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 DMDP 2023 Organizers Abstract This paper offers a numerical approach to the problem of hydrogen embrittlement and notch tensile strength of pearlitic steel in the presence of sharp and blunt notches by using the finite element method to determine how the notch geometry influences the notch-tip hydrogen diffusion affected by stress and strain fields in the steady-state regime for different loading values. Numerical results show that the point of maximum hydrostatic stress (towards which hydrogen is transported by a mechanism of stress assisted diffusion) shifts from the notch tip to the inner points of the specimen under increasing load, with numerical evidence of an elevated inwards gradient of hydrostatic stress promoting stress-assisted hydrogen diffusion, thereby increasing the hydrogen concentration in the vicinity of the notch tip. © 2024 The Auth ors. 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 DMDP 2023 Organizers Abstract This paper offers a numerical approach to the problem of hydrogen embrittlement and notch tensile strength of pearlitic steel in the presence of sharp and blunt notches by using the finite element method to determine how the notch geometry influences the notch-tip hydrogen diffusion affected by stress and strain fields in the steady-state regime for different loading values. Numerical results show that the point of maximum hydrostatic stress (towards which hydrogen is transported by a mechanism of stress assisted diffusion) shifts from the notch tip to the inner points of the specimen under increasing load, with numerical evidence of an elevated inwards gradient of hydrostatic stress promoting stress-assisted hydrogen diffusion, thereby increasing the hydrogen concentration in the vicinity of the notch tip. Keywords: round notched specimen; numerical modeling; stress-assisted hydrogen diffusion; hydrostatic stress; hydrogen concentration. Keywords: round notched specimen; numerical modeling; stress-assisted hydrogen diffusion; hydrostatic stress; hydrogen concentration.

* 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 © 2024 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 DMDP 2023 Organizers 2452-3216 © 2024 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 DMDP 2023 Organizers

2452-3216 © 2024 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 DMDP 2023 Organizers 10.1016/j.prostr.2024.04.022