PSI - Issue 80

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ScienceDirect

Procedia Structural Integrity 80 (2026) 187–194 Structural Integrity Procedia 00 (2023) 000–000 Structural Integrity Procedia 00 (2023) 000–000

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© 2025 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 Ferri Aliabadi Abstract Hydrogen-assisted cracking (HAC), particularly sulfide stress cracking (SSC) in sour environments, threatens the structural in tegrity of critical components. While a prior model developed by the authors have addressed temperature-dependent hydrogen di ff usion and fracture energy degradation within an elastic phase-field framework, the influence of plastic deformation remains underexplored. This work enhances the developed chemo-thermo-mechanical phase-field model by incorporating standard elasto plasticity and a coupling mechanism where plastic work partially drives fracture. The formulation accounts for temperature-induced stress, hydrogen-induced toughness degradation, and di ff usion kinetics. Validation is performed using DCB simulations of P110 steel under sour conditions across various temperatures, benchmarked against experimental data. Both the elastic and elasto-plastic models capture the observed rise in the SSC threshold K ISSC with temperature, while the elasto-plastic variant predicts slightly more accurate thresholds. For the SSC conditions examined, plasticity had a limited impact on macroscopic behavior, with temperature dependent transport and degradation being the dominant factors. The proposed model o ff ers a more complete tool for HAC analysis and can support future studies where plasticity plays a larger role. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of Professor Ferri Aliabadi. Keywords: Hydrogen embrittlement; SSC; Finite element analysis; Phase field; Thermal e ff ects; Fracture Fracture, Damage and Structural Health Monitoring Chemo-Thermo-Mechanical Phase Field Modeling of Sulfide Stress Cracking in DCB Testing and E ff ect of Plasticity M. Elkhodbia a , I. Barsoum a,b,c, ∗ a Department of Mechanical and Nuclear Engineering, Khalifa University, Abu Dhabi, 127788, United Arab Emirates b Department of Engineering Mechanics, Royal Institute of Technology – KTH, Stockholm, 100 44, Sweden c Advanced Digital & Additive Manufacturing Research Centre, Khalifa University, Abu Dhabi, 127788, United Arab Emirates Abstract Hydrogen-assisted cracking (HAC), particularly sulfide stress cracking (SSC) in sour environments, threatens the structural in tegrity of critical components. While a prior model developed by the authors have addressed temperature-dependent hydrogen di ff usion and fracture energy degradation within an elastic phase-field framework, the influence of plastic deformation remains underexplored. This work enhances the developed chemo-thermo-mechanical phase-field model by incorporating standard elasto plasticity and a coupling mechanism where plastic work partially drives fracture. The formulation accounts for temperature-induced stress, hydrogen-induced toughness degradation, and di ff usion kinetics. Validation is performed using DCB simulations of P110 steel under sour conditions across various temperatures, benchmarked against experimental data. Both the elastic and elasto-plastic models capture the observed rise in the SSC threshold K ISSC with temperature, while the elasto-plastic variant predicts slightly more accurate thresholds. For the SSC conditions examined, plasticity had a limited impact on macroscopic behavior, with temperature dependent transport and degradation being the dominant factors. The proposed model o ff ers a more complete tool for HAC analysis and can support future studies where plasticity plays a larger role. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of Professor Ferri Aliabadi. Keywords: Hydrogen embrittlement; SSC; Finite element analysis; Phase field; Thermal e ff ects; Fracture Fracture, Damage and Structural Health Monitoring Chemo-Thermo-Mechanical Phase Field Modeling of Sulfide Stress Cracking in DCB Testing and E ff ect of Plasticity M. Elkhodbia a , I. Barsoum a,b,c, ∗ a Department of Mechanical and Nuclear Engineering, Khalifa University, Abu Dhabi, 127788, United Arab Emirates b Department of Engineering Mechanics, Royal Institute of Technology – KTH, Stockholm, 100 44, Sweden c Advanced Digital & Additive Manufacturing Research Centre, Khalifa University, Abu Dhabi, 127788, United Arab Emirates

1. Introduction 1. Introduction

The growing global demand for oil and gas has driven the expansion of infrastructure into environments with high pressure, elevated temperatures, and corrosive sour media Elkhodbia et al. (2023). These conditions elevate the risk of environmentally assisted failures such as Hydrogen-Assisted Cracking (HAC), especially Sulfide Stress Cracking (SSC), which is driven by tensile stress in the presence of hydrogen sulfide (H 2 S). SSC initiates when atomic hydrogen, generated from H 2 S dissociation, di ff uses into steel and interacts with microstructural features, impairing ductility The growing global demand for oil and gas has driven the expansion of infrastructure into environments with high pressure, elevated temperatures, and corrosive sour media Elkhodbia et al. (2023). These conditions elevate the risk of environmentally assisted failures such as Hydrogen-Assisted Cracking (HAC), especially Sulfide Stress Cracking (SSC), which is driven by tensile stress in the presence of hydrogen sulfide (H 2 S). SSC initiates when atomic hydrogen, generated from H 2 S dissociation, di ff uses into steel and interacts with microstructural features, impairing ductility

∗ Corresponding author E-mail address: imad.barsoum@ku.ac.ae ∗ Corresponding author E-mail address: imad.barsoum@ku.ac.ae

2452-3216 © 2025 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 Ferri Aliabadi 10.1016/j.prostr.2026.02.018 2210-7843 © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of Professor Ferri Aliabadi. 2210-7843 © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of Professor Ferri Aliabadi.