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A phase field formulation for hydrogen assisted cracking

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Title: A phase field formulation for hydrogen assisted cracking
Authors: Martinez-Paneda, E
Golahmar, A
Niordson, CF
Item Type: Journal Article
Abstract: We present a phase field modeling framework for hydrogen assisted cracking. The model builds upon a coupled mechanical and hydrogen diffusion response, driven by chemical potential gradients, and a hydrogen-dependent fracture energy degradation law grounded on first principles calculations. The coupled problem is solved in an implicit time integration scheme, where displacements, phase field order parameter and hydrogen concentration are the primary variables. We show that phase field formulations for fracture are particularly suitable to capture material degradation due to hydrogen. Specifically, we model (i) unstable crack growth in the presence of hydrogen, (ii) failure stress sensitivity to hydrogen content in notched specimens, (iii) cracking thresholds under constant load, (iv) internal hydrogen assisted fracture in cracked specimens, and (v) complex crack paths arising from corrosion pits. Computations reveal a good agreement with experiments, highlighting the predictive capabilities of the present scheme. The work could have important implications for the prediction and prevention of catastrophic failures in corrosive environments. The finite element code developed can be downloaded from www.empaneda.com/codes.
Issue Date: 1-Dec-2018
Date of Acceptance: 19-Jul-2018
URI: http://hdl.handle.net/10044/1/73423
DOI: https://dx.doi.org/10.1016/j.cma.2018.07.021
ISSN: 0045-7825
Publisher: Elsevier
Start Page: 742
End Page: 761
Journal / Book Title: Computer Methods in Applied Mechanics and Engineering
Volume: 342
Copyright Statement: © 2018 Elsevier B.V. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology
Technology
Physical Sciences
Engineering, Multidisciplinary
Mathematics, Interdisciplinary Applications
Mechanics
Engineering
Mathematics
Phase field
Hydrogen embrittlement
Stress-assisted diffusion
Finite element analysis
Fracture
STRAIN GRADIENT PLASTICITY
COHESIVE ZONE SIMULATION
BRITTLE-FRACTURE
STRENGTH PREDICTION
EMBRITTLEMENT
MODEL
METALS
STEEL
PRINCIPLES
DIFFUSION
Science & Technology
Technology
Physical Sciences
Engineering, Multidisciplinary
Mathematics, Interdisciplinary Applications
Mechanics
Engineering
Mathematics
Phase field
Hydrogen embrittlement
Stress-assisted diffusion
Finite element analysis
Fracture
STRAIN GRADIENT PLASTICITY
COHESIVE ZONE SIMULATION
BRITTLE-FRACTURE
STRENGTH PREDICTION
EMBRITTLEMENT
MODEL
METALS
STEEL
PRINCIPLES
DIFFUSION
math.NA
math.NA
Applied Mathematics
01 Mathematical Sciences
09 Engineering
Publication Status: Published
Online Publication Date: 2018-07-25
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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