Generalised boundary conditions for hydrogen transport at crack tips

Martínez‐Pañeda, Emilio; Díaz, Andrés; Wright, L; Turnbull, A.

doi:10.1016/j.corsci.2020.108698

Cited by 51 publications

(22 citation statements)

References 61 publications

(117 reference statements)

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“…in Refs. [30,31] [32,33] and the use of strain gradient plasticity models reveals: (i) the existence of an elastic core surrounding the crack tip [34,35], and (ii) a crack tip stress distribution over the fracture process zone that is closer to that of linear elasticity [36,37]. Thus, linear elasticity provides a conservative, less computationally demanding alternative to multi-scale plasticity models.…”

Section: Potential Energy Of the Solidmentioning

confidence: 99%

Applications of phase field fracture in modelling hydrogen assisted failures

Kristensen

Niordson

Martínez‐Pañeda

2020

Theoretical and Applied Fracture Mechanics

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The phase field fracture method has emerged as a promising computational tool for modelling a variety of problems including, since recently, hydrogen embrittlement and stress corrosion cracking. In this work, we demonstrate the potential of phase field-based multi-physics models in transforming the engineering assessment and design of structural components in hydrogencontaining environments. First, we present a theoretical and numerical framework coupling deformation, diffusion and fracture, which accounts for inertia effects.Several constitutive choices are considered for the crack density function, including choices with and without an elastic phase in the damage response. The material toughness is defined as a function of the hydrogen content using an atomistically-informed hydrogen degradation law. The model is numerically implemented in 2D and 3D using the finite element method. The resulting computational framework is used to address a number of case studies of particular engineering interest. These are intended

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Section: Potential Energy Of the Solidmentioning

confidence: 99%

Applications of phase field fracture in modelling hydrogen assisted failures

Kristensen

Niordson

Martínez‐Pañeda

2020

Theoretical and Applied Fracture Mechanics

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“…These assumptions are supported by a recent paper by Martinez-Paneda et al 44 (MDWT) who developed a computational model for the effect of "generalized" fluxboundary conditions, trapping rates, and strain gradient plasticity (SGP) on the hydrogen concentration at crack tips. They found three orders of magnitude increase in crack tip hydrogen concentration relative to the usual constant concentration assumed in diffusion-limited models.…”

Section: Fr/he Model Rate-limited By Hydrogen Fluxmentioning

confidence: 95%

Synergism between fatigue and cyclic‐stress corrosion cracking: Electrochemically active surface area

Hall¹

2021

Fatigue Fract Eng Mat Struct

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After over 50 years of research on the topic, researchers continue to consider how time-dependent environmental effects can be integrated with cycledependent fatigue crack growth rate (CGR) models. Early corrosion-fatigue (CF) model assumptions were that cycle-dependent CF and time-dependent stress corrosion cracking (SCC) contributions are separable, operate in parallel, are non-interacting. However, research has shown that CF and SCC may interact synergistically to produce CGRs greater than that obtained by simple summation. Proposed here is that CF and SCC mechanisms may interact synergistically as each is dependent on the electrochemically active surface area (E-ASA) at a crack tip. A phenomenological model is developed for the effects of crack tip strain rate, film-rupture, and repassivation rates on E-ASA. Analysis of hold-time CGR data provides a method of separating cyclic-and static-load hold-time effects on E-ASA. Five model parameters, each having physical interpretation, are found to have reasonable magnitudes.

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“…Models have been presented that provide as input the lattice chemical potential [46][47][48][49], a more rigorous approach than prescribing a constant hydrogen concentration. More importantly, a new generalised formulation has been proposed to resolve the electrochemistry-diffusion interface, enabling quantifying the flux of hydrogen from the local pH and overpotential [50]. These generalised boundary conditions not only provide a more accurate description of hydrogen ingress but also open the door to the development of a new generation of fully predictive electro-chemomechanical models, which explicitly resolve the crack tip electrochemistry (stages 1 to 3).…”

Section: Hydrogen Embrittlementmentioning

confidence: 99%

Progress and opportunities in modelling environmentally assisted cracking

Martínez‐Pañeda

2021

RILEM Tech Lett

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Environmentally assisted cracking phenomena are widespread across the transport, defence, energy and construction sectors. However, predicting environmentally assisted fractures is a highly cross-disciplinary endeavour that requires resolving the multiple material-environment interactions taking place. In this manuscript, an overview is given of recent breakthroughs in the modelling of environmentally assisted cracking. The focus is on the opportunities created by two recent developments: phase field and multi-physics modelling. The possibilities enabled by the confluence of phase field methods and electro-chemo-mechanics modelling are discussed in the context of three environmental assisted cracking phenomena of particular engineering interest: hydrogen embrittlement, localised corrosion and corrosion fatigue. Mechanical processes such as deformation and fracture can be coupled with chemical phenomena like local reactions, ionic transport and hydrogen uptake and diffusion. Moreover, these can be combined with the prediction of an evolving interface, such as a growing pit or a crack, as dictated by a phase field variable that evolves based on thermodynamics and local kinetics. Suitable for both microstructural and continuum length scales, this new generation of simulation-based, multi-physics phase field models can open new modelling horizons and enable Virtual Testing in harmful environments.

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Generalised boundary conditions for hydrogen transport at crack tips

Cited by 51 publications

References 61 publications

Applications of phase field fracture in modelling hydrogen assisted failures

Applications of phase field fracture in modelling hydrogen assisted failures

Synergism between fatigue and cyclic‐stress corrosion cracking: Electrochemically active surface area

Progress and opportunities in modelling environmentally assisted cracking

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