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Generalised boundary conditions for hydrogen transport at crack tips

Martínez-Pañeda, E; Díaz, A; Wright, L; Turnbull, A (2020) Generalised boundary conditions for hydrogen transport at crack tips. Corrosion Science, 173. p. 108698. ISSN 0010938X

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We present a generalised framework for resolving the electrochemistry-diffusion interface and modelling hydrogen transport near a crack tip. The adsorption and absorption kinetics are captured by means of Neumann-type generalised boundary conditions. The diffusion model includes the role of trapping, with a constant or evolving trap density, and the influence of the hydrostatic stress. Both conventional plasticity and strain gradient plasticity are used to model the mechanical behaviour of the solid. Notable differences are found in the estimated crack tip hydrogen concentrations when comparing with the common procedure of prescribing a constant hydrogen concentration at the crack surfaces.

Item Type: Article
Keywords: Hydrogen, Diffusion, Finite element analysis, Environmentally assisted cracking, Trapping
Subjects: Advanced Materials > Corrosion
Divisions: Electromagnetic & Electrochemical Technologies
Identification number/DOI: 10.1016/j.corsci.2020.108698
Last Modified: 27 Oct 2020 15:42
URI: http://eprintspublications.npl.co.uk/id/eprint/8938

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