RT info:eu-repo/semantics/article T1 Generalised boundary conditions for hydrogen transport at crack tips A1 Martínez Pañeda, Emilio A1 Díaz Portugal, Andrés A1 Wright, Louise A1 Turnbull, Alan K1 Hydrogen K1 Diffusion K1 Finite element analysis K1 Environmentally assisted cracking K1 Trapping K1 Resistencia de materiales K1 Strength of materials AB 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. PB Elsevier SN 0010-938X YR 2020 FD 2020-08 LK http://hdl.handle.net/10259/5666 UL http://hdl.handle.net/10259/5666 LA eng NO E. Martínez-Pañeda acknowledges financial support from EPSRC funding under grant no.EP/R010161/1, from the UKCRIC Coordination Node EPSRC grant number EP/R017727/1, which funds UKCRIC's ongoing coordination, and from Wolfson College Cambridge (Junior Research Fellowship). A. Díaz gratefully acknowledges financial support from the Ministry of Science, Innovation and Universities of Spain through grant RTI2018-096070-B-C33. DS Repositorio Institucional de la Universidad de Burgos RD 29-mar-2024