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Title: Computational modelling of full interaction between crystal plasticity and oxygen diffusion at a crack tip
Authors: Farukh, Farukh
Zhao, Liguo
Barnard, N.C.
Whittaker, M.T.
McColvin, G.
Keywords: Full coupling
Oxygen diffusion
Crystal plasticity
Finite element method
Crack growth rate
Issue Date: 2017
Publisher: © 2017 The Authors. Published by Elsevier Ltd.
Citation: FARUKH, F. ... et al., 2017. Computational modelling of full interaction between crystal plasticity and oxygen diffusion at a crack tip. Theoretical and Applied Fracture Mechanics, in press, https://doi.org/10.1016/j.tafmec.2017.10.010
Abstract: Oxidation-promoted crack growth, one of the major concerns for nickel-based superalloys, is closely linked to the diffusion of oxygen into the crack tip. The phenomenon is still not well understood yet, especially the full interaction between oxygen diffusion and severe near-tip mechanical deformation. This work aimed at the development of a robust numerical strategy to model the full coupling of crystal plasticity and oxygen diffusion in a single crystal nickel-based superalloy. In order to accomplish this, finite element package ABAQUS is used as a platform to develop a series of user-defined subroutines to model the fully coupled process of deformation and diffusion. The formulation allowed easy incorporation of nonlinear material behaviour, various loading conditions and arbitrary model geometries. Using this method, finite element analyses of oxygen diffusion, coupled with crystal plastic deformation, were carried out to simulate oxygen penetration at a crack tip and associated change of near-tip stress field, which has significance in understanding crack growth acceleration in oxidation environment. Based on fully coupled diffusion-deformation analyses, a case study was carried out to predict crack growth rate in oxidation environment and under dwell-fatigue loading conditions, for which a twoparameter failure criterion, in terms of accumulated inelastic strain and oxygen concentration at the crack tip, has been utilized.
Description: This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
Sponsor: The work was funded by the EPSRC (Grants EP/K026844/1 and EP/ M000966/1) of the UK and in collaboration with Universities of Southampton and Warwick (UK), Nasa, GE Power, Uniper and Dstl.
Version: Published
DOI: 10.1016/j.tafmec.2017.10.010
URI: https://dspace.lboro.ac.uk/2134/27418
Publisher Link: https://doi.org/10.1016/j.tafmec.2017.10.010
ISSN: 0167-8442
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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