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Title: A diffusion-based approach for modelling crack tip behaviour under fatigue-oxidation conditions
Authors: Kashinga, Rudolph J.
Zhao, Liguo
Silberschmidt, Vadim V.
Jiang, Rong
Reed, Philippa A.S.
Keywords: Crack-tip behaviour
Accumulated plastic strain
Oxygen penetration
Finite element
Diffusion analysis
Issue Date: 2018
Publisher: © The Authors. Published by Springer Verlag
Citation: KASHINGA, R.J. ... et al., 2018. A diffusion-based approach for modelling crack tip behaviour under fatigue-oxidation conditions. International Journal of Fracture, 213 (2), pp.157–170.
Abstract: Modelling of crack tip behaviour was carried out for a nickel-based superalloy subjected to high temperature fatigue in vacuum and air. In vacuum, crack growth was entirely due to mechanical deformation and thus it was sufficient to use accumulated plastic strain as a criterion. To study the strong effect of oxidation in air, a diffusion-based approach was applied to investigate the full interaction between fatigue and oxygen penetration at a crack tip. Penetration of oxygen into the crack tip induced a local compressive stress due to dilatation effect. An increase in stress intensity factor range or dwell times imposed at peak loads resulted in enhanced accumulation of oxygen at the crack tip. A crack growth criterion based on accumulated levels of oxygen and plastic strain at the crack tip was subsequently developed to predict the crack growth rate under fatigue-oxidation conditions. The predicted crack-growth behaviour compared well with experimental results.
Description: This is an Open Access Article. It is published by Springer under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
Sponsor: The work was funded by the EPSRC UK (Grants EP/K026844/1 and EP/M000966/1), in collaboration with GE Power, Dstl and Uniper
Version: Published
DOI: 10.1007/s10704-018-0311-x
URI: https://dspace.lboro.ac.uk/2134/34737
Publisher Link: https://doi.org/10.1007/s10704-018-0311-x
ISSN: 0376-9429
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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