A diffusion-based approach for modelling crack tip behaviour under fatigue-oxidation conditions
A diffusion-based approach for modelling crack tip behaviour under fatigue-oxidation conditions
Modelling of crack tip behaviour was carried out for a nickel-based superalloy subjected to high temperature fatigue in a vacuum and air. In a 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.
Accumulated plastic strain, Crack-tip behaviour, Diffusion analysis, Finite element, Oxygen penetration
Kashinga, R. J.
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Zhao, L. G.
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Silberschmidt, V. V.
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Jiang, R.
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Reed, P. A.S.
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Kashinga, R. J.
810495c9-7dd0-4d10-a689-660ab651317b
Zhao, L. G.
cde8eb88-e174-4920-9a30-e352cc6f5094
Silberschmidt, V. V.
8c5140b2-96fe-4eb3-8851-276b0230578a
Jiang, R.
1e3a7913-c354-4ecb-879c-526cb6fe5fcd
Reed, P. A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Kashinga, R. J., Zhao, L. G., Silberschmidt, V. V., Jiang, R. and Reed, P. A.S.
(2018)
A diffusion-based approach for modelling crack tip behaviour under fatigue-oxidation conditions.
International Journal of Fracture.
(doi:10.1007/s10704-018-0311-x).
Abstract
Modelling of crack tip behaviour was carried out for a nickel-based superalloy subjected to high temperature fatigue in a vacuum and air. In a 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.
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Kashinga2018_Article_ADiffusion-basedApproachForMod
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Accepted/In Press date: 29 August 2018
e-pub ahead of print date: 6 September 2018
Keywords:
Accumulated plastic strain, Crack-tip behaviour, Diffusion analysis, Finite element, Oxygen penetration
Identifiers
Local EPrints ID: 423758
URI: http://eprints.soton.ac.uk/id/eprint/423758
ISSN: 0376-9429
PURE UUID: 66bdaa23-2182-43a7-9f25-f8a3deb49d35
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Date deposited: 01 Oct 2018 16:30
Last modified: 16 Mar 2024 02:44
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Contributors
Author:
R. J. Kashinga
Author:
L. G. Zhao
Author:
V. V. Silberschmidt
Author:
R. Jiang
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