The University of Southampton
University of Southampton Institutional Repository

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
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
0376-9429
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.
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).

Record type: Article

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.

Text
Kashinga2018_Article_ADiffusion-basedApproachForMod - Version of Record
Available under License Creative Commons Attribution.
Download (2MB)

More information

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
ORCID for P. A.S. Reed: ORCID iD orcid.org/0000-0002-2258-0347

Catalogue record

Date deposited: 01 Oct 2018 16:30
Last modified: 20 Jul 2019 01:21

Export record

Altmetrics

Contributors

Author: R. J. Kashinga
Author: L. G. Zhao
Author: V. V. Silberschmidt
Author: R. Jiang
Author: P. A.S. Reed ORCID iD

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×