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A diffusion-based approach for modelling crack tip behaviour under fatigue-oxidation conditions

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posted on 06.09.2018, 11:28 authored by Rudolph J. Kashinga, Liguo ZhaoLiguo Zhao, Vadim SilberschmidtVadim Silberschmidt, Rong Jiang, Philippa A.S. Reed
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.

Funding

The work was funded by the EPSRC UK (Grants EP/K026844/1 and EP/M000966/1), in collaboration with GE Power, Dstl and Uniper

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

International Journal of Fracture

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.

Publisher

© The Authors. Published by Springer Verlag

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Acceptance date

28/08/2018

Publication date

2018-09-06

Notes

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/

ISSN

0376-9429

Language

en