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Computational modelling of full interaction between crystal plasticity and oxygen diffusion at a crack tip

F. Farukh, L.G. Zhao, N.C. Barnard, M.T. Whittaker, G. McColvin, Mark Whittaker Orcid Logo

Theoretical and Applied Fracture Mechanics

Swansea University Author: Mark Whittaker Orcid Logo

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DOI (Published version): 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 deformati...

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Published in: Theoretical and Applied Fracture Mechanics
ISSN: 0167-8442
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa36757
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first_indexed 2017-11-13T20:20:15Z
last_indexed 2018-02-09T05:29:25Z
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spelling 2017-11-13T15:02:55.7186577 v2 36757 2017-11-13 Computational modelling of full interaction between crystal plasticity and oxygen diffusion at a crack tip a146c6d442cb2c466d096179f9ac97ca 0000-0002-5854-0726 Mark Whittaker Mark Whittaker true false 2017-11-13 MTLS 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 two-parameter failure criterion, in terms of accumulated inelastic strain and oxygen concentration at the crack tip, has been utilized. Journal Article Theoretical and Applied Fracture Mechanics 0167-8442 Full coupling; Oxygen diffusion; Crystal plasticity; Finite element method; Crack growth rate 31 12 2017 2017-12-31 10.1016/j.tafmec.2017.10.010 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2017-11-13T15:02:55.7186577 2017-11-13T15:00:17.8917251 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering F. Farukh 1 L.G. Zhao 2 N.C. Barnard 3 M.T. Whittaker 4 G. McColvin 5 Mark Whittaker 0000-0002-5854-0726 6 0036757-13112017150247.pdf farukh2017.pdf 2017-11-13T15:02:47.0930000 Output 1753263 application/pdf Proof true 2017-11-13T00:00:00.0000000 false eng
title Computational modelling of full interaction between crystal plasticity and oxygen diffusion at a crack tip
spellingShingle Computational modelling of full interaction between crystal plasticity and oxygen diffusion at a crack tip
Mark Whittaker
title_short Computational modelling of full interaction between crystal plasticity and oxygen diffusion at a crack tip
title_full Computational modelling of full interaction between crystal plasticity and oxygen diffusion at a crack tip
title_fullStr Computational modelling of full interaction between crystal plasticity and oxygen diffusion at a crack tip
title_full_unstemmed Computational modelling of full interaction between crystal plasticity and oxygen diffusion at a crack tip
title_sort Computational modelling of full interaction between crystal plasticity and oxygen diffusion at a crack tip
author_id_str_mv a146c6d442cb2c466d096179f9ac97ca
author_id_fullname_str_mv a146c6d442cb2c466d096179f9ac97ca_***_Mark Whittaker
author Mark Whittaker
author2 F. Farukh
L.G. Zhao
N.C. Barnard
M.T. Whittaker
G. McColvin
Mark Whittaker
format Journal article
container_title Theoretical and Applied Fracture Mechanics
publishDate 2017
institution Swansea University
issn 0167-8442
doi_str_mv 10.1016/j.tafmec.2017.10.010
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description 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 two-parameter failure criterion, in terms of accumulated inelastic strain and oxygen concentration at the crack tip, has been utilized.
published_date 2017-12-31T03:46:06Z
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score 11.035634

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