Numerical modelling of the fatigue crack shape evolution in a shot-peened steam turbine material

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dc.contributor.authorYou, Chao
dc.contributor.authorHe, B. Y.
dc.contributor.authorAchintha, M.
dc.contributor.authorReed, P. A. S.
dc.date.accessioned2018-05-09T09:09:20Z
dc.date.available2018-05-09T09:09:20Z
dc.date.issued2017-07-17
dc.description.abstractIn this study, the short crack initiation and growth behaviour in a notched sample under low-cycle fatigue (LCF) was investigated in a low-pressure steam turbine material. Different crack initiation mechanisms and crack shape evolution processes were experimentally observed in samples subjected to different surface treatments: polished, T0 (industrially applied shot peening process) and T1 (a less intense shot peening process). To better understand the effects of shot peening on fatigue, a 3D finite element (FE) model was developed to investigate the interaction between crack growth and the effects induced by shot peening. Firstly, residual stress redistribution caused by both mechanical loading and the presence of a crack was numerically investigated. This model was also used to successfully predict the differences in crack shape evolution between varying surface conditions, and quantified the retardation of short crack growth behaviour resulting from shot peening. Finally, the 3D model introduced in this study was compared with a previously developed 2D model with plane strain assumptions to demonstrate the limitation of the 2D model in simulating the crack growth behaviour, and to emphasise the importance of taking the 3D crack shape into account when evaluating the short crack growth behaviour.en_UK
dc.identifier.citationYou C, He BY, Achintha M, Reed PAS. (2017) Numerical modelling of the fatigue crack shape evolution in a shot-peened steam turbine material, International Journal of Fatigue, Volume 104, November 2017, pp. 120-135en_UK
dc.identifier.issn0142-1123
dc.identifier.urihttp://dx.doi.org/10.1016/j.ijfatigue.2017.07.017
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/13193
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectShot peeningen_UK
dc.subjectResidual stressen_UK
dc.subjectShort cracken_UK
dc.subjectCrack shapeen_UK
dc.subjectFinite element modellingen_UK
dc.titleNumerical modelling of the fatigue crack shape evolution in a shot-peened steam turbine materialen_UK
dc.typeArticleen_UK

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