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

Numerical modelling of the fatigue crack shape evolution in a shot-peened steam turbine material
Numerical modelling of the fatigue crack shape evolution in a shot-peened steam turbine material
In 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.
0142-1123
120–135
You, Chao
1970d34b-ab33-4098-9363-2df30f36dda1
He, Binyan
0c154394-797d-42ad-b812-3fbbaea0238a
Achintha, Mithila
8163c322-de6d-4791-bc31-ba054cc0e07d
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17
You, Chao
1970d34b-ab33-4098-9363-2df30f36dda1
He, Binyan
0c154394-797d-42ad-b812-3fbbaea0238a
Achintha, Mithila
8163c322-de6d-4791-bc31-ba054cc0e07d
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17

You, Chao, He, Binyan, Achintha, Mithila and Reed, Philippa (2017) Numerical modelling of the fatigue crack shape evolution in a shot-peened steam turbine material. International Journal of Fatigue, 104, 120–135. (doi:10.1016/j.ijfatigue.2017.07.017).

Record type: Article

Abstract

In 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.

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Accepted/In Press date: 15 July 2017
e-pub ahead of print date: 17 July 2017
Published date: November 2017

Identifiers

Local EPrints ID: 412743
URI: http://eprints.soton.ac.uk/id/eprint/412743
ISSN: 0142-1123
PURE UUID: 817494c8-f820-4227-b775-5332117afbf9
ORCID for Chao You: ORCID iD orcid.org/0000-0003-0118-0771
ORCID for Mithila Achintha: ORCID iD orcid.org/0000-0002-1732-3514
ORCID for Philippa Reed: ORCID iD orcid.org/0000-0002-2258-0347

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Date deposited: 28 Jul 2017 16:30
Last modified: 07 Oct 2020 05:16

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Contributors

Author: Chao You ORCID iD
Author: Binyan He
Author: Philippa Reed ORCID iD

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