Fatigue crack initiation and growth behavior within varying notch geometries in the low-cycle fatigue regime for FV566 turbine blade material

Benjamin M.D. Cunningham; Mitchell Leering; Yuhui Fan; Chao You; Andrew Morris; Philippa A.S. Reed; Andrew R. Hamilton; Michael E. Fitzpatrick

doi:10.1111/ffe.14036

Fatigue crack initiation and growth behavior within varying notch geometries in the low-cycle fatigue regime for FV566 turbine blade material

Benjamin M.D. Cunningham
, Mitchell Leering
, Yuhui Fan
, Chao You
, Andrew Morris
, Philippa A.S. Reed
, Andrew R. Hamilton
, Michael E. Fitzpatrick

University of Southampton
Nanjing University of Aeronautics and Astronautics
EDF Energy

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

217 Downloads (Pure)

Abstract

Plain bend bars made from FV566 martensitic stainless steel were extracted from the root of ex-service power plant turbine blades and several industry-relevant notch geometries were introduced. Some of the samples were shot peened. The notched bend bars were loaded plastically in the low-cycle fatigue regime and finite element (FE) modeling carried out to investigate the effects of changing notch geometry, combined with shot peening, on fatigue behaviors such as crack initiation, short crack growth, and coalescence. Shot peening damaged the notch surface, accelerating initiation behaviors, but had a lifetime-extending effect by retarding short crack growth in all tested notch geometries. At a total strain range higher than 1.2%, the lifetime extension benefit from shot peening was diminished due to compressive residual stress relaxation in the notch stress field. Notch geometry (and the associated varying constraint levels and stress/strain gradients) was found to have no notable difference on fatigue life when tested at identical notch-root strain ranges.

Original language	English
Article number	14036
Pages (from-to)	2845-2863
Number of pages	19
Journal	Fatigue and Fracture of Engineering Materials and Structures
Volume	46
Issue number	8
Early online date	16 May 2023
DOIs	https://doi.org/10.1111/ffe.14036
Publication status	Published - Aug 2023

Bibliographical note

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided
the original work is properly cited.

Funder

Engineering and Physical Sciences Research Council (EPSRC), UK, Grant/Award Number: EP/N509747/1; Natural Science Foundation of Jiangsu Province, Grant/Award Number: BK20210302

Funding

This study is financially supported by the Engineering and Physical Sciences Research Council (EPSRC), UK (Grant EP/N509747/1). The authors would like to acknowledge the funding and support of the University of Southampton. We would also like to thank EDF energy for providing ex‐service blade material and industrial co‐funding for this project. Chao You would like to acknowledge the funding and support from Natural Science Foundation of Jiangsu Province (Grant BK20210302). For the purpose of open access, the author has applied a CC BY public copyright licence to any Author Accepted Manuscript version arising from this submission. Michael E. Fitzpatrick wishes to acknowledge the support of the Lloyd's Register Foundation, a charitable foundation helping protect life and property by supporting engineering‐related education, public engagement, and the application of research.

Funders	Funder number
Lloyd’s Register Foundation
EDF Energy
Engineering and Physical Sciences Research Council	EP/N509747/1
Engineering and Physical Sciences Research Council
University of Southampton
Natural Science Foundation of Jiangsu Province	BK20210302
Natural Science Foundation of Jiangsu Province

Keywords

constant amplitude
low cycle fatigue
notch field
notches
short crack growth
stainless steel

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1111/ffe.14036Licence: CC BY

PublishedFinal published version, 5.98 MBLicence: CC BY

Cite this

Cunningham, B. M. D., Leering, M., Fan, Y., You, C., Morris, A., Reed, P. A. S., Hamilton, A. R., & Fitzpatrick, M. E. (2023). Fatigue crack initiation and growth behavior within varying notch geometries in the low-cycle fatigue regime for FV566 turbine blade material. Fatigue and Fracture of Engineering Materials and Structures, 46(8), 2845-2863. Article 14036. https://doi.org/10.1111/ffe.14036

Fatigue crack initiation and growth behavior within varying notch geometries in the low-cycle fatigue regime for FV566 turbine blade material. / Cunningham, Benjamin M.D.; Leering, Mitchell; Fan, Yuhui et al.
In: Fatigue and Fracture of Engineering Materials and Structures, Vol. 46, No. 8, 14036, 08.2023, p. 2845-2863.

Research output: Contribution to journal › Article › peer-review

Cunningham, BMD, Leering, M, Fan, Y, You, C, Morris, A, Reed, PAS, Hamilton, AR & Fitzpatrick, ME 2023, 'Fatigue crack initiation and growth behavior within varying notch geometries in the low-cycle fatigue regime for FV566 turbine blade material', Fatigue and Fracture of Engineering Materials and Structures, vol. 46, no. 8, 14036, pp. 2845-2863. https://doi.org/10.1111/ffe.14036

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abstract = "Plain bend bars made from FV566 martensitic stainless steel were extracted from the root of ex-service power plant turbine blades and several industry-relevant notch geometries were introduced. Some of the samples were shot peened. The notched bend bars were loaded plastically in the low-cycle fatigue regime and finite element (FE) modeling carried out to investigate the effects of changing notch geometry, combined with shot peening, on fatigue behaviors such as crack initiation, short crack growth, and coalescence. Shot peening damaged the notch surface, accelerating initiation behaviors, but had a lifetime-extending effect by retarding short crack growth in all tested notch geometries. At a total strain range higher than 1.2\%, the lifetime extension benefit from shot peening was diminished due to compressive residual stress relaxation in the notch stress field. Notch geometry (and the associated varying constraint levels and stress/strain gradients) was found to have no notable difference on fatigue life when tested at identical notch-root strain ranges.",

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AU - Hamilton, Andrew R.

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Fatigue crack initiation and growth behavior within varying notch geometries in the low-cycle fatigue regime for FV566 turbine blade material

Abstract

Bibliographical note

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Funding

Keywords

ASJC Scopus subject areas

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