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A lifing method based on R5 and viscoplasticity modelling and its application to turbine rotor under thermomechanical loading

Bonetti, Rossella; Hadjipakkos, P.; Rae, Yarik; Hughes, Jeremy; Sun, W.

Authors

Rossella Bonetti

P. Hadjipakkos

Yarik Rae

Jeremy Hughes

W. Sun



Contributors

Rossella Bonetti
Researcher

Abstract

An integrated life assessment procedure for structures operating under thermomechanical loading has been
developed. The methodology uses a viscoplasticity based framework combined with the R5 life assessment code. The
viscoplastic constitutive model used for the stress-strain analysis is derived from the Chaboche-Lemaitre formulation
that allows to directly obtain the required parameters for the R5 assessment as stress relaxation per cycle and the
elastic follow-up factor. The R5 procedure is therefore significantly simplified. The proposed life assessment procedure
is demonstrated on a martensitic steel (FV566) industrial gas turbine rotor under a typical start up – shut down
operation. The effect of creep-fatigue interaction at different locations within the rotor structure is assessed and the
remaining life at each location is calculated. A sensitivity study is performed at half load, which shows an increase in
lifetime of the rotor.

Citation

Rae, Y., Hughes, J., Bonetti, R., Bonetti, R., Hadjipakkos, P., Rae, Y., …Sun, W. (2020). A lifing method based on R5 and viscoplasticity modelling and its application to turbine rotor under thermomechanical loading. Engineering Failure Analysis, 110, https://doi.org/10.1016/j.engfailanal.2020.104416

Journal Article Type Article
Acceptance Date Jan 27, 2020
Online Publication Date Jan 28, 2020
Publication Date 2020-03
Deposit Date Jan 28, 2020
Publicly Available Date Jan 29, 2021
Journal Engineering Failure Analysis
Print ISSN 1350-6307
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 110
Article Number 104416
DOI https://doi.org/10.1016/j.engfailanal.2020.104416
Keywords General Engineering; General Materials Science
Public URL https://nottingham-repository.worktribe.com/output/3821350
Publisher URL https://www.sciencedirect.com/science/article/pii/S1350630719313925
Additional Information This article is maintained by: Elsevier; Article Title: A lifing method based on R5 and viscoplasticity modelling and its application to turbine rotor under thermomechanical loading; Journal Title: Engineering Failure Analysis; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.engfailanal.2020.104416; Content Type: article; Copyright: © 2020 Elsevier Ltd. All rights reserved.