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Micromechanical finite element modelling of thermo-mechanical fatigue for P91 steels


Dong-Feng Li

Richard A. Barrett

Padraic E.

Christopher J. Hyde

Noel P.

Sean B. Leen


In this paper, the cyclic plasticity and fatigue crack initiation behaviour of a tempered martensite ferritic steel under thermo-mechanical fatigue conditions is examined by means of micromechanical finite element modelling. The crystal plasticity-based model explicitly reflects the microstructure of the material, measured by electronic backscatter diffraction. The predicted cyclic thermo-mechanical response agrees well with experiments under both in-phase and out-of-phase conditions. A thermo-mechanical fatigue indicator parameter, with stress triaxiality and temperature taken into account, is developed to predict fatigue crack initiation. In the fatigue crack initiation simulation, the out-of-phase thermo-mechanical response is identified to be more dangerous than in-phase response, which is consistent with experimental failure data. It is shown that the behaviour of thermo-mechanical fatigue can be effectively predicted at the microstructural level and this can lead to a more accurate assessment procedure for power plant components.


Li, D., Barrett, R. A., O’Donoghue, P. E., Hyde, C. J., O’Dowd, N. P., & Leen, S. B. (2016). Micromechanical finite element modelling of thermo-mechanical fatigue for P91 steels. International Journal of Fatigue, 87,

Journal Article Type Article
Acceptance Date Nov 25, 2015
Online Publication Date Jan 21, 2016
Publication Date Jun 4, 2016
Deposit Date Jul 29, 2016
Publicly Available Date Jul 29, 2016
Journal International Journal of Fatigue
Print ISSN 0142-1123
Electronic ISSN 0142-1123
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 87
Keywords Tempered martensite ferritic steels; Thermo-mechanical fatigue; Crystal plasticity; Fatigue crack initiation; Finite element
Public URL
Publisher URL


22 Li - Int J Fatigue 2016 - eprints.pdf (1.3 Mb)

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