Micromechanical finite element modelling of thermo-mechanical fatigue for P91 steels,
Li, Dong-Feng Barrett, Richard A. Leen, Sean B. O'Donoghue, Padraic E.
Li, Dong-Feng
Barrett, Richard A.
Leen, Sean B.
O'Donoghue, Padraic E.
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Repository DOI
Publication Date
2016-01-21
Type
Article
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Citation
Li, D-F, O Donoghue, PE, Hyde, CJ, O Dowd, NP, Leen, SB, (2016) 'Micromechanical finite element modelling of thermo-mechanical fatigue for P91 steels'. International Journal Of Fatigue, Volume 87, June 2016, Pages 192–202
Abstract
In this paper, the cyclic plasticity and fatigue crack initiation behaviour of a tempered martensitic 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 thermomechanical 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.
Funder
Publisher
Elsevier
Publisher DOI
10.1016/j.ijfatigue.2015.11.025
Rights
Attribution-NonCommercial-NoDerivs 3.0 Ireland