Peer-Reviewed Journal Details
Mandatory Fields
Li, DF,Barrett, RA,O'Donoghue, PE,Hyde, CJ,O'Dowd, NP,Leen, SB
International Journal Of Fatigue
Micromechanical finite element modelling of thermo-mechanical fatigue for P91 steels
WOS: 11 ()
Optional Fields
Tempered martensite ferritic steels Thermo-mechanical fatigue Crystal plasticity Fatigue crack initiation Finite element LOW-CYCLE FATIGUE PLASTICITY FE SIMULATIONS CRACK NUCLEATION HIGH-TEMPERATURE CONSTITUTIVE MODEL LENGTH-SCALE TI ALLOYS DEFORMATION LIFE EVOLUTION
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 therme-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. (C) 2015 Elsevier Ltd. All rights reserved.
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