TY - JOUR
T1 - Micromechanical finite element modelling of thermo-mechanical fatigue for P91 steels
AU - Li, Dong Feng
AU - Barrett, Richard A.
AU - O'Donoghue, Padraic E.
AU - Hyde, Chris J.
AU - O'Dowd, Noel P.
AU - Leen, Sean B.
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2016/6/1
Y1 - 2016/6/1
N2 - 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.
AB - 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.
KW - Crystal plasticity
KW - Fatigue crack initiation
KW - Finite element
KW - Tempered martensite ferritic steels
KW - Thermo-mechanical fatigue
UR - http://www.scopus.com/inward/record.url?scp=84958534827&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2015.11.025
DO - 10.1016/j.ijfatigue.2015.11.025
M3 - Article
AN - SCOPUS:84958534827
SN - 0142-1123
VL - 87
SP - 192
EP - 202
JO - International Journal of Fatigue
JF - International Journal of Fatigue
ER -