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

Dong Feng Li, Richard A. Barrett, Padraic E. O'Donoghue, Chris J. Hyde, Noel P. O'Dowd, Sean B. Leen

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)192-202
Number of pages11
JournalInternational Journal of Fatigue
Volume87
DOIs
Publication statusPublished - 1 Jun 2016

Keywords

  • Crystal plasticity
  • Fatigue crack initiation
  • Finite element
  • Tempered martensite ferritic steels
  • Thermo-mechanical fatigue

Fingerprint

Dive into the research topics of 'Micromechanical finite element modelling of thermo-mechanical fatigue for P91 steels'. Together they form a unique fingerprint.

Cite this