Abstract
In this paper, the effect of creep-fatigue loading condition on crack tip deformation and stress fields of Grade 91 steel at 600 °C at crack initiation and growth is studied. By using finite element debond analysis method, creep-fatigue crack growth tests using C(T) specimens under various load ratios and hold times are simulated, and the effect of creep-fatigue load ratio and hold time on the crack opening profile, equivalent stress, crack-opening stress and triaxiality at crack initiation and growth is presented. It is found that the crack tip deformation and stress fields under tension–compression creep-fatigue loading are overall different from those under tension-tension creep-fatigue and pure creep loading, due to re-sharpening of the crack tip.
Original language | English |
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Pages (from-to) | 127-135 |
Number of pages | 9 |
Journal | International Journal of Fracture |
Volume | 231 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2021 Sept |
Keywords
- Crack growth
- Crack initiation
- Crack tip stress fields
- Creep fatigue
ASJC Scopus subject areas
- Computational Mechanics
- Modelling and Simulation
- Mechanics of Materials