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- Title
A frequency‐dependent high‐cycle fatigue damage model and its application in crack nucleation of marine riser from corrosion pits.
- Authors
Yin, Zhiming; Li, Zhong; Longchi, Zhou; Wang, Yichao; Huang, Xiaoguang
- Abstract
Based on the continuum damage mechanics theory, a frequency‐dependent high‐cycle fatigue damage evolution model was established. According to the fatigue results of API X80 steel, the frequency‐dependent damage evolution parameters were regressed. Using the available riser mechanical model, the user subroutine of high‐cycle fatigue damage evolution was compiled, and the accelerating effect of corrosion pits on fatigue crack initiation of the marine riser was analyzed. The results show that a single corrosion pit at the surface can reduce crack nucleation life by more than 80%. In a double corrosion pits' case, the stress interference between pits significantly affects the crack nucleation. Circumferential double pits can produce a fatigue crack earlier than the single pit, but the effect of axial double pits is just the opposite. When the spacing reaches a certain distance, the stress interference disappears, and the crack nucleation life approaches that of a single pit case. Highlights: A special frequency‐dependent high‐cycle fatigue damage model was established.Frequency‐dependent damage parameters were determined from fatigue tests of X80 steel.The acceleration effect of corrosion pits on fatigue crack nucleation was evaluated.
- Subjects
CORROSION fatigue; FATIGUE cracks; DAMAGE models; RISER pipe; CONTINUUM damage mechanics; PITTING corrosion; CRACK initiation (Fracture mechanics)
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2023, Vol 46, Issue 4, p1488
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.13943