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- Title
Underload-induced crack growth behaviour of minor cycles of pipeline steel in near-neutral pH environment.
- Authors
Yu, M.; Chen, W.; Kania, R.; Van Boven, G.; Been, J.
- Abstract
Despite decades of research, the mechanisms of near-neutral pH stress corrosion cracking of pipeline steel are still not fully understood. This investigation was aimed to understand the effect of minor cycles with very high R ratios (minimum stress/maximum stress) on crack growth in air and in near-neutral pH environments. It has been demonstrated that the minor cycle, even with an R ratio as high as 0.9, could significantly contribute to the crack growth of pipeline steels in the presence of a large underload cycle with a low R ratio of 0.5 in near-neutral pH environment. Comparing with constant amplitude tests, an increase of crack growth rate by a factor of 3 and 5 was observed when some non-propagating minor cycles were combined with an underload cycle for tests in air and in near-neutral pH solution, respectively. Based on the test results, the crack growth mechanisms during minor cycle loading in near-neutral pH environments were discussed and practical strategies aimed to minimise crack growth during pipeline operation were also proposed.
- Subjects
PIPELINES; STEEL; ECOLOGY; MECHANICAL movements; CORROSION &; anti-corrosives
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2015, Vol 38, Issue 6, p681
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.12274