期刊
MARINE STRUCTURES
卷 42, 期 -, 页码 115-136出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marstruc.2015.03.005
关键词
Monopile; Offshore wind turbines; Seawater; Fatigue; Crack
资金
- Offshore Wind Structural Lifecycle Industry Collaboration (SLIC) project
- Petroleum Technology Development Fund (PTDF), Nigeria
- Engineering and Physical Sciences Research Council [EP/L014106/1] Funding Source: researchfish
- EPSRC [EP/L014106/1] Funding Source: UKRI
This paper presents experimental assessment of crack growth rates of S355J2+N steel in a corrosion fatigue environment similar to what is experienced on offshore wind farm monopile structures under various cyclic load frequencies in order to assess the effect of cyclic frequency of the applied loading within a frequency range pertinent to the structure. Fatigue crack propagation behaviour in this test programme is evaluated through fatigue tests on six compact tension test specimens in air and in laboratory simulated seawater under free corrosion condition. Fatigue crack lengths were monitored by back face strain (BFS), DCPD and ACPD. A regression model was derived through the BFS method to express strain values as a function of crack length to width ratio. The effectiveness of BFS method is particularly demonstrated in the simulated marine environment. Within the range of test frequencies, crack growth rates in simulated seawater when compared to the equivalent air test revealed environmental reduction factors of 2 and 4 at lower and higher values of stress intensity factors respectively. Significant difference in the results of the seawater test frequencies is discussed. (C) 2015 Elsevier Ltd. All rights reserved.
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