Corrosion fatigue load frequency sensitivity analysis |
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| Affiliation: | 1. Universite Paris Ouest, LEME, 50 rue de Sevres, 92410 Ville d’Avray, France;2. Arts et Metiers ParisTech, I2M, CNRS, Universite de Bordeaux, Esplanade des Arts et Metiers, 33405 Talence Cedex, France;3. Parks College of Engineering, Aviation and Technology, St. Louis University, St. Louis, MO 63103, USA;1. Department of ArGEnCo, University of Liege, Belgium;2. Department of Mechanical Engineering, Vrije Universiteit Brussel, Belgium;3. Department of Civil Engineering, Aalborg University, Denmark;1. Department of Bridge Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China;2. National Engineering Laboratory for Technology of Geological Disaster Prevention in Land Transportation, Southwest Jiaotong University, Chengdu, Sichuan 611756, China;1. Dept. of Civil and Environmental Engineering, University of Florence, Italy;2. Dept. of Civil, Architectural, and Environmental Engineering, The University of Texas at Austin, USA;1. Arts et Metiers ParisTech, I2M Bordeaux, CNRS, 33405 Talence, France;2. Universite Bordeaux, I2M Bordeaux, CNRS, 33405 Talence, France;3. UTC Aerospace Systems, Ratier-Figeac, 46100 Figeac, France;1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China;2. Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China;3. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore |
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| Abstract: | 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. |
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| Keywords: | Monopile Offshore wind turbines Seawater Fatigue Crack |
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