Publications

Yeter, B., Garbatov, Y. and Guedes Soares, C. (2015), “Low cycle fatigue assessment of offshore wind turbine monopile supporting structure subjected to wave-induced loads”, Guedes Soares, C. Dejhalla R. and Pavletiæ D., (Eds.), Towards Green Marine Technology and Transport, Taylor & Francis Group, London, UK, 2015, pp. 287-294

The objective of this work is to analyse wind turbine monopile supporting structures subjected to low-cycle fatigue, as a result of abnormal wave loads. The structural assessment of the wind turbine supporting structure accounts for the interaction between various loads and response effects. The primary concern related to the possibility that structural components are subjected to high level of cyclic stresses compared to the yield point of the material is in respect to ageing structures or when the stress concentration factor exceeds a high level or both. The aging of structures involves an interaction between corrosion, fatigue and plastic deformations. Damage accumulation is much higher and occurs at a faster rate if the structural components are subjected to high level of cycle fatigue load. The presence of abnormal waves in the open ocean lead to low cycle fatigue, which is characterized by a high level of amplitude and low frequency plastic strains. Thus, an interaction between low cycle fatigue damage and remaining strength is considered for identifying the safety of offshore wind turbine supporting structures.

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