Paik, Jeom-Kee; (2023) Effect of time-variant corrosion damage on serviceability and ultimate limit states of a monopile type offshore wind turbine under combined wind and blade rotation. In: Proceedings of the International Conference on Ships and Offshore Structures 2023. ICSOS: Yantai, China.

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Abstract

Ensuring the long-term safe and reliable serviceability of offshore wind farms hold significant benefits for renewable energy production. This study quantifies the impact of corrosion damage on the serviceability and ultimate limit states of a monopile-type offshore wind turbine under combined wind and blade rotation. An empirical formula for time-variant corrosion damage, based on a statistical analysis of a decade-spanning corrosion loss database, is developed and applied to predict the corrosion damage (depth) of a 5MW monopile-type offshore wind turbine as an illustrative example. Using LS-DYNA software, a nonlinear finite element analysis (NLFEA) is carried out on the corroded support structure under combined wind-induced loads and rotor-induced thrust forces. The study also discusses the implications of time-variant estimations towards potentially extending the service life of offshore monopile wind turbines.

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