Corrosion fatigue model development for tailor-made S-N curves for offshore wind turbine foundations. A deterministic approach
conference paper
Design against fatigue is in many cases the governing criterion for dimensioning offshore wind turbine foundations. Corrosion, and in particular local deep and relatively sharp corrosion pits, affects the fatigue life of the steel components. Corrosion mitigation methods are typically evaluated in the design to reduce the effect of corrosion. Localised corrosion and specifically the effect of pit growth on the fatigue life is typically not included in structural design standards. This paper presents a deterministic corrosion fatigue model and life prediction method that includes fatigue crack initiation in a corrosion pit and the crack propagation life. With the corrosion fatigue model, S-N curves are derived for the relevant input parameters of various conditions and scenarios, which is a simplified representation of the outcome, but enables comparing these to the S-N curves adopted by the DNV RP-C203, typically used in design. This comparison shows that the DNV-RP-C203 S-N curves are conservative for a number of cycles ≥ 10 7 , although this strongly depends on the input parameters used in the developed corrosion fatigue mode.
TNO Identifier
997287
Source title
The 15th Nordic Steel Construction Conference, June 26–28, 2024, Luleå, Sweden
Pages
1-11
Files
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