(a) (b)
(c) Fig. 9 (a) Maximum stress and strain values for the respective load cases obtained from the FE model, (b) for each load case, the number of fatigue cycles sustained by the OWT in the 20 years of operation (ni) is shown by the marker points and the number of cycles that the structural material (S355) can withstand before fatigue failure occurs (Ni) is shown by the dotted line, (c) fatigue damage caused by individual load cases and the cumulative fatigue damage according to Minor’s method. (c) Fig. 9 (a) Maximum stress and strain values for the respective load cases obtained from the FE model, (b) for each load case, the number of fatigue cycles sustained by the OWT in the 20 years of operation (ni) is shown by the marker points and the number of cycles that the structural material (S355) can withstand before fatigue failure occurs (Ni) is shown by the dotted line, (c) fatigue damage caused by individual load cases and the cumulative fatigue damage according to Minor’s method.