The objective of this work is to assess the uncertainties introduced by different approaches for fatigue damage of ship structural details including discrete, closed-form and spectral approaches. The fatigue life is predicted by S-N approach based on the long-term notch stress range. The influence of ship main characteristics, operational profile based on a mission or loading condition, wave climatic data including the use of different scatter diagrams, wave spectra, heading distributions and consider the random origin of the mean stress effect, imperfection, weld shape improvement, hot spot calculation and resulting notch stress concentration factors to the fatigue life of a but welded ship structural component are accounted for.

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