Reliability of ship hulls subjected to corrosion and maintenance

Abstract The objective of the present study is to analyse the lifetime reliability of ship hull structures subjected to corrosion degradation, including the effects of inspection and repair actions. Different environmental conditions affecting the corrosion deterioration of ship hull are considered. The uncertainties in an inspection are accounted for by a probability of detection model that introduces additional probabilistic events at the different inspection times. Ship loading uncertainties are modelled based on the time ratio spent under each loading condition during the ship's service life. Each time ratio is defined as the probability of encountering its corresponding loading condition. Based on a fast integration technique, an algorithm is developed to assess the structural reliability of ship hulls efficiently. Ship loading is only composed of still water and wave induced vertical bending moments. The ultimate vertical bending moment capacity of the ship hull is considered as a limit state.

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