A simple probabilistic model for corrosion evaluation of a ship's hull

A probabilistic model for the evaluation of the corrosion degradation of ship hull members is presented. Emphasis is put to obtain a simple relationship between corrosion depth and service time based on the actual data collected from plate thickness measurements. The corrosion phenomenon is assumed to be the result of two sequential processes: generation of pitting points and progress behaviour of pitting points after their generation. Both processes are treated by the probabilistic method. The proposed model is applied to the collected data of plate thickness measurements of Caraka Jaya ships, and the corrosion behaviour of the ship hull members is evaluated. In the second part of the paper, the effect of corrosion on the longitudinal strength degradation of Caraka Jaya ships is discussed.