Publications

Guedes Soares, C. and Garbatov, Y. (1999), “Reliability of Corrosion Protected and Maintained Ship Hulls Subjected to Corrosion and Fatigue", Journal of Ship Research, Vol. 43, Issue 2, pp. 65-78

A formulation is presented for the assessment of the reliability of a ship hull with respect to failure of the longitudinal members as result of fatigue and corrosion. The model allows for the existence of multiple cracks and it accounts for the crack growth process. The midship section modulus is described by a stochastic process. A new model is presented for the effect of corrosion, which is a time dependent process with two stages. In the first one, there is no corrosion due to existence of coating protection. Upon failure of the protection system general corrosion decreases plate thickness and affects the midship section modulus. The inspection is modelled as a random process. One repair policy is considered in the example consisting of plate replacement when its thickness reaches 75% of the original thickness. The time dependent degrading effect of corrosion and crack growth are modelled as a random process also. The reliability is predicted by a time variant formulation and the effects of maintenance actions in increasing the reliability are shown. The sensitivity of the reliability estimates with respect to several parameters is also studied. The formulation has been applied to a tanker.

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