Performance assessment of the crashworthiness of corroded ship hulls

Paper in proceeding, 2017

The effects of ship-ship collision damage and progressive deterioration due to corrosion of a struck ship’s hull are studied numerically in a crashworthiness assessment. The performance of a struck ship’s hull is quantified in terms of the shape and size of the damage opening in the side-shell structure, and the division of energy absorption between the striking and struck ships. Results from finite element analyses are presented where several factors are varied in a parametric study: ship speed, collision angle, bow stiffness, material strain rate effect, friction characteristics of the outer side-shell of the struck ship, and influence from corrosion. The results show that the combined effects of a sudden collision load and corrosion lead to a damage opening size of the struck ship which is around 25% larger compared to the reference case with full corrosion margin and with non-corroded friction characteristics of the ballast water tank surface areas.