Reduction in ultimate strength capacity of corroded ships involved in collision accidents
Paper in proceedings, 2017
There are many studies in the literature which present advanced numerical simulations of the assessment of the crashworthiness of marine structures. Most of these studies have not considered the effect of corrosion as an impairment of the struck structure’s resistance to the collision load and the consequence on the ship’s ultimate strength. The objective of the current investigation is to study the effects of sudden damage (ship-ship collision), and progressive deterioration due to corrosion, on the ultimate strength of a ship which has been collided by another vessel. Explicit finite element analyses of collision scenarios are presented where several factors are varied systematically in a parametric study, e.g. the vessels involved in the collision, and consideration of corroded ship structure elements and their material characteristics in the model. The striking ship is represented by a coastal tanker while the struck ship is either a RoPax ship, or, a coastal oil tanker vessel. The crashworthiness of the struck vessels 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 for the different collision simulations. The ultimate strength of the struck vessel, for each collision simulation, is calculated using the Smith method and the shape and size of the damage openings from the finite element analyses. In conclusion, the study contributes to understanding of how corroded, collision-damaged ship structures suffer significantly from a reduction in crashworthiness and ultimate strength, how this should be considered and modelled using the finite element method and analysed further using the Smith method.