Reduction in ultimate strength capacity of corroded ships involved in collision accidents
Journal article, 2018

Many studies in the literature 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 is to investigate the effects of sudden damage, and progressive deterioration due to corrosion, on the ultimate strength of a ship which has been collided by another vessel. Explicit finite element analyses (FEA) of collision scenarios are presented where 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 ships 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 ship is calculated using the Smith method and the shape and size of the damage openings from the FEA. 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.


ultimate strength

Smith method

ship-ship collision

parametric study


Jonas Ringsberg

Chalmers, Mechanics and Maritime Sciences (M2), Marine Technology

Zhiyuan Li

Chalmers, Mechanics and Maritime Sciences (M2), Marine Technology

Erland Johnson

RISE Research Institutes of Sweden

Chalmers, Mechanics and Maritime Sciences (M2), Marine Technology

Artjoms Kuznecovs

Chalmers, Mechanics and Maritime Sciences (M2), Marine Technology

Roozbeh Shafieisabet

Ships and Offshore Structures

1744-5302 (ISSN) 1754-212X (eISSN)

Vol. 13 Sup1 155-166

Chalmers Area of Advance Transport – funding 2018

Chalmers, 2018-01-01 -- 2018-12-31.

Driving Forces

Sustainable development

Innovation and entrepreneurship

Subject Categories

Materials Engineering

Applied Mechanics

Vehicle Engineering

Areas of Advance



Materials Science


Basic sciences


C3SE (Chalmers Centre for Computational Science and Engineering)



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