Reduction in ultimate strength capacity of corroded ships involved in collision accidents

ABSTRACT The objective of the study 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 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.

[1]  Jonas W. Ringsberg,et al.  Performance assessment of the crashworthiness of corroded ship hulls , 2017 .

[2]  Peggy Wang.  Tensile Strength , 2020, positions: asia critique.

[3]  S Nishihara,et al.  ULTIMATE LONGITUDINAL STRENGTH OF MIDSHIP CROSS-SECTION , 1984 .

[4]  KAIJI KYOKAI.  RULES FOR THE SURVEY AND CONSTRUCTION OF STEEL SHIPS Part CSR-B&T Common Structural Rules for Bulk Carriers and Oil Tankers , 2015 .

[5]  Jonas W. Ringsberg,et al.  Assessment of the crashworthiness of a selection of innovative ship structures , 2013 .

[6]  Jeom Kee Paik,et al.  Methods for ultimate limit state assessment of ships and ship-shaped offshore structures: Part II stiffened panels , 2008 .

[7]  Jae-Myung Lee,et al.  Time-variant ultimate longitudinal strength of corroded bulk carriers , 2003 .

[8]  Kazuhiro Iijima,et al.  Residual Hull Girder Strength of Asymmetrically Damaged Ships : Influence of Rotation of Neutral Axis due to Damages , 2012 .

[9]  Yasuhira Yamada,et al.  Numerical Study on the Residual Ultimate Strength of Hull Girder of a Bulk Carrier After Ship-Ship Collision , 2014 .

[10]  Jeom Kee Paik,et al.  Rapid hull collapse strength calculations of double hull oil tankers after collisions , 2017 .

[11]  Odd Sture Hopperstad,et al.  A damage-based failure model for coarsely meshed shell structures , 2015 .

[12]  Jørgen Amdahl,et al.  On the accuracy of fracture estimation in collision analysis of ship and offshore structures , 2015 .

[13]  Manolis Samuelides,et al.  Recent advances and future trends in structural crashworthiness of ship structures subjected to impact loads , 2015 .

[14]  Joonmo Choung,et al.  A new procedure for load-shortening and -elongation data for progressive collapse method , 2017 .

[15]  Jeom Kee Paik,et al.  Condition assessment of aged structures , 2008 .

[16]  M. Samuelides,et al.  Towards a unified methodology for the simulation of rupture in collision and grounding of ships , 2015 .

[17]  Jonas W. Ringsberg,et al.  An experimental and numerical study of the effects of length scale and strain state on the necking and fracture behaviours in sheet metals , 2009 .

[18]  Sören Ehlers,et al.  The influence of the material relation on the accuracy of collision simulations , 2010 .

[19]  Preben Terndrup Pedersen,et al.  A method for ship collision damage and energy absorption analysis and its validation , 2017 .

[20]  C. Soares,et al.  Tensile strength assessment of corroded small scale specimens , 2014 .

[21]  Erling Østby,et al.  Increased crashworthiness due to arctic conditions – The influence of sub-zero temperature , 2012 .

[22]  Jonas W. Ringsberg,et al.  A method for assessment of the survival time of a ship damaged by collision , 2011 .

[23]  V. Piscopo,et al.  Statistical properties of bulk carrier residual strength , 2015 .

[24]  C. Guedes Soares,et al.  Experimental assessment of the ultimate strength of a box girder subjected to severe corrosion , 2011 .

[25]  Ulf B. Karlsson.  Improved collision safety of ships by an intrusion-tolerant inner side shell , 2009 .

[26]  C. Guedes Soares,et al.  Experimental assessment of tensile strength of corroded steel specimens subjected to sandblast and sandpaper cleaning , 2016 .

[27]  A. AbuBakar,et al.  The impact analysis characteristics of a ship's bow during collisions , 2019, Engineering Failure Analysis.

[28]  Seiichiro Nishihara.  15. Ultimate Longitudinal Strength of Mid-Ship Cross Section , 1984 .

[29]  Jonas W. Ringsberg,et al.  An extensive study of a ship's survivability after collision – A parameter study of material characteristics, non-linear FEA and damage stability analyses , 2012 .

[30]  J K Paik,et al.  Ultimate strength performance of Suezmax tanker structures: Pre-CSR versus CSR designs , 2009 .