Assessment of the crashworthiness of a selection of innovative ship structures

The purpose of the current study is to assess a selection new innovative crashworthy side-shell structures, with respect to their contribution to the crashworthiness of ships, and compare them to a conventional reference structure. Explicit finite element (FE) simulations are used to assess the performance of each structure on a small-scale experimental structure as well as in simulations of large-scale ship collisions. The structures compared are divided into two concepts: the maximization of striking bow-struck ship contact area by allowing for a large intrusion depth of the bow before the watertight integrity is breached (ductile design), and the maximization of energy absorption of the structure and low intrusion depth of the striking bow (strength design). The assessment is made by comparing the intrusion depth before rupture of the inner side-shell of a double-hull structure occurs, energy absorption during the indentation, the final damage opening area as well as the weight and manufacturing costs of each structure. It was found that the strength design concept – the X-core structure – was in favour of the ductile design concept – the corrugated inner side-shell structure. The results provide basis for discussing the potential and challenges related to the implementation of each structure.

[1]  Jani Romanoff,et al.  Numerical and experimental investigation on the collision resistance of the X-core structure , 2012 .

[2]  Jonas W. Ringsberg,et al.  Survivability analysis of a struck ship with damage opening – influence from model and material properties uncertainties , 2011 .

[3]  Przemysław Kołakowski,et al.  The effect of selected parameters on ship collision results by dynamic FE simulations , 2003 .

[4]  J. B. Caldwell,et al.  Rule-based optimization of midship structures , 1992 .

[5]  V. Rubino,et al.  The three-point bending of Y-frame and corrugated core sandwich beams , 2010 .

[6]  Jonas W. Ringsberg,et al.  What can we learn from uncertainty analysis with respect to survivability or time to capsize of a ship struck in collision , 2011 .

[7]  Mohammad T. Tavakoli.  Assessment of oil spill in ship collision and grounding , 2011 .

[8]  Jonas W. Ringsberg,et al.  Experimental and numerical investigation of bulb impact with a ship side-shell structure , 2009 .

[9]  Bo Cerup Simonsen,et al.  Comparison of the crashworthiness of various bottom and side structures , 2002 .

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

[11]  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 .

[12]  Lloyd's Register-Fairplay,et al.  World casualty statistics , 2008 .

[13]  Jeom Kee Paik,et al.  Collision-accidental limit states performance of double-hull oil tanker structures : pre-CSR versus CSR designs , 2009 .

[14]  A Glykas,et al.  Energy conservation during a tanker collision , 2001 .

[15]  Odd Sture Hopperstad,et al.  On the resistance to penetration of stiffened plates, Part II: Numerical analysis , 2009 .

[16]  Margareta Lützhöft,et al.  “The technology is great when it works” Maritime Technology and Human Integration on the Ship’s Bridge , 2004 .

[17]  P. Terndrup Pedersen.  Review and application of ship collision and grounding analysis procedures , 2010 .

[18]  Joško Parunov.  ISSC 2006 – 16th International Ship and Offshore Structures Congress, 20-25 August 2006, University of Southempton, UK , 2006 .

[19]  Alan Klanac,et al.  Qualitative design assessment of crashworthy structures , 2005 .