THE CRUSHING MECHANICS OF BOW STRUCTURE IN HEAD ON COLLISION (1ST REPORT); THE DERIVATION OF SIMPLIFIED EQUATIONS AND THEIR VERIFICATION

The Yang & Caldwell technique of deriving simplified equation of mean collapse force based on Wierzbicki's collapse mechanism is improved and applied to ship bow structures. The ship bow structure is divided into simple elements of L shape, T shape and + shape. The absorbed plastic energy in crushing of these elements is derived. The method is extended to the case in which plates of several different thickness exist. The collapse modes are chosen so that the collapse force becomes minimum, while maintaining the consistency between elements. The absorbed energy of each element is summed up to be the total absorbed energy in the crushing of the bow structure. The number of waves between frames is determined to make the collapse force minimum. The crushing force is computed as the absorbed energy divided by the crushing length. Also, extensions are made to the non-prismatic structures. Finite element analysis using MSC/DYSTRAN is applied to verify the validity of this approach. Comparisons are made with experiments by Nagasawa et al. Good agreements of this simplified equation with numerical analysis and experiments are observed.

  • Supplemental Notes:
    • J Soc Naval Arch Japan, v 176, Dec 1994, p 301 [8 p, 6 ref, 19 fig]
  • Authors:
    • Ohtsubo, H
    • Suzuki, K
  • Publication Date: 1994

Language

  • Japanese

Subject/Index Terms

Filing Info

  • Accession Number: 00710731
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM