FRACTURE TOUGHNESS CHARACTERIZATION OF SHIPBUILDING STEELS

New fracture control guidelines for welded ship hulls have been proposed as a result of an investigation sponsored by the Ship Structure Committee. These guidelines include fracture toughness requirements in terms of the Drop Weight-NDT temperature and Dynamic Tear (DT) energy. To aid the implementation of these criteria an exploratory program was undertaken to characterize the dynamic fracture toughness of ordinary-strength shipbuilding steels, namely, ABS Grades A,B,C,D,E, and CS. Test materials (plate) were obtained at random from several shipyards and steel mills in an effort to characterize the products of current steel making practice. Fracture toughness trends were defined by means of Drop Weight-NDT, 1-in. DT and standard Charpy V-notch tests and the observed toughness characteristics were compared with the proposed toughness criteria. Non-heat treated plates of ABS Grades A,B, and C were found to have insufficient toughness to meet reasonable fracture toughness requirements. On the other hand, normalized plates ofABS Grades C,D,E, andCS were found to exhibit improved toughness trends that could meet the proposed requirements in most cases.

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  • Corporate Authors:

    Naval Research Laboratory

    Washington D.C. 20024
    ,   United States 
  • Authors:
    • Hawthorne, J R
    • Loss, F J
  • Publication Date: 1974-7

Media Info

  • Features: References;
  • Pagination: 36 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00095186
  • Record Type: Publication
  • Source Agency: Ship Structure Committee
  • ISBN: 63 M01-25
  • Report/Paper Numbers: SSC-248 Final Rpt
  • Files: TRIS
  • Created Date: May 29 1975 12:00AM