The paper describes an investigation of the toughness properties of 9%Ni steel at loading rates occurring in ship structures. Dynamic properties have been lacking, and it has been the aim of this investigation to compare the dynamic and static fracture toughness for a large number of production heats. The investigation demonstrated that the fracture toughness at - 196 degree C of 9%Ni steel is not impaired by high strain rates. This is of importance when this steel is used in shipbuilding in tanks for the transportation of LNG, as dynamic stresses may occur in the tank system because of wave-induced loads through the interaction between the hull and the tank and the cargo sloshing about in partially filled tanks. In the construction of independent LNG ship tanks to the 'leak-before-failure' principle, it is a requirement that the critical crack sizes should be evaluated for realistic loading rates.

Media Info

  • Features: Appendices;
  • Pagination: p. 195-205

Subject/Index Terms

Filing Info

  • Accession Number: 00165407
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: Paper 12 Conf Proc
  • Files: TRIS
  • Created Date: Nov 23 1977 12:00AM