PART I: CRACK-STARTER TESTS OF SHIP FRACTURE AND PROJECT STEELS

The performance of rimmed and semikilled steels involved in ship fractures is investigated by means of crack-starter tests. In these tests a sharp crack is introduced in the steel, and the relative resistance to the initiation and propagation of fracture is established over the range of service temperatures. It is demonstrated that in the presence of the sharp crack the steels have no appreciable ductility when the temperature falls below the Charpy V 10ft-lb transition; accordingly, fracture initiation is readily developed. The propagation of brittle fracutres becomes difficult at temperatures above the Charpy V 15--25 ft-lb transitions. These findings are in agreement with National Bureau of Standards data for ship fracture plates. It is demonstrated that fully killed steels do not follow these rules and that the respective initiation and propagation characteristics of fracture are related to higher Charpy V values. Wide plate, tear and Charpy V test data are discussed with reference to differences related to deoxidation practice.

• Corporate Authors:

  Naval Research Laboratory

  4555 Overlook Avenue, SW
  Washington, DC  United States  20375-5320

  Ship Structure Committee

  National Academy of Science, 2101 Constitution Avenue, NW
  Washington, DC  United States  20418
• Authors:
  • Puzak, P P
  • Schuster, M E
  • Pellini, W S
• Publication Date: 1954-6-18

Media Info

• Pagination: 60 p.

Subject/Index Terms

• TRT Terms: Cracking; Fracture mechanics; Plate bearing test
• Identifier Terms: Ship Structure Committee
• Uncontrolled Terms: Crack initiation; Crack propagation
• Old TRIS Terms: Explosion tests
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00331280
• Record Type: Publication
• Source Agency: Ship Structure Committee
• Report/Paper Numbers: SSC- 77 Final Rpt.
• Files: TRIS
• Created Date: May 21 1981 12:00AM