CAUSES OF CLEAVAGE FRACTURE IN SHIP PLATE: HATCH CORNER DESIGN TESTS

This report deals with the testing of 12 full scale hatch corner specimens. One of these was essentially the same as the hatch corner used in the earliest 'Liberty' type ships, and the same as has been used in the earlier test. Two of the specimens tested were invalid due to laminated plates. The others included the modifications of: continuous longitudinal grider; full penetration welds; U.S.C.G. Code 5 and Code 1 modifications, and the effectiveness of the doubler plate in the Code 5 modification; the British Code 1A modification; extended coaming; diagonal braces at the bottom of the girder joint; a new design similar in configuration to the hatches used on Victory type ships; a new design involving a hot-formed double radius corner plate. The strength and energy absorbing abilities of each were determined. The use of an extended coaming was found to be a very effective and simple modification. The design utilizing the formed corner was far superior to all other and produced definitely ductile behavior, a quality which has not before been found in welded hatch corners. (Author)

• Supplemental Notes:
  • See also AD-636 743.
• Corporate Authors:

  University of California, Berkeley

  Berkeley, CA  United States  94720
• Authors:
  • DeGarmo, E P
  • Boodberg, A
• Publication Date: 1947-12-4

Media Info

• Pagination: 90 p.

Subject/Index Terms

• TRT Terms: Cleavage fracture; Design; Ductility; Energy absorption; Fracture mechanics; Hatch covers; Hulls; Merchant vessels; Shape; Ship structural components; Steel; Steel plates; Tests; Weld tests; Welds
• Identifier Terms: Ship Structure Committee
• Uncontrolled Terms: Configuration; Ship hulls
• Old TRIS Terms: Hatch corners; Hatch stress; Ship hatches; Ship plates
• Subject Areas: Design; Marine Transportation; Materials;

Filing Info

• Accession Number: 00327711
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: SSC- 16 Final Rpt.
• Contract Numbers: NOBS-31222, NOBS-34231
• Files: TRIS
• Created Date: Feb 18 1981 12:00AM