Accession Number:

AD0636684

Title:

THIRD TECHNICAL PROGRESS REPORT OF THE SHIP STRUCTURE COMMITTEE; RESEARCH UNDER THE SHIP STRUCTURE COMMITTEE.

Descriptive Note:

Welding Research Council Bulletin Series no. 16.

Corporate Author:

AMERICAN WELDING SOCIETY NEW YORK

Report Date:

1953-11-01

Pagination or Media Count:

70.0

Abstract:

Riveted crack barriers are effective in limiting the propagation of cleavage fractures, but ships with 4 or even 8 such arresters have broken in two. The arresting of a crack is primarily the responsibility of the material the prevention of crack initiation, on the other hand, depends on the combination of geometry, fabrication and material. Means for increasing notch toughness of steel beyond present requirements are known and can be initiated now if needed. Lowering the average transition temperature of steels may be a more effective way of obtaining generally improved service performance through increased notch toughness. Continuity of structure to provide easy stress flow and the lightest scantlings for the purpose are more important in the design of welded structures than in riveted structures. The nominal breaking stress of full-scale structural components and of the ships themselves can be considerably less than the nominal strength of the material as determined by ordinary tensile tests. As far as possible, welded joints at points of stress concentration should be avoided. Extended development and use of nondestructive subsurface methods of inspection are indicated.

Subject Categories:

  • Metallurgy and Metallography
  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE