Accession Number : AD0636304

Title :   INVESTIGATION OF FRACTURED STEEL PLATES REMOVED FROM WELDED SHIPS.

Descriptive Note : Progress summary rept. Jun 42-May 48.

Corporate Author : NATIONAL BUREAU OF STANDARDS WASHINGTON D C

Personal Author(s) : Williams, Morgan L. ; Ellinger,George A.

Report Date : 25 FEB 1949

Pagination or Media Count : 78

Abstract : This report covers the examination of fractured plates selected from 60 ships in which structural failures occurred. The chemical compositions and ordinary mechanical properties of most of the plates were satisfactory and met the specification requirements under which they were purchased. However, Charpy notched bar tests indicated that the plates in which fractures originated were notch sensitive at the temperature of fracture, and plates in which the fractures ended were generally less notch sensitive. Most of the fractures occurred at low operating temperatures, and the origin of each of the fractures examined could be traced to a notch such as a hatch corner, ladder opening, or a faulty weld. Such notches and defects create regions of stress concentration which may start failures in steels that are notch sensitive at the operating temperatures. (Author)

Descriptors :   (*SHIP PLATES, FRACTURE(MECHANICS)), (*SHIP HULLS, WELDS), STEEL, STRUCTURAL PROPERTIES, NOTCH SENSITIVITY, SHIP STRUCTURAL COMPONENTS, DEFECTS(MATERIALS), STRESSES, FAILURE(MECHANICS)

Subject Categories : Metallurgy and Metallography
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE