INVESTIGATION OF FRACTURED STEEL PLATES REMOVED FROM WELDED SHIPS.
Progress summary rept. Jun 42-May 48.
NATIONAL BUREAU OF STANDARDS WASHINGTON D C
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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
- Metallurgy and Metallography
- Marine Engineering