Accession Number : AD0078999

Title :   TENSILE TESTS OF LARGE SPECIMENS REPRESENTING THE INTERSECTION OF A BOTTOM LONGITUDINAL WITH A TRANSVERSE BULKHEAD IN WELDED TANKERS.

Descriptive Note : Final rept.,

Corporate Author : NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD

Personal Author(s) : Irwin, L. K. ; Campbell, W. R.

Report Date : 18 JAN 1954

Pagination or Media Count : 68

Abstract : Investigations of 3 discrete designs of a bottom longitudinal connection at a bulkhead were made to furnish information on their relative mechanical behavior when loaded in tension. The through longitudinal design was experimental; the interrupted longitudinals were of the T-2 tanker design; and the through-bracket logitudinals were of a navy oiler or commercial tanker design. Room-temperature tests, tests to failure near 0 F or other selected temperatures below room temperature, and tests to failure at temperatures above and below 0 F were conducted. The maximum stress ratios for the section adjacent to the transverse bulkhead were 1.2 on the through longitudinal, 2.1 to 2.8 on the interrupted longitudinals, and 1.6 to 1.9 on the through-bracket longitudinals, except for one specimen on which the stress ratio was 2.3. The data roughly indicate the inability of the longitudinals to absorb energy when tested to failure. All specimens failed with cleavage fractures after varying amounts of plastic deformation. The energy to fracture generally increased with temperature. Results of the tests to failure near 0 F indicate that the modifications to the basic T-2 design were beneficial and increased the capacity of the interrupted longitudinals to absorb the energy of deformation. Comparisons of maximum load, over-all elongation, and energy to fracture for the 3 designs indicate the following qualitative order of merit: (1) through longitudinal of experimental design, (2) through-bracket longitudinal of Navy oiler design, and (3) modified interrupted longitudinals for T-2 tankers. (Author)

Descriptors :   *TANKERS, *WELDS, TENSILE PROPERTIES, TESTS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE