Accession Number:

AD0636749

Title:

FATIGUE TESTS OF SHIP WELDS.

Descriptive Note:

Progress rept.

Corporate Author:

CORNELL UNIV ITHACA N Y

Report Date:

1946-12-13

Pagination or Media Count:

114.0

Abstract:

The results of fatigue tests of twenty-eight specimens representing typical ship welding problems are described. Stress range of zero-to-30,000 psi tension was applied to 11 12 in wide plates having a longitudinal weld in the direction of tension and to 17 in plates with central holes whose boundary was flame cut, flame cut and ground, flame cut and machined, and which had welded reinforcing inserts. Variation in number of weld passes in the longitudinal weld from 1 to 3, each side, is not believed to affect the fatigue behavior significantly, but irregularities such as folds or pits in the weld surface are shown to act as stress raisers and to initiate failure. Tests were made on welds whose surfaces were ground smooth and flush with those of the plate. Two specimens of 50 greater width, and two of another steel, showed no difference in fatigue behavior from the balance of specimens of similar nature. The backstep method of laying weld passes is shown to be superior to the continuous technique. The results of tests of eight specimens with central holes emphasizes the fact that discontinuities of form and stiffness require special treatment to provide paths free of stress raisers. Author

Subject Categories:

  • Metallurgy and Metallography
  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE