FRACTURE BEHAVIOR CHARACTERIZATION OF SHIP STEELS AND WELDMENTS

In order to enlarge upon current understanding of the behavior of ship steels and weldments, a series of mechanical tests were performed on seven grades of ship steel. These steels were ABS-B, CS, AH-32, EH-32, ASTM A517-D, A678-C, and A537-B and covered the range of ordinary as-rolled, to high strength quenched and tempered alloys. In addition, all materials but the EH-32 were utilized to produce welded plates. These weldments, either manual shielded metal arc or submerged arc procedure, were then machined into test specimens. The test program was designed to probe a large number of specimen and material parameters. The mechanical tests performed were the static tension test, the Charpy impact test, weld side bend test, dynamic tear test, and the drop weight-nil ductility temperature test. Two structural tests were designed to exercise the crack initiation and arrest capability of the steels. One of these tests was the standard explosion crack starter test while the other was a variation of the explosion tear test. The results indicated the general superiority of the fracture performance of the high strength, quenched and tempered alloys over the ordinary ship steels. The structural tests demonstrated the superiority of the manual metal arc welding procedure. This result was generally confirmed by the results of the dynamic tear tests. The data were compared to the proposed fracture criterion proposed by Rolfe, et. al., as presented in SSC-244. Only one material, EH-32, passed all tests prescribed by the proposed criterion.

  • Corporate Authors:

    Southwest Research Institute

    6220 Culebra Road, P.O. Drawer 28510
    San Antonio, TX  USA  78228-0510
  • Authors:
    • Francis, P H
    • Cook, T S
    • NAGY, A
  • Publication Date: 1978-5

Media Info

  • Pagination: 96 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00179707
  • Record Type: Publication
  • Source Agency: Ship Structure Committee
  • Report/Paper Numbers: SSC-276 Final Rpt.
  • Contract Numbers: N00024-75-C-4058
  • Files: TRIS
  • Created Date: Sep 14 1978 12:00AM