EFFECT OF SPECIMEN THICKNESS ON FATIGUE CRACK-GROWTH RATE IN 5NI-CR-MO-V STEEL-COMPARISON OF HEAT-TREATED AND STRESS- RELIEVED SPECIMENS

Ship structural design now incorporates the weight-saving advantage of high-strength alloys by reducing the thickness requirements of load-bearing members. For fail-safe applications of thin-section material (less than 0.50 in. (12.5MM) thick) in high-performance ship structures, quantitative information concerning the fatigue crack-growth rate (FCGR) in both ambient air and the marine environment is highly important. The paucity and diverse conclusions of presently available information concerning the effect of material thickness on FCGR provides little engineering guidance for the design of thin-section naval structures. This study of FCGR on a 5Ni-Cr-Mo-V steel tested in three thicknesses indicates that internal residual stresses may have a retardation effect on FCGR in this material. When tested after stress relief, although crack growth is accelerated, it is essentially the same for all thicknesses. /Author/

  • Corporate Authors:

    Naval Research Laboratory

    4555 Overlook Avenue, SW
    Washington, DC  United States  20375-5320
  • Authors:
    • Sullivan, A M
    • Crooker, T W
  • Publication Date: 1975-12-9

Media Info

  • Pagination: 17 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00131514
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: NRL-u936, Phase 1 Final Rpt.
  • Files: TRIS
  • Created Date: May 14 1976 12:00AM