FATIGUE OF STRUCTURAL STEEL FOR OFFSHORE PLATFORMS

Laboratory data for engineering fatigue design was obtained on cyclically strained cantilevered plates of carbon steel in air and flowing sea water. Some information on weld geometry and cathodic protection was gathered. The results were expressed as a "fatigue-life" prediction in terms of the total cyclic strain range (delta epsilon sub t) and the number of cycles N to grow a surface crack (1 sub 8) eight inches long. An alternate analysis in terms of fatigue crack growth rate (d1/dN) was developed for a portion of the results. Most data were collected in the low-to-medium cycle life regions (10 to the 3rd power - 10 to the 5th power cycles), but two specimens were tested where extended lives (10 to the 9th power cycles) and low strains (delta epsilon=200 mu inches/inch) prevailed. Precautions in corrosion fatigue tests of mild steel in sea water are highlighted.

Media Info

  • Features: References;
  • Pagination: p. 831-844

Subject/Index Terms

Filing Info

  • Accession Number: 00138231
  • Record Type: Publication
  • Source Agency: Offshore Technology Conference
  • Report/Paper Numbers: V2, OTC 2604 Proceeding
  • Files: TRIS
  • Created Date: Aug 23 1976 12:00AM