SEFACO SYSTEM FOR THE STUDY OF HULL FATIGUE

In parallel with theoretical studies carried out at Bureau Veritas, a practical system for studying hull fatigue has been developed. This experimental shipboard system provides for continuous monitoring of several levels of constraint for use in establishing a correlation between hull fatigue, the meteorological environment of the ship (wind, sea state) and the navigational conditions subject to the human factor, e.g. speed, heading. SEFACO permits real-time visualisation of four essential parameters, i.e.--the constraints in the most highly stressed areas of the hull (sides, sheer strakes, bilges and stringers).--damage suffered by the structure as a function of predetermined safety criteria.--the response of the ship to waves.--actual sea state. The overall constraints measured on the bridge are filtered to obtain the static, quasi-static and dynamic components. For each zone considered, the cumulative fatigue potential is calculated by Miner's rule. A modified Wohler curve has been derived to predict the endurance of the welded structure and a Goodman-Smith diagram is employed for calculating the effects of loading on admissible constraints. The main part of the paper is given to a description of the SEFACO systems installed aboard the 550,000-dwt tankers Bellamya and Batillus and to a discussion of the data processing techniques employed. Order from BSRA as No. 49,568.

  • Supplemental Notes:
    • Nouveautes Techniques Maritimes 1977.
  • Corporate Authors:

    Journal de la Marine Marchande

    190 Boulevard Haussmann
    75008 Paris,   France 
  • Authors:
    • Osouf, J
    • Tesseron, P
    • Bourree, J-M
  • Publication Date: 1977

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00195360
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jul 31 1979 12:00AM