REDISTRIBUTION OF INITIAL RESIDUAL STRESSES IN SHIP STRUCTURAL DETAILS AND ITS EFFECT ON FATIGUE

Ship structural details are designed to sustain fatigue loading by an implicit method where long term experience has selected successful design. This study shows that residual stresses are frequently redistributed in cut-outs and openings of tanker webframes and that the resulting residual stress conditions are predictable. Different assumptions of the initial residual stress field are made and redistribution due to sea loads is studies with on-linear finite element analysis. Examples chosen for the investigation are flame cut edges in a conventional tanker webframe. It is shown that during each voyage local yielding will occur at the most fatigue-sensitive notches in the studied webframe. High stress ranges will cause considerable redistribution of the initial residual stress field. Locations with high tensile as well as compressive mean stresses can be detected. For cut-outs, geometrical optimisation by variation of the curvature is made possible. A reduction of damage is demonstrated for a specific notch in the studied webframe by a Palmgren-Miner damage calculation. A comparison of different approaches to calculate the damage has also been made showing significant differences.

  • Supplemental Notes:
    • Marine Structures, v 8 n 4, 1995, p 385 [22 p, 15 ref, 5 tab, 12 fig]
  • Authors:
    • Eckerlid, J
    • Ulfvarson, A
  • Publication Date: 1995

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00711006
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM