FATIGUE DAMAGE CALCULATION FOR OIL TANKER AND CONTAINER SHIP STRUCTURES

The fatigue behaviour of longitudinal stiffeners of oil tankers and container ships, subjected to dynamic loads, is analyzed. The following dynamic load components are considered: hull girder vertical wave bending moment, alone and combined with the horizontal wave bending moment, hydrodynamic pressure and inertial forces caused by cargo acceleration. The spectral method was selected to calculate the fatigue damage, based on S-N curves and Miner's rule. Following this approach, the fatigue damage may be calculated as a function of a stress parameter OMEGA p, which represents the cumulative effect of wave induced loads in the unit of time and incorporates the combined effects of stress level and its occurring frequency. Simple formulas for OMEGA p, which represents the cumulative effect of wave induced loads in the unit of time and incorporates the combined effects of stress level and its occurring frequency. Simple formulas for OMEGA p of oil tankers and container ships are given, obtained from the results of hydrodynamic analyses performed on several ships, in different wave environments. Several examples show the applicability of the methods to real ship structures. The method, however, still needs to be calibrated because of the simplifying hypotheses introduced in the loading conditions.

  • Supplemental Notes:
    • Marine Structures, v 7 n 6, 1994, p 499 [37 p, 15 ref, 14 tab, 19 fig]
  • Authors:
    • Xue, J
    • Pittaluga, A
    • Cervetto, D
  • Publication Date: 1994

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00716279
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Feb 28 1996 12:00AM