FATIGUE CRACK GROWTH BEHAVIOUR UNDER RANDOM LOADING MODEL SIMULATING REAL ENCOUNTERED WAVE CONDITION

The purpose of this study if to clarify a random loading model for fatigue strength analysis of ship structural members, and to examine fatigue crack growth behaviour under the above random loading condition. Data was analyzed which was collected from 38 ships that sailed in the North Pacific and 11 ships in the Japan- Indian Ocean over a period of 14 years; and 6 naval ships in the North Pacific near Japan. The main points are as follows: 1) the distribution function of long-term wave-induced load and stress can be described by the Weibull distribution function, with an expected shape parameter value close to unit; 2) the time history of wave conditions during service sailing can be divided into two types - calm sea condition and various storm conditions. These two kinds of conditions appear in random order; 30 based on the above results, a random loading model - 'storm model' for the fatigue design of a ship is proposed. Then, welded joints simulating side longitudinals of ship structural member were tested under constant and storm loading model. Fatigue crack growth behaviour such as crack growth rate, retardation phenomenon etc. were examined.

  • Supplemental Notes:
    • Marine Structures, v 8 n 4, 1995, p 407 [16 p, 5 ref, 1 tab, 17 fig]
  • Authors:
    • Tomita, Y
    • Matoba, M
    • Kawabe, H
  • Publication Date: 1995

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00710987
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM