MORPHOLOGICAL ASPECTS OF FATIGUE CRACK GROWTH IN SHIP STRUCTURES

It is important to evaluate the fitness for serviceability of structural members, in which fatigue cracks are found during in- service inspections. Stress analyses of fatigue cracks in ship structures are discussed in the first part of this paper, where crack propagation paths are sometimes prerequisite to the proper understandings of fatigue crack propagation because curved crack paths and sharp crack turning could occur at the intersections of structural members mainly due to stress biaxiality of repeated loads. In order to investigate the fatigue crack growth behaviour of this kind, fatigue crack propagation tests are carried out under various repeated nominal biaxial stress range ratios. Various morphological modes and mode transitions of fatigue failures are observed by experiments in this work. A step-by-step finite element simulation is also used for fatigue crack path prediction of the test specimens. The simulated modes of failure are in fairly good agreement with the experimental results, while discrepancies are sometimes observed for the crack propagation lives.

  • Supplemental Notes:
    • PRADS 95, 6th Intl Symposium on Practical Design of Ships and Mobile Units; 17-22 Sept 1995; Seoul, Korea. Procs. Publ by Soc Naval Architects of Korea, ISBN 89-950016-2-3. Vol 2, p 2.922 [12 p, 10 ref, 1 tab, 11 fig]
  • Authors:
    • Sumi, Y
    • Yang, Chenxuan
  • Publication Date: 1995

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00727828
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Nov 4 1996 12:00AM