Over the last few years there has been an increase in cases of rudder damage, particularly of the back piece. According to statistics, the damage most frequently occurs on semi-suspended rudders (with one or two pintles), sometimes on suspended rudders, and far more rarely on twin-pintle rudders with a flanged rudder post. A morphological analysis shows that fractures of the back piece are due to fatigue caused by cyclic flexural vibrations, with the fractures starting in those areas where stress concentrations are greatest. Propagation of the crack then continues along one edge towards the escape point, a fine-grain smooth zone where the damage is not often obvious. Finally, the part tears away at the opposite edge of the back piece, the crystalline zone, and the lower part breaks away from the upper. The Author reviews fractures encountered and the vibration stresses to which different types of rudder are subjected. Test results are also described. The dynamic behavior of the rudder under propeller-induced vibrations is discussed at some length. Order from: BSRA as No. 48,976.

  • Supplemental Notes:
    • This is a reprint of a report presented to the Association Technique Maritimes et Aeronautique on April 26, 1976. (Presented in the September and October issue of the Bulletin Technique du Bureau Veritas.)
  • Corporate Authors:

    Bureau Veritas

    One Western Union International Plaza
    New York, NY  United States  10004
  • Authors:
    • Osouf, J
  • Publication Date: 1976-9


  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00182483
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Sep 27 1978 12:00AM