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Fatigue Strength of Tubular Joints

  • K. G. Babu
  • M. Nasser
Conference paper

Abstract

Parametric equations developed earlier for stress concentration factors (SCF) and strain concentration factors (SNCF) for tubular joints are mainly dependent upon the increase in stress and strain due to geo-metric, notch and weld effects. Fatigue failure criteria were also formulated from the above. However, previous loading history to levels beyond working loads due to abnormal environmental forces will result in permanent stresses which will have a large bearing on the design of the structure both for static and fatigue loadings. The paper presents some relevant information from the authors’ tests to bring out the importance of permanent stresses and their relation to the fatigue strength of tubular joints. The influence of a defect (preformed) on the performance of a tubular joint has also been discussed.

Keywords

Residual Stress Fatigue Strength Residual Strain Stress Concentration Factor Notch Stress 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    American Petroleum Institute, ‘Planning, Designing and Constructing Fixed Offshore Platforms’, API RP-2A, Ed.11, January 1980.Google Scholar
  2. 2.
    De Back J., ‘Testing of tubular joints’ Repporterteur’s notes, European Offshore Steels Research Seminar, Cambridge, November, 1978.Google Scholar
  3. 3.
    Dragos Radenkovic, ‘Stress analysis in tubular joints’, Steel in marine structures (int. Conference), Paris, Oct. 1981.Google Scholar
  4. 4.
    Gibstein, M.B., ‘Fatigue failure of T-joints: The Det Norske Veritas fatigue testing programme’, European Offshore Steel Research Seminar, Cambridge, Nov. 1978.Google Scholar
  5. 5.
    Mc Donald, A., Thomson, J.F., ‘The Fatigue strength of large scale welded T-joints’, European Offshore Steels Research Seminar, Cambridge, Nov. 1978.Google Scholar
  6. 6.
    Martin, T., Mc Gregor, J., ‘An integration into the stress distribution and fatigue strength of welded tubular joints’, Ocean Technology Conference, OTC 2856 Houston, Texas, 1977.Google Scholar

Copyright information

© Springer-Verlag Tokyo 1985

Authors and Affiliations

  • K. G. Babu
    • 1
  • M. Nasser
    • 1
  1. 1.Ocean Engineering CentreIndian Institute of TechnologyMadrasIndia

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