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In the construction of offshore platforms one-side welding is often unavoidable and so are root defects. To gain better knowledge of the influence of root defects on the fatigue behaviour, tests have been carried out on butt welded tubular joints under axial loading with a constant amplitude. The connections of tubes with different wall thicknesses (16 and 25 mm), with or without a high/low defect, show the lowest fatigue strength, reducing the fatigue life by least a factor of 4. A considerable reduction of the fatigue life is also found for joints with a lack of root fusion or with a mechanical notch in the root. The effect of cold cracks in the root of the weld is very small and almost negligible. For all types of weldment it appears that both the crack initiation and the crack growth rate depend greatly upon the very local geometry of the weldment, especially the differences in wall thickness, misalignment and the dimensions of the defects.

Additional information

Authors: SCHOLTE H G (EDITOR), Delft University of Technology, Ship Structures Laboratory (NL)
Bibliographic Reference: EUR 13395 EN (1992) Vol. 2, 59 pp., FS, ECU 6.25
Availability: (2)
ISBN: ISBN 92-826-3624-0
Record Number: 199210350 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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