Fatigue strength behaviour of welded threaded studs in load-carrying ship structures

Field of research: Fatigue Strength; Outfitting Design

Duration: 01.12.2009 – 31.01.2012

Project leader: Prof. Dr.-Ing. W. Fricke

Funded by: AiF (via CMT), FKZ 16271

Summary

Stud arc welding has successfully been applied to various cases. In shipbuilding, particularly the fastening of outfitting parts  is in the focus in addition to applications assisting the fabrication. The application shall be extended to pipe fasteners being welded on the bulb of deck beams. As the latter are highly cyclically stressed due to hull girder bending, a sufficient fatigue strength  has to be ensured. In the project, extensive fatigue tests are performed at the bulb flates with welded studs. The effective notch stress approach is applied and verified for the first time for this type of welding so that the results can be transferred to other geometries and load cases.

 

 Publications:

  • Tchuindjang, D.; Fricke, W. (2011): Schwingfestigkeitsverhalten von Bolzenschweißungen in der tragenden Schiffskonstruktion. In: Schweißen im Schiffbau und Ingenieurbau 2011, S. 74-81, DVS-Berichte Band 277, DVS Media, Düsseldorf
  • Tchuindjang, D.; Fricke, W. (2012): Schwingfestigkeitsverhalten von Bolzenschweißungen in der tragenden Schiffskonstruktion. Schiff&Hafen 12/2012, 52-55
  • Fricke, W; Tchuindjang, D. (2012): Fatigue Strength Behaviour of Stud-Arc Welded Joints in Load-Carrying Ship Structures. IIW-Doc.XIII-2417-12, International Institute of Welding.

Final report:

  • Fricke, W; Tchuindjang, D. (2012). Schwingfestigkeitsverhalten von Bolzenschweißungen in der tragenden Schiffskonstruktion. Bericht 19/2012, Center of Maritime Technologie, Hamburg.Persons:

    Dipl.-Ing. Didi D. Tchuindjang