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Fatigue strength of laser-stake welded T-joints subjected to combined axial and shear loads

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Abstract

Laser-stake welding enables an economic production of all-steel sandwich panels that can be used for steel bridges as well as for decks in roll-on/roll-off ships (ferries). Deck plates of 10 mm thickness can be joined with interior web plates ensuring a weld throat thickness of 2–3 mm. In a research project, fatigue tests were performed with laser-stake welds subjected to axial, shear and multiaxial in-phase loading and assessed by the nominal and the notch stress approach. In addition to possible effects of gaps between deck and web plates or of the steel strength, the application of interaction formulae to laser-stake welds is checked as contained in Eurocode 3 and the IIW recommendations for the fatigue assessment of multiaxial loading. Furthermore, the equivalent von Mises stress is applied using the notch stress approach. In this way, the basis is provided for a safe design of laser-stake-welded T-joints.

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Acknowledgments

The investigations were performed within the project 16935 BG “Laser-welded T-Joints” of the Research Association for Steel Application (FOSTA) which was funded with public means within the programme “Industrial Cooperative Research” (IGF) by the German Federal Ministry of Economics and Technology via the FOSTA and the Center of Maritime Technologies (CMT). The research partners are grateful for the financial support and thank also the committee of industrial partners for their valuable comments and guidance.

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Authors and Affiliations

  1. Institute for Ship Structural Design and Analysis, Hamburg University of Technology (TUHH), Hamburg, Germany

    W. Fricke & C. Robert

  2. SLV Mecklenburg-Vorpommern GmbH, Rostock, Germany

    R. Peters & A. Sumpf

Authors
  1. W. Fricke
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  2. C. Robert
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  3. R. Peters
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  4. A. Sumpf
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Corresponding author

Correspondence to W. Fricke.

Additional information

Recommended for publication by Commission XIII - Fatigue of Welded Components and Structures

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Fricke, W., Robert, C., Peters, R. et al. Fatigue strength of laser-stake welded T-joints subjected to combined axial and shear loads. Weld World 60, 593–604 (2016). https://doi.org/10.1007/s40194-016-0322-z

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  • DOI: https://doi.org/10.1007/s40194-016-0322-z

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