Influence of weld-induced distortions on the stress magnification factor of a thin laser-hybrid welded ship deck panel

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


  • A. Niraula
  • Matti Rautiainen
  • A. Niemelä
  • I. Lillemäe-Avi
  • Heikki Remes

Research units

  • Meyer Turku Shipyard
  • LTH Bass


The limited knowledge about fatigue behavior and lack of analytical solutions for distorted thin plates are predominantly limiting their application today. This paper focuses on finding the most influential distortion parameter that dictates the fatigue strength at the butt weld of a laser-hybrid welded 4 mm thin ship deck panel. A FEA based sensitivity analysis method is employed to identify the influence of the distortion parameters. The results from the experimental validation showed that the distortions of the distorted deck plate on either side of the butt weld could be simplified with 4-point and 3-point splines on longitudinal and transversal direction, respectively. The most important distortion parameters are local angular misalignment, the distortion magnitude and location of local maximum distortion close to the butt weld. The distortion parameters further away from the weld has a minor influence on the structural stress at the butt weld. Furthermore, the results showed that the local angular misalignment can independently provide a better estimate of stress magnification factor km compared to any other distortion parameters.


Original languageEnglish
Title of host publicationTrends in the Analysis and Design of Marine Structures
Subtitle of host publicationProceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019
EditorsC.Guedes Soares, J. Parunov
Publication statusPublished - 8 May 2019
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Marine Structures - Dubrovnik, Croatia
Duration: 6 May 20198 May 2019
Conference number: 7

Publication series

NameTrends in the Analysis and Design of Marine Structures - Proceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019


ConferenceInternational Conference on Marine Structures
Abbreviated titleMARSTRUCT

ID: 35666653