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Local stress analysis of welded ship structural details under consideration of the real weld profile
Publikationstyp
Conference Paper
Date Issued
2007
Sprache
English
Author(s)
Fricke, Wolfgang
Volume
2
Start Page
1071
End Page
1079
Citation
10th International Symposium on Practical Design of Ships and other Floating Structures, PRADS 2007. - Vol. 2. - Seite 1071-1079
Contribution to Conference
Scopus ID
Publisher
ABS
ISBN
0-943870-05-4
978-0-943870-05-2
The fatigue strength of welded ship structural details can be assessed by local stress approaches. In contrast to the widely applied nominal and structural hot-spot stress approaches, the notch stress approach can explicitly consider the shape of the weld. Usually a quite simplified weld profile is assumed, but it is also possible to reproduce the real weld profile, if data is available. In the paper, the notch stress approach is described and techniques are introduced for measuring the weld profile, focusing especially on the laser-based sheet-oflight measurement system. Taking different bracket connections as an example, which have been analyzed in a recent research project, the derivation of a realistic weld profile from the laser measurement is described, introducing a fictitious notch radius to account for micro-support effects of the material. The so-called effective notch stress is then analyzed using finiteelement submodels of the coarse bracket models. The fatigue test results are compared with design S-N curves based on the computed effective notch stresses as well as with the structural hot-spot stresses derived from the coarse models. Finally, conclusions are drawn with regard to the practical application in ship structural design.
Subjects
Bracket
Fatigue
Local stress
Ship structural detail
Structural hot-spot stress
Welded joint
Weld profile
DDC Class
620: Engineering