Fatigue strength of thin laser-hybrid welded full-scale deck structure
Source abstract
Abstract
The fatigue behavior of a 4-mm thick laser-hybrid welded structure was studied using small- and full-scale specimens. The aim of the work was to understand the response and fatigue strength of large thin welded structures. The difference and similarity between small- and full-scale specimens, which is crucial in order to transfer fatigue test results into fatigue design, was carefully studied. The experiments included accurate optical geometry measurements and constant amplitude fatigue testing under axial loading. The fatigue test results were analyzed in terms of structural hot spot stress. The results showed that when initial distortion shape and geometrical nonlinearity are properly considered, the small- and full-scale specimens have equal fatigue strength with small scatter and the same S-N curve slope close to m = 5. In addition, the measured fatigue strength is considerably higher in comparison to IIW structural stress design curve FAT100. This indicates that high fatigue strength can be achieved in thin laser-hybrid welded structures, given that the shape and the magnitude of initial distortion as well as the weld quality are controlled.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Welding Techniques and Residual Stresses · Fatigue and fracture mechanics · Advanced Welding Techniques Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (28)
Show source-provided references
1. Influence of initial distortion of 3 mm thin superstructure decks on hull girder response for fatigue assessment10.1016/j.marstruc.2014.04.001 ↗
2. Det Norske Veritas. Fatigue assessment of ship structures, classification notes 30.7; 2014.
3. Hobbacher A. Recommendations for fatigue design of welded joints and components, IIW doc. 1823-07, Welding Research Council Bulletin 520, New York; 2009.
4. Fatigue strength of welded butt joints in thin and slender specimens10.1016/j.ijfatigue.2012.05.009 ↗
5. Fatigue strength of laser-welded thin-plate ship structures based on nominal and structural hot-spot stress approach10.1080/17445302.2013.850208 ↗
6. Fatigue strength of thin-plated block joints with typical shipbuilding imperfections10.1007/BF03321402 ↗
7. Influence of weld quality on the fatigue strength of thin normal and high strength steel butt joints10.1007/s40194-016-0326-8 ↗
8. Fatigue strength analysis of laser-hybrid welds in thin plate considering weld geometry in microscale10.1016/j.ijfatigue.2016.01.019 ↗
9. Microstructure and fatigue performance of butt-welded joints in advanced high-strength steels10.1016/j.msea.2014.01.007 ↗
10. Influencing factors on fatigue strength of welded thin plates based on structural stress assessment10.1007/s40194-014-0170-7 ↗
11. Effect of weld geometric profile on fatigue life of cruciform welds made by laser/GMAW processes10.1016/j.marstruc.2006.07.002 ↗
12. Stein J, Kallage P. Induction assisted welding technologies in steel utilization – INDUCWELD. RFSR-CT-2005-00040, Res Prog Fund for Coal and Steel; 2010.
13. Mecozzi · 2010
14. Statistics of weld geometry for laser-hybrid welded joints and its application within notch stress approach10.1007/BF03263505 ↗
15. S-N lines for welded thin joints – suggested slopes and FAT-values for applying the notch stress concept with various reference radii
16. Influence of initial distortion on the structural stress in 3 mm thick stiffened panels10.1016/j.tws.2013.07.001 ↗
17. Consideration of influence factors between small-scale specimens and large components on the fatigue strength of thin-plated block joints in shipbuilding10.1111/ffe.12058 ↗
18. Lillemäe I, Liinalampi S, Remes H, Avi E, Romanoff J. Influence of welding distortion on the structural stress in thin deck panels. PRADS 2016, 4–8 September 2016, Copenhagen, Denmark.
19. ISO 6507-1:2005. Metallic materials - vickers hardness test - Part 1: Test method; 2005.
20. ISO 9015-2:2003. Destructive tests on welds in metallic materials - hardness testing - Part 2: Microhardness testing of welded joints; 2003.
21. Det Norske Veritas. Qualification and approval of hybrid laser-arc welding in shipbuilding. Guidelines no 19; 2006.
22. EN 15305:2008 non-destructive testing. Test method for residual stress analysis by X-ray diffraction.
23. ISO 12932:2013: welding – Laser-arc hybrid welding of steels, nickel and nickel alloys – Quality levels for imperfections; 2013.
24. Hensel J, Nitschke-Pagel T, Dilger K. Residual stress relaxation in welded steel joints – an experimentally-based model. In: International conference on residual stresses ICRS10, Sydney; 2016.
25. Hensel J, Nitschke-Pagel T, Dilger K. Engineering model for the quantitative consideration of residual stresses in fatigue design of welded components. International Institute of welding (IIW), Document XIII-2642-16; 2016.
26. Crack propagation in welded stiffened panels10.1016/S0143-974X(01)00094-3 ↗
27. Full-scale fatigue tests of ship structures to validate the S-N approaches for fatigue strength assessment10.1016/j.marstruc.2010.01.004 ↗
28. Fatigue strength investigations of welded details of stiffened plate structures in steel ships10.1016/j.ijfatigue.2011.01.021 ↗