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Analysis of residual stress and fatigue crack propagation behaviour in laser welded aerospace Aluminium T-joints
Citation Link: https://doi.org/10.15480/882.1036
Other Titles
Analyse des Eigenspannungen und Ermüdungsverhalten der Riss-Verbreitung in Laser T-geschweißte Luft- und Raumfahrt Aluminium Joint
Publikationstyp
Doctoral Thesis
Publikationsdatum
2011
Sprache
English
Author
Advisor
Title Granting Institution
Technische Universität Hamburg
Place of Title Granting Institution
Hamburg
Examination Date
2011-11-02
Residual stress distribution of different configurations of laser beam welded (LBW) “skin-clip” T-joints of aerospace Aluminium alloys were determined by analyses using commercial FE code SYSWELD and by measurements using neutron diffraction technique. Fatigue crack propagation of notched middle tension panels with single central clip under constant amplitude cyclic loading and crack path development were carefully monitored to capture any possible effect of the welding process, residual stress state and local geometry of the weld seam area. The beneficial effect of the LBW process optimisation on the residual stress evolution was successfully demonstrated. A good correlation between the experimental measurements and the numerical analysis was found describing the residual stress distribution for panels containing central LBW clip weld. The influence of residual stresses on FCP behaviour of the panels was clearly shown as enhancing the fatigue properties of the welded panels by residual stress state change via process optimization.
Schlagworte
residual stress
fatigue crack propagation
laser beam welding
Aluminium alloy
T-joint
DDC Class
620:Engineering and allied operations
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Funda_PhD_02Nov2011.pdf
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