ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The residual stress distribution in three laser welded T-joint configurations of aerospacealuminium alloys were measured using neutron diffraction and FE-simulation was conducted tocompare with the experimental results. A 2 mm thick AA 6013 T6 sheet (as clip) was welded to a4.5 mm thick and 400 mm wide AA 6156 T4 base plate (as skin of the airframe). In two samples,the thickness of the plate was reduced in some areas after welding to produce so-called “pockets”with the purpose of the weight reduction to resemble the fabrication practise in aircraft industry.The effect of pocketing process, which produced two different geometries around the clip weld onthe residual stress evolution was analysed. In the plain sample (without pockets), residual stresseswere predicted using the SYSWELD finite element software. The strain measurements on the baseplate were performed at three locations; namely, the middle of the weld length (mid-clip), weldingstart (run-in) and end (run-out) locations.In all welded plates, slightly higher longitudinal tensile residual stresses were detected at the midcliplocations, whereas transverse residual stresses were similar for all locations. In the run-outlocation, higher longitudinal tensile residual stresses were present than in the run-in location, whichwas the case in our previous results on other samples.The first results of the SYSWELD FE-simulation of the plain sample were compared withexperimental results. The comparison has shown particularly good agreement for the transversestresses. Although the simulation yields higher longitudinal tensile stresses than the experimentalresults, the stress distributions were very similar
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.355.pdf
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