Journal
MATERIALS & DESIGN
Volume 30, Issue 9, Pages 3367-3373Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2009.03.038
Keywords
Non-ferrous metals and alloys; Surface treatment; Fatigue
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In this investigation the residual stresses generated from friction stir welded (FSW) 2195 aluminum-lithium alloy joints were characterized. The results derived from this research revealed significant levels of tensile residual stresses at the surface and throughout the thickness of the FSW samples. Furthermore, residual stress relaxation at the surface and throughout the thickness of the samples was assessed for laser peened friction stir welded aluminum-lithium joints. To do so the samples were cycled several times at a constant amplitude load. The results indicated that most of the relaxation for the surface residual stresses took place during the first cycle of loading. Also, residual stresses relaxation throughout the thickness of the welded region of unpeened samples significantly exceeded the relaxation exhibited by the laser peened samples. Published by Elsevier Ltd.
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