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Effect of friction stir weld defects on fatigue lifetime of an Al-Cu-Li alloy

Abstract : The effect of Joint Line Remnant (JLR) on the fatigue lifetime of friction stir welds of a 2198Al-alloy in T851 condition has been assessed experimentally by investigating "JLR-free"welds (welded in one sheet) and "JLR-bearing" welds (produced by welding 2 sheets with anatural oxide layer). A strong decrease in Microhardness is found for the weakest weld zonetogether with a reduction in tensile properties compared to the base material, namely, 45% inyield strength and 22% in ultimate tensile strength. The fatigue strength of JLR-free and JLRbearingwelds at 105 cycles (R=0.1) is reduced by 10% and 15% respectively compared tothe base material. No obvious effect of JLR was evidenced concerning crack initiationmechanisms.
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Thomas Le Jolu, Thilo F. Morgeneyer, Anne-Françoise Gourgues-Lorenzon. Effect of friction stir weld defects on fatigue lifetime of an Al-Cu-Li alloy. Fracture of materials and structures from micro to macro scale - ECF 18, Aug 2010, Dresden, Germany. 8 p. ⟨hal-00541248⟩

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