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Effect of welding defects on plastic behaviour and fatigue lifetime of friction stir welded Al-Cu-Li alloy

Abstract : The effects of joint line remnant (JLR), kissing bond (KB), and clearance between the sheets (Gap) on tensile and fatigue properties of 2198-T851 friction stir welds have been quantitatively evaluated with respect to a reference weld made using one single sheet. The JLR has no significant influence in the investigated conditions. KB and Gap-induced defects do not significantly influence plastic yield but may induce premature crack initiation by ductile tearing and intergranular decohesions respectively. A critical value for KB opening (280 MPa), a threshold value for fatigue crack propagation from the KB (1 MPa√m) and crack growth rates consistent with literature data have been determined.
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Submitted on : Thursday, November 14, 2013 - 3:29:24 PM
Last modification on : Thursday, September 24, 2020 - 6:30:07 PM
Long-term archiving on: : Saturday, February 15, 2014 - 4:29:05 AM

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Thomas Le Jolu, Thilo F. Morgeneyer, Anne Denquin, Anne-Françoise Gourgues-Lorenzon. Effect of welding defects on plastic behaviour and fatigue lifetime of friction stir welded Al-Cu-Li alloy. 13th international conference on fracture, Jun 2013, Beijing, China. 10 p. ⟨hal-00853558⟩

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