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Fatigue properties of combined friction stir and adhesively bonded AA6082‐T6 overlap joints
Author(s) -
Maciel Ricardo,
Bento Tiago,
Braga Daniel F.O.,
Silva Lucas F.M.,
Moreira Pedro M.G.P.,
Infante Virgínia
Publication year - 2020
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.13287
Subject(s) - friction stir welding , materials science , composite material , welding , quasistatic process , adhesive , butt joint , joint (building) , adhesive bonding , differential scanning calorimetry , curing (chemistry) , bonding strength , structural engineering , metallurgy , layer (electronics) , physics , quantum mechanics , engineering , thermodynamics
Even though friction stir welding (FSW) has been shown to produce high performing butt joints, stress concentration at the weld edges in overlap FSW significantly reduces the performance of these joints. By combining FSW and adhesive bonding into a friction stir (FS) weld bonding, joint mechanical performance is greatly improved. Quasistatic and fatigue strength of the proposed FS weld‐bonding joints was assessed and benchmarked against overlap FSW and adhesive bonding. The characterization of the structural adhesive is also presented, including differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), as well as mechanical characterization with curing temperature. A small process parameter study was made to select proper FSW parameters for AA6082‐T6 overlap FSW and FS weld‐bonded joints. FS weld bonding achieved a significant increase in quasistatic and fatigue strength when compared with overlap FSW, with 79.9% of the fatigue strength of adhesive‐bonded joints at 10 6 cycles, whereas FSW had 41.6%.