TY - JOUR

T1 - Fatigue behaviour of multi-spot joints of 2024-T3 aluminium sheets obtained by refill Friction Stir Spot Welding with polysulfide sealant

AU - Bernardi, Matteo

AU - Suhuddin, Uceu F.H.

AU - Fu, Banglong

AU - Gerber, Juliano P.

AU - Bianchi, Mateus

AU - Ostrovsky, Ilya

AU - Sievers, Bjoern

AU - Faes, Koen

AU - Maawad, Emad

AU - Lazzeri, Luigi

AU - dos Santos, Jorge F.

AU - Klusemann, Benjamin

N1 - Publisher Copyright: © 2023 Elsevier Ltd

PY - 2023/7/1

Y1 - 2023/7/1

N2 - The aeronautical industry is looking with interest at friction-based welding for many years due to weight-saving capacities, where fusion-based welding problems can be avoided, allowing also the joining of materials considered complicated to weld with other technologies. Refill Friction Stir Spot Welding (refill FSSW) is a solid-state joining process that shows great potential to be a substitute for single-point joining processes like riveting. The main objective of this study is to investigate the mechanical behaviour of multi-spot joints of AA 2024-T3 obtained by refill FSSW with the addition of a sealant commonly used in riveted joints by the aviation industry. A fatigue test campaign was carried out on the joints with and without sealant to evaluate the possible synergy between the refill FSSW and sealant. The fatigue data obtained are statistically analyzed and compared. According to the comprehensive study including macro- and micro-structure, deformation strain field, residual stress distribution as well as the fatigue crack growth behaviour, the underlying history of multi-spot joints fatigue damage is revealed. The overall results prove that producing lap-joints by refill FSSW with sealant improves considerably the fatigue performance.

AB - The aeronautical industry is looking with interest at friction-based welding for many years due to weight-saving capacities, where fusion-based welding problems can be avoided, allowing also the joining of materials considered complicated to weld with other technologies. Refill Friction Stir Spot Welding (refill FSSW) is a solid-state joining process that shows great potential to be a substitute for single-point joining processes like riveting. The main objective of this study is to investigate the mechanical behaviour of multi-spot joints of AA 2024-T3 obtained by refill FSSW with the addition of a sealant commonly used in riveted joints by the aviation industry. A fatigue test campaign was carried out on the joints with and without sealant to evaluate the possible synergy between the refill FSSW and sealant. The fatigue data obtained are statistically analyzed and compared. According to the comprehensive study including macro- and micro-structure, deformation strain field, residual stress distribution as well as the fatigue crack growth behaviour, the underlying history of multi-spot joints fatigue damage is revealed. The overall results prove that producing lap-joints by refill FSSW with sealant improves considerably the fatigue performance.

KW - Aluminum alloy

KW - Fatigue

KW - Multiple site damage

KW - Refill friction stir spot welding

KW - Sealant

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85151022867&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/74ab323c-2aec-3279-93f4-0a12878d53ae/

U2 - 10.1016/j.ijfatigue.2023.107539

DO - 10.1016/j.ijfatigue.2023.107539

M3 - Journal articles

AN - SCOPUS:85151022867

VL - 172

JO - International Journal of Fatigue

JF - International Journal of Fatigue

SN - 0142-1123

M1 - 107539

ER -