PSI - Issue 17

Available online at www.sciencedirect.com Structural Int grity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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ScienceDirect

Procedia Structural Integrity 17 (2019) 949–956

ICSI 2019 The 3rd International Conference on Structural Integrity Fatigue Performance of Friction Stir Weld-Bonded Al-Mg joints Ricardo Maciel 1 *, Tiago Bento 1 , Daniel F.O. Braga 1 , Lucas F.M. da Silva 2 , Pedro M.G.P. Moreira 3 , Virgínia Infante 1 1 LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal. ICSI 2019 The 3rd International Conference on Structural Integrity Fatigue Performance of Friction Stir Weld-Bonded Al-Mg joints Ricardo Maciel 1 *, Tiago Bento 1 , Daniel F.O. Braga 1 , Lucas F.M. da Silva 2 , Pedro M.G.P. Moreira 3 , Virgínia Infante 1 1 LAETA, IDMEC, Instituto Superior Técnico, Unive sidad de Lisboa, Av. Rovisco ais, 1049-001 Lisboa, Portugal. 2 FEUP s/n 420 -465 Porto, Portugal 3 INEGI, Campus da FEUP, Rua Dr. Roberto Frias, 400 4200-465 Porto, Portugal The eed for wei ht reduction and l aner manufacturing and ass mbly processes in aircraft construction has led to the pursuit of alternative joining processes to conventional riveting. One such technology that has been co sidered for this application is friction stir welding (FSW). Since it is a solid-state joining method, it results in high performing j ints in a wide range f materials while avoiding overlap lengths and added weight from fasteners, crack stoppers, doublers, etc. However, the adoption of this technology to the assembly of large fuselage shell components is challenging, du to geometric tolerance management requirements. A hybrid friction stir weld-bo ding method combini g overlap friction stir welding and adhesive bonding (AB) has been proposed s an alternativ , aims to incorporate properties and characteristics of both joining technologies, as well as improving damage tolerance. Fatigue perf rmance of single lap joints of AA6082-T6 Al-Mg alloy was assessed and benchmarked against FSW overlap and hybrid friction stir weld-bonding joints. Significant strength and ductility increase wer achieved through the hybridization of the overlap FSW joints. Fatigue strength of the hybrid joints was also higher than FSW overlap joints. 2 FEUP, Campus da FEUP, Rua Dr. Roberto Frias, s/n 4200-465 Porto, Portugal 3 INEGI, Campus da FEUP, Rua Dr. Roberto Frias, 400 4200-465 Porto, Portugal Abstract Abstract The need for weight reduction and leaner manufacturing and assembly processes in aircraft construction has led to the pursuit of alternative joining processes to conventional riveting. One such technology that has been considered for this application is friction stir welding (FSW). Since it is a solid-state joining method, it results in high performing joints in a wide range of materials while avoiding overlap lengths and added weight from fasteners, crack stoppers, doublers, etc. However, the adoption of this technology to the assembly of large fuselage shell components is challenging, due to geometric tolerance management requirements. A hybrid friction stir weld-bonding method combining overlap friction stir welding and adhesive bonding (AB) has been proposed as an alternative, aims to incorporate properties and characteristics of both joining technologies, as well as improving damage tolerance. Fatigue performance of single lap joints of AA6082-T6 Al-Mg alloy was assessed and benchmarked against FSW overlap and hybrid friction stir weld-bonding joints. Significant strength and ductility increase were achieved through the hybridization of the overlap FSW joints. Fatigue strength of the hybrid joints was also higher than FSW overlap joints.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. Keywords: Friction stir welding; adhesive bonding; aluminius alloy; fatigue strength; Keywords: Friction stir welding; adhesive bonding; aluminius alloy; fatigue strength;

* Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: ricardomaciel@tecnico.ulisboa.pt * Correspon ing author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: ricardomaciel@tecnico.ulisboa.pt

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.126