PSI - Issue 25

Available online at www.sciencedirect.com Structural Integrity 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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Procedia Structural Integrity 25 (2020) 234–245

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers In the erospace ndustry there is a constant search for lighter, better p rforming and economically beneficial solutions. To that effec , an altern tive to the more ommon joining techniques such as riveting or screwing, Friction Stir Welding (FSW) merged. This t chniqu allows th manufacture of hig -quality joints w th complex geometry, reducing the production costs. This technique can be further improved if combined w th dhesive applicatio , forming hybrid joints, which exhibit better mechanic l pe formance. H wever, in FSW welds, it i hard o monitor or inspect the integrity of the joi t during its work- ife and that unreliability f ctor is one of the main reasons why its application is not y t widely spread in the industry. Consequently, there is a need for a detailed analysis of the mechanical perf mance during the weldi process and under a variety of loads. To achiev that goal, n this paper th application of Bragg se sors that a low the monitoring of defor ati ns in both manufacturing and service moments s s udied and r sults benchmark d against finite element models. This work aims to demonstrate the potential of a large scale application of this technique in the aeronautical structures. © 2020 The Authors. Published by Elsevier B.V. This is an ope acces article under C BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers 1st Virtual Conference on Structural Integrity - VCSI1 Self-sensing FS Weld-bonded joints for structural monitoring Tiago Bento a *, Ricardo Maciel a , Daniel F.O. Braga a , Lucas da Silva b , Pedro M.G.P. Moreira c , Virgínia Infante a a LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal. 1st Virtual Conference on Structural Integrity - VCSI1 Self-sensing FS Weld-bonded joints for structural monitoring Tiago Bento a *, Ricardo Maciel a , Daniel F.O. Braga a , Lucas da Silva b , Pedro M.G.P. Moreira c , Virgínia Infante a a LAETA, IDMEC, Instituto Superior Técnico, Unive sidad de Lisboa, Av. Rovisco ais, 1049-001 Lisboa, Portugal. b F UP, s , r. rt ri s, s/n 4200-465 orto, ortugal c INEGI, Campus da FEUP, Rua Dr. Roberto Frias, 400 4200-465 Porto, Portugal b FEUP, Campus da FEUP, Rua Dr. Roberto Frias, s/n 4200-465 Porto, Portugal c INEGI, Campus da FEUP, Rua Dr. Roberto Frias, 400 4200-465 Porto, Portugal Abstract Abstract In the aerospace industry there is a constant search for lighter, better performing and economically beneficial solutions. To that effect, an alternative to the more common joining techniques such as riveting or screwing, Friction Stir Welding (FSW) emerged. This technique allows the manufacture of high-quality joints with complex geometry, reducing the production costs. This technique can be further improved if combined with adhesive application, forming hybrid joints, which exhibit better mechanical performance. However, in FSW welds, it is hard to monitor or inspect the integrity of the joint during its work-life and that unreliability factor is one of the main reasons why its application is not yet widely spread in the industry. Consequently, there is a need for a detailed analysis of the mechanical performance during the welding process and under a variety of loads. To achieve that goal, in this paper the application of Bragg sensors that allow the monitoring of deformations in both manufacturing and service moments is studied and results benchmarked against finite element models. This work aims to demonstrate the potential of a large scale application of this technique in the aeronautical structures. Keywords: Friction stir welding; Hybrid joining technique; Bragg fibers; Finite element welded joints mechanical behavior modeling Keywords: Friction stir welding; Hybrid joining technique; Bragg fibers; Finite element welded joints mechanical behavior modeling

* Corresponding author. E-mail address: tiago.bento@tecnico.ulisboa.pt * Correspon ing author E-mail address: tiago.bento@tecnico.ulisboa.pt

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers 2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an ope acces article under C BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the VCSI1 organizers

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers 10.1016/j.prostr.2020.04.028