PSI - Issue 54

ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 54 (2024) 398–405

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers Abstract Industry's continuous search for improved production methods has led to an increase in the use of adhesive bonding with the aim of replacing traditional techniques such as bolting, riveting and welding. This approach, prevalent in the aerospace and automotive sectors, benefits from advanced computer-aided numerical methods for design, joint strength prediction and solution validation. Researchers have proposed several modifications, including geometry and materials, for optimising conventional designs. In this study is analysed single-step joints with single and double adhesive, employing AW 6082-T651 aluminium adherends. Three adhesives are tested, ranging from the most fragile to the most ductile, as well as various combinations of dual-adhesive. The numerical procedure is validated by experimental work and cohesive zone models (CZM) assist the numerical analysis, covering the strength prediction and the energy up to failure. The results indicate that the dual-adhesive technique does not significantly increase the joint strength when compared to single adhesive joints. However, it exhibits notable improvements in damage tolerance and dissipated energy, particularly in joints with longer overlap lengths. © 2023 The Authors, Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers Keywords: Stepped-lap joint; Dual-adhesive joints; Structural adhesive; Cohesive zone models; Strength prediction; Geometrical modifications International Conference on Structural Integrity 2023 (ICSI 2023) Application of the dual-adhesive technique for static improvement of single-step joints D.F.T. Carvalho a , R.D.S.G. Campilho a,b *, L.D.C. Ramalho b , R.D.F. Moreira a,b , K. Madani c a ISEP — School of Engineering, Polytechnic of Porto, R. Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal. b INEGI — Institute of Science and Innovation in Mechanical and Industrial Engineering, Pólo FEUP, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal. c Department of Mechanical Engineering, University of Sidi Bel Abbes, BP 89 Cité Ben M’hidi, Sidi Bel Abbes 22000, Algeria. Abstract Industry's continuous search for improved production methods has led to an increase in the use of adhesive bonding with the aim of replacing traditional techniques such as bolting, riveting and welding. This approach, prevalent in the aerospace and automotive sectors, benefits from advanced computer-aided numerical methods for design, joint strength prediction and solution validation. Researchers have proposed several modifications, including geometry and materials, for optimising conventional designs. In this study is analysed single-step joints with single and double adhesive, employing AW 6082-T651 aluminium adherends. Three adhesives are tested, ranging from the most fragile to the most ductile, as well as various combinations of dual-adhesive. The numerical procedure is validated by experimental work and cohesive zone models (CZM) assist the numerical analysis, covering the strength prediction and the energy up to failure. The results indicate that the dual-adhesive technique does not significantly increase the joint strength when compared to single adhesive joints. However, it exhibits notable improvements in damage tolerance and dissipated energy, particularly in joints with longer overlap lengths. © 2023 The Authors, Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers Keywords: Stepped-lap joint; Dual-adhesive joints; Structural adhesive; Cohesive zone models; Strength prediction; Geometrical modifications International Conference on Structural Integrity 2023 (ICSI 2023) Application of the dual-adhesive technique for static improvement of single-step joints D.F.T. Carvalho a , R.D.S.G. Campilho a,b *, L.D.C. Ramalho b , R.D.F. Moreira a,b , K. Madani c a ISEP — School of Engineering, Polytechnic of Porto, R. Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal. b INEGI — Institute of Science and Innovation in Mechanical and Industrial Engineering, Pólo FEUP, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal. c Department of Mechanical Engineering, University of Sidi Bel Abbes, BP 89 Cité Ben M’hidi, Sidi Bel Abbes 22000, Algeria.

* Corresponding author. Tel.: +351 939526892; fax: +351 228321159. E-mail address: raulcampilho@gmail.com * Corresponding author. Tel.: +351 939526892; fax: +351 228321159. E-mail address: raulcampilho@gmail.com

2452-3216 © 2023 The Authors, Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers 2452-3216 © 2023 The Authors, Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers 10.1016/j.prostr.2024.01.099