PSI - Issue 77

ScienceDirect Structural Integrity Procedia 00 (2026) 000–000 Structural Integrity Procedia 00 (2026) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 77 (2026) 87–94

© 2026 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 ICSI organizers Abstract Industries such as aerospace and automotive prioritize safety, making impact resistance a crucial factor in structural performance. Dual-adhesive joints (DAJ), which combine a stiff adhesive in the central region with a more flexible adhesive at the edges, enhance stress distribution and improve joint durability, providing a more reliable and efficient bonding solution. This work aims to improve the DAJ impact behaviour with steel adherends by applying geometrical modifications (outer and inner chamfers, and adhesive fillets) and considering different adhesive combinations. A numerical study was conducted using cohesive zone modelling (CZM), encompassing an analysis of peel ( σ y ) and shear ( τ xy ) stresses, maximum load ( P m ), and dissipated energy ( U ). Validation with experimental data was successfully carried out. The strategic use of DAJ combinations and targeted geometric modifications can effectively enhance the impact behaviour of adhesively bonded joints. © 2026 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 ICSI organizers Keywords: Adhesively-bonded joint; Dual-adhesive joint; Impact loading; Numerical modelling. 1. Introduction Adhesive joints have gained interest in material assembling as they offer numerous advantages compared to traditional mechanical joints (bolting, riveting, and welding) (Brockmann et al. 2008) due to their high strength/weight International Conference on Structural Integrity Impact strength optimization of dual-adhesive joints by cohesive zone modelling L.A.S. Maia a , R.D.S.G. Campilho a,b *,J.F.B. Martins a , A.J.A. Vieira a , D.C. Gonçalves a , K. Madani c a CIDEM, ISEP-School of Engineering, Polytechnic of Porto, R. Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal. b INEGI – 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, 22000, Sidi Bel Abbes, Algeria. Abstract Industries such as aerospace and automotive prioritize safety, making impact resistance a crucial factor in structural performance. Dual-adhesive joints (DAJ), which combine a stiff adhesive in the central region with a more flexible adhesive at the edges, enhance stress distribution and improve joint durability, providing a more reliable and efficient bonding solution. This work aims to improve the DAJ impact behaviour with steel adherends by applying geometrical modifications (outer and inner chamfers, and adhesive fillets) and considering different adhesive combinations. A numerical study was conducted using cohesive zone modelling (CZM), encompassing an analysis of peel ( σ y ) and shear ( τ xy ) stresses, maximum load ( P m ), and dissipated energy ( U ). Validation with experimental data was successfully carried out. The strategic use of DAJ combinations and targeted geometric modifications can effectively enhance the impact behaviour of adhesively bonded joints. © 2026 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 ICSI organizers Keywords: Adhesively-bonded joint; Dual-adhesive joint; Impact loading; Numerical modelling. 1. Introduction Adhesive joints have gained interest in material assembling as they offer numerous advantages compared to traditional mechanical joints (bolting, riveting, and welding) (Brockmann et al. 2008) due to their high strength/weight International Conference on Structural Integrity Impact strength optimization of dual-adhesive joints by cohesive zone modelling L.A.S. Maia a , R.D.S.G. Campilho a,b *,J.F.B. Martins a , A.J.A. Vieira a , D.C. Gonçalves a , K. Madani c a CIDEM, ISEP-School of Engineering, Polytechnic of Porto, R. Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal. b INEGI – 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, 22000, Sidi Bel Abbes, 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 © 2026 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 ICSI organizers 2452-3216 © 2026 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 ICSI organizers

2452-3216 © 2026 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 ICSI organizers 10.1016/j.prostr.2026.01.013