PSI - Issue 68

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ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 Structural Integrity Procedia 00 (2025) 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 68 (2025) 398–404

European Conference on Fracture 2024 Strength and energetic optimization of dual-adhesive T-joints P.M.D. Carvalho a , R.D.S.G. Campilho a,b *, R.J.B. Rocha b , 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, Sidi Bel Abbes 22000, Algeria. Abstract Adhesive joints are widely used today in industrial sectors. Currently, modelling techniques such as cohesive zone models (CZM) have already demonstrated that it is possible to accurately predict the strength of adhesive joints. However, the harmful effect of peel stress concentrations in adhesive joints should be considered. Aiming to improve the strength of adhesive T-joints, in this work dual-adhesive joints (DAJ) are studied. This technique consists of using two adhesives, placing a more ductile adhesive at the overlap ends and a brittle one in the central area. To test this method in T-joints, various combinations of adhesives are evaluated. Various relative lengths between adhesives along the bondline are tested, always keeping joint symmetry. To evaluate these combinations, a CZM study was carried out. It was initially possible to validate the CZM technique with experimental results. The numerical work that followed showed that the strength of T-joints significantly depends on the combination of adhesives used, and that it is possible to achieve significant increases in strength and dissipated energy relative to single-adhesive joints (SAJ). © 2025 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 ECF24 organizers Keywords: Adhesive joints; T-joints; Dual adhesives; Finite element method; Cohesive zone models. 1. Introduction Adhesive joints have several advantages over conventional joints, such as ease of manufacture, the possibility of joining different materials, more uniform distribution of stresses and low weight, leading to increased use in structural applications (Petrie 2007). However, there are also disadvantages such as low peel strength, difficulties in quality European Conference on Fracture 2024 Strength and energetic optimization of dual-adhesive T-joints P.M.D. Carvalho a , R.D.S.G. Campilho a,b *, R.J.B. Rocha b , 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, Sidi Bel Abbes 22000, Algeria. Abstract Adhesive joints are widely used today in industrial sectors. Currently, modelling techniques such as cohesive zone models (CZM) have already demonstrated that it is possible to accurately predict the strength of adhesive joints. However, the harmful effect of peel stress concentrations in adhesive joints should be considered. Aiming to improve the strength of adhesive T-joints, in this work dual-adhesive joints (DAJ) are studied. This technique consists of using two adhesives, placing a more ductile adhesive at the overlap ends and a brittle one in the central area. To test this method in T-joints, various combinations of adhesives are evaluated. Various relative lengths between adhesives along the bondline are tested, always keeping joint symmetry. To evaluate these combinations, a CZM study was carried out. It was initially possible to validate the CZM technique with experimental results. The numerical work that followed showed that the strength of T-joints significantly depends on the combination of adhesives used, and that it is possible to achieve significant increases in strength and dissipated energy relative to single-adhesive joints (SAJ). © 2025 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 ECF24 organizers Keywords: Adhesive joints; T-joints; Dual adhesives; Finite element method; Cohesive zone models. 1. Introduction Adhesive joints have several advantages over conventional joints, such as ease of manufacture, the possibility of joining different materials, more uniform distribution of stresses and low weight, leading to increased use in structural applications (Petrie 2007). However, there are also disadvantages such as low peel strength, difficulties in quality © 2025 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 ECF24 organizers

* 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 © 2025 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 ECF24 organizers 2452-3216 © 2025 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 ECF24 organizers

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