PSI - Issue 47

ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Structural Integrity Procedia 00 (2022) 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 47 (2023) 70–79

© 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 IGF27 chairpersons Abstract Tubular adhesive joints joints are mostly subjected to axial or torsional loads. Under axial loads, tubular lap joints (TLJ) lead to peak stresses in the adhesive identically to single-lap joints. An alternative to mitigate these peak stresses is to consider tube chamfers at the bonding portions, i.e., a tubular scarf joint (TSJ). This joint enables joining tubes with identical diameters, and the chamfer geometry provides a large bonding area, if the scarf angle (  ) is sufficiently small. Thus, high joint strengths can be achieved. The proposed work is mainly numerical, and it addresses the tensile behaviour of TSJ between aluminium alloy adherends, and  between 45° and 3.43°, considering different adhesive types. Initial validation of the cohesive zone model (CZM) is accomplished by comparing experimental and numerical data of TLJ. The numerical CZM study that follows addresses peel ( σ y ) and shear stresses ( τ xy ) in the adhesive layer, failure path, and maximum load ( P m ), as a function of  and the adhesive type. The CZM was successfully validated, and clear guidelines were found regarding the best  and adhesive combinations. © 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 IGF27 chairpersons Keywords: Adhesive joints, Tubular adhesive joints, Scarf joints, Finite element method, Cohesive zone models. 1. Introduction Adhesive bonding allows the joining of similar and dissimilar materials while also providing a strong and lightweight connection; hence, its widespread application in engineering practice (Adams 2005). The single-lap joint (SLJ) is commonly employed due to its simplicity. However, the offset between the adherends leads to eccentric Abstract Tubular adhesive joints joints are mostly subjected to axial or torsional loads. Under axial loads, tubular lap joints (TLJ) lead to peak stresses in the adhesive identically to single-lap joints. An alternative to mitigate these peak stresses is to consider tube chamfers at the bonding portions, i.e., a tubular scarf joint (TSJ). This joint enables joining tubes with identical diameters, and the chamfer geometry provides a large bonding area, if the scarf angle (  ) is sufficiently small. Thus, high joint strengths can be achieved. The proposed work is mainly numerical, and it addresses the tensile behaviour of TSJ between aluminium alloy adherends, and  between 45° and 3.43°, considering different adhesive types. Initial validation of the cohesive zone model (CZM) is accomplished by comparing experimental and numerical data of TLJ. The numerical CZM study that follows addresses peel ( σ y ) and shear stresses ( τ xy ) in the adhesive layer, failure path, and maximum load ( P m ), as a function of  and the adhesive type. The CZM was successfully validated, and clear guidelines were found regarding the best  and adhesive combinations. © 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 IGF27 chairpersons Keywords: Adhesive joints, Tubular adhesive joints, Scarf joints, Finite element method, Cohesive zone models. 1. Introduction Adhesive bonding allows the joining of similar and dissimilar materials while also providing a strong and lightweight connection; hence, its widespread application in engineering practice (Adams 2005). The single-lap joint (SLJ) is commonly employed due to its simplicity. However, the offset between the adherends leads to eccentric 27th International Conference on Fracture and Structural Integrity (IGF27) Effect of adhesive type on the tensile behavior of tubular scarf adhesive joints J.E.S.M. Silva a , R.D.S.G. Campilho a,b, *, I.J. Sánchez-Arce b , R.D.F. Moreira b a ISEP – School of Engineering, Polytechnic of Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal b INEGI – Pólo FEUP, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal 27th International Conference on Fracture and Structural Integrity (IGF27) Effect of adhesive type on the tensile behavior of tubular scarf adhesive joints J.E.S.M. Silva a , R.D.S.G. Campilho a,b, *, I.J. Sánchez-Arce b , R.D.F. Moreira b a ISEP – School of Engineering, Polytechnic of Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal b INEGI – Pólo FEUP, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal

* 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 IGF27 chairpersons 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 IGF27 chairpersons

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 IGF27 chairpersons 10.1016/j.prostr.2023.06.042