PSI - Issue 41

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 ScienceD rect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 41 (2022) 24–35

© 2022 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 MedFract2Guest Editors. Abstract At the present time, adhesive joints are widely used in the industry, replacing mechanical and welding joints in many applications. T-joints are used in many applications such as automotive, marine, and aerospace industries. Several methodologies have been proposed to reduce the stress concentration at bonding ends and to obtain a more uniform stress distribution along the bondline, such as optimization of the overlap length ( L O ) or the adhesives’ thickness, adding outer or inner chamfers, using adh esive fillets, and dual-adhesives. Aiming to improve the strength of T-joints, in this work the dual-adhesive technique is studied, consisting of using two adhesives, placing a more flexible adhesive at the overlap ends and a stiffer one in the central area. To test this method in T-joints, different adhesive ratios were applied. To evaluate this concept, a numerical study was carried out using the cohesive zone modelling (CZM) technique, in the ABAQUS ® software, including a study of failure modes, stresses, strength or maximum load ( P m ) and dissipated energy ( U ). With the present work, 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 increases in P m and U in relation to single-adhesive joints (SAJ). © 2022 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 MedFract2Guest Editors. Keywords: Adhesive joints; T-joints; Structural adhesive; Finite element method; Dual-adhesive; Cohesive zone models; Fracture toughness. 2nd Mediterranean Conference on Fracture and Structural Integrity Adhesively-bonded T-joint cohesive zone analysis using dual adhesives P.M.D. Carvalho a , R.D.S.G. Campilho a,b, *, I.J. Sánchez-Arce b , R.J.B. Rocha b , A.R.F. Soares a a Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do 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 Abstract At the present time, adhesive joints are widely used in the industry, replacing mechanical and welding joints in many applications. T-joints ar used in many appl cations such as automotive, ma ine, and aerospace industries. Several methodologies have been proposed to reduce the stress concentration at bonding ends and to obtain a more uniform stress distribution alon the bondline, such as optimization of th overlap length ( L O ) or the adhesives’ thickness, adding outer or inner chamfers, using adh esive fillets, and dual-adhesives. Aiming to im rove e strengt of T-jo nt , in this work the dual-adhes ve te nique is studied, consisting of using two adhesives, placing a more fl xible adhesive at the overlap ends and a stiffer one in the e tral area. To test thi meth d in T-joints, ifferent adhesive ratios w re applied. To evaluate this co cept, a numerical study was carried out using the coh sive zone modelling (CZM) t chnique, in the ABAQUS ® software, includi g a study of failure modes, stress s, strength or maximum l ad ( P m ) and dissipated e ergy ( U ). With the pre ent work, it was initiall possibl to validat the CZM technique with experiment l results. The umerical work that followed showed that the strength of T-joints significantly d pe ds on the comb nation of adhesives used and that it is possible t achieve increases in P m and U in relati n o ingle-adhesive joi t (SAJ). © 2022 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 MedFract2Guest Editors. Keywords: Adhesive joints; T-joints; Structural adhesive; Finite element method; Dual-adhesive; Cohesive zone models; Fracture toughness. 2nd Mediterranean Conference on Fracture and Structural Integrity Adhesively-bonded T-joint cohesive zone analysis using dual adhesives P.M.D. Carvalho a , R.D.S.G. Campilho a,b, *, I.J. Sánchez-Arce b , R.J.B. Rocha b , A.R.F. Soares a a Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do 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

* Corresponding author. Tel: +351939526892; Fax: +351228321159. E-mail address: raulcampilho@gmail.com * Corresponding author. Tel: +351939526892; Fax: +351228321159. E-mail address: raulcampilho@gmail.com

2452-3216 © 2022 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 MedFract2Guest Editors. 2452-3216 © 2022 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 MedFract2Guest Editors.

2452-3216 © 2022 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 MedFract2Guest Editors. 10.1016/j.prostr.2022.05.005