PSI - Issue 51

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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 51 (2023) 17–23

© 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 ICSID 2022 Organizers Abstract The wide use of adhesive joints supposes that accurate strength predictions methods exist for design. Cohesive zone models (CZM) consist of the most accepted method, although the fracture toughness ( G C ) of the adhesive in the different loading modes should be firstly characterized, and the mixed-mode behavior or fracture envelope known. This work experimentally evaluates the cracked lap shear (CLS) test for mixed-mode G C assessment of two epoxy adhesives. Different theoretical reduction methods were evaluated. The work consisted of testing CLS specimens with the different adhesives, and carrying out the respective data processing. Results showed that the model of Brussat et al. led to offset results compared to the other methods. © 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 ICSID 2022 Organizers Keywords: Adhesive joints; structural adhesive; cracked-lap shear test; fracture. 1. Introduction Adhesive joint fracture tests under mixed-mode are based on pure-mode fracture specimens, although the loading setup is different. For these tests, the mixed-mode ratio is defined as 1 II I tan / G G    , considering G I the tensile and G II the shear fracture energy. Mode-mixity can be assessed by different tests (da Silva et al. 2011), either with constant or variable  . A simple solution consists of the asymmetric double-cantilever beam (ADCB) test, in which the joints include adherends with different thicknesses or materials, such that shear becomes present in the loading (da Silva et 6th International Conference on Structural Integrity and Durability (ICSID 2022) Experimental analysis on the mixed-mode fracture behavior of structural adhesives R.B.P. Barros a , R.D.S.G. Campilho a,b, *, I.J. Sánchez-Arce b , J.M.M. Dionísio a , K.Madani c a 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 The wide use of adhesive joints supposes that accurate strength predictions methods exist for design. Cohesive zone models (CZM) consist of the most accepted method, although the fracture toughness ( G C ) of the adhesive in the different loading modes should be firstly characterized, and the mixed-mode behavior or fracture envelope known. This work experimentally evaluates the cracked lap shear (CLS) test for mixed-mode G C assessment of two epoxy adhesives. Different theoretical reduction methods were evaluated. The work consisted of testing CLS specimens with the different adhesives, and carrying out the respective data processing. Results showed that the model of Brussat et al. led to offset results compared to the other methods. © 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 ICSID 2022 Organizers Keywords: Adhesive joints; structural adhesive; cracked-lap shear test; fracture. 1. Introduction Adhesive joint fracture tests under mixed-mode are based on pure-mode fracture specimens, although the loading setup is different. For these tests, the mixed-mode ratio is defined as 1 II I tan / G G    , considering G I the tensile and G II the shear fracture energy. Mode-mixity can be assessed by different tests (da Silva et al. 2011), either with constant or variable  . A simple solution consists of the asymmetric double-cantilever beam (ADCB) test, in which the joints include adherends with different thicknesses or materials, such that shear becomes present in the loading (da Silva et 6th International Conference on Structural Integrity and Durability (ICSID 2022) Experimental analysis on the mixed-mode fracture behavior of structural adhesives R.B.P. Barros a , R.D.S.G. Campilho a,b, *, I.J. Sánchez-Arce b , J.M.M. Dionísio a , K.Madani c a 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 © 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 ICSID 2022 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 ICSID 2022 Organizers

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