PSI - Issue 41

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

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

ScienceDirect

Procedia Structural Integrity 41 (2022) 48–59

© 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 In real applications, adhesive joints are subjected to mixed mode I+II loading. The tests developed for mixed-mode loading are complex but considered highly relevant for fracture characterization. There are several mixed-mode tests, of which the Mixed Mode Bending (MMB) test stands out for its capacity to allow the variation of the mixed-mode ratio practically without limitations. However, although there are several proposals for MMB test device configurations, this test is still considered complex, and some of the current solutions do not allow performing the test on stiffer materials. In this work, the main objective is to design, numerically model and experimentally validate an MMB test equipment to perform structural adhesive tests. Experimentally, it is intended to design and manufacture the MMB test equipment, and subsequently carry out the respective tests. The end result should be an equipment that enables obtaining various mixed-mode combinations, using a single equipment and the same type of test specimen, for further application in the design of adhesively-bonded joints. The equipment was validated by fabricating and testing adhesive joints, although further validation should contemplate estimating the mixed-mode behaviour of adhesive joints and comparing it with literature data. © 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: Mixed-Mode Bending; adhesive joints; structural adhesives; fracture mechanics; fracture envelope; fracture toughness. 2nd Mediterranean Conference on Fracture and Structural Integrity esign and validation of ixed- ode device for fracture toughness analysis of adhesive joints A.R.F. Soares a , R.D.S.G. Campilho a , b , *, F.J.P. Chaves c , I.J. Sánchez-Arce b , J.M.F.S. Fecheira a , F.J.G. Silva a,b , P.M.D. Carvalho a a Departamento de Engenharia Mecânica, Instituto Superior de Engenharia de Porto. Instituto Politécnico do Porto. Rua Dr. António Bernardino de Almeida 431, Porto, 4200-072, Portugal. b INEGI, Instituto de Ciência e Inovação em Engenharia Mecânica e Engenharia Industrial. Pólo da FEUP, Rua Dr. Roberto Frias 400, Porto, 4200-465, Portugal c IPCA, Instituto Politécnico do Cávado e do Ave, Vila Frescaínha S. Martinho, Barcelos, 4750-810, Portugal. Abstract In real applications, adhesive joints are subjected to mixed mode I+II loading. The tests developed for mixed-mode loading are complex but considered highly relevant for fracture characterization. There are several mixed-mode tests, of which the Mixed Mode Bending (MMB) test stands out for its capacity to allow the variation of the mixed-mode ratio practically without limitations. However, although there are several proposals for MMB test device configurations, this test is still considered complex, and some of the current solutions do not allow performing the test on stiffer materials. In this work, the main objective is to design, numerically model and experimentally validate an MMB test equipment to perform structural adhesive tests. Experimentally, it is intended to design and manufacture the MMB test equipment, and subsequently carry out the respective tests. The end result should be an equipment that enables obtaining various mixed-mode combinations, using a single equipment and the same type of test specimen, for further application in the design of adhesively-bonded joints. The equipment was validated by fabricating and testing adhesive joints, although further validation should contemplate estimating the mixed-mode behaviour of adhesive joints and comparing it with literature data. © 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: Mixed-Mode Bending; adhesive joints; structural adhesives; fracture mechanics; fracture envelope; fracture toughness. 2nd Mediterranean Conference on Fracture and Structural Integrity Design and validation of mixed-mode device for fracture toughness analysis of adhesive joints A.R.F. Soares a , R.D.S.G. Campilho a , b , *, F.J.P. Chaves c , I.J. Sánchez-Arce b , J.M.F.S. Fecheira a , F.J.G. Silva a,b , P.M.D. Carvalho a a Departamento de Engenharia Mecânica, Instituto Superior de Engenharia de Porto. Instituto Politécnico do Porto. Rua Dr. António Bernardino de Almeida 431, Porto, 4200-072, Portugal. b INEGI, Instituto de Ciência e Inovação em Engenharia Mecânica e Engenharia Industrial. Pólo da FEUP, Rua Dr. Roberto Frias 400, Porto, 4200-465, Portugal c IPCA, Instituto Politécnico do Cávado e do Ave, Vila Frescaínha S. Martinho, Barcelos, 4750-810, Portugal.

* Corresponding author. Tel.: + 351-939-526-892. E-mail address: raulcampilho@gmail.com * Corresponding author. Tel.: + 351-939-526-892. 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.2022.05.007