PSI - Issue 61

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ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Structural Integrity Procedia 00 (2023) 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 61 (2024) 285–290

© 2024 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 IWPDF 2023 Chairman Abstract The application of nanocomposites in several industrial applications has been increasing due to their good specific strength and stiffness. In this context, carbon nanofibers (CNFs) are the most promising carbon-based nanoparticles due to their good mechanical, electrical, and thermal properties. Therefore, because they are widely used with epoxy resins for application in various industrial sectors (railway, automotive, aeronautics, and process industries), it is necessary to understand their interaction during the manufacturing process. Consequently, the main goal of this study is to analyze the effect of suspension viscosity on mechanical properties. For this purpose, different tests were carried out, such as resin viscosity tests, measurement of the contact angle between CNFs and resin, as well as shrinkage tests. The effect of cure temperature, between 5ºC and 40ºC, on the mechanical performance of nanocomposites was also evaluated. It was possible to conclude that CNFs increase the viscosity between 27.3% and 74.7% depending on the resin, and the shrinkage effect decreases from 3.2% to 0.5%. For all the materials studied, an increase in cure temperature decreases the flexural strength. Considering a cure temperature of 40ºC, neat Sicomin resin has a flexural strength of 91.4 MPa, but when it decreases to 5ºC there is an increase of 38.4%. The same comparison for neat Ebalta resin leads to values of 92.3 MPa and 27.8%, respectively. © 2024 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) Impact of cure Temperature and suspension viscosity on the Mechanical Properties of Carbon Nanofiber-Reinforced Epoxy Resin Nanocomposites J.M. Parente a *, A.P. Silva a , P.N.B. Reis a C-MAST, Department of Electromechanical Engineering, University of Beira Interior, Calçada Fonte do Lameiro, 6201-100 Covilhã, Portugal b University of Coimbra, CEMMPRE, ARISE, Department of Mechanical Engineering, 3030-788 Coimbra, Portugal Abstract The application of nanocomposites in several industrial applications has been increasing due to their good specific strength and stiffness. In this context, carbon nanofibers (CNFs) are the most promising carbon-based nanoparticles due to their good mechanical, electrical, and thermal properties. Therefore, because they are widely used with epoxy resins for application in various industrial sectors (railway, automotive, aeronautics, and process industries), it is necessary to understand their interaction during the manufacturing process. Consequently, the main goal of this study is to analyze the effect of suspension viscosity on mechanical properties. For this purpose, different tests were carried out, such as resin viscosity tests, measurement of the contact angle between CNFs and resin, as well as shrinkage tests. The effect of cure temperature, between 5ºC and 40ºC, on the mechanical performance of nanocomposites was also evaluated. It was possible to conclude that CNFs increase the viscosity between 27.3% and 74.7% depending on the resin, and the shrinkage effect decreases from 3.2% to 0.5%. For all the materials studied, an increase in cure temperature decreases the flexural strength. Considering a cure temperature of 40ºC, neat Sicomin resin has a flexural strength of 91.4 MPa, but when it decreases to 5ºC there is an increase of 38.4%. The same comparison for neat Ebalta resin leads to values of 92.3 MPa and 27.8%, respectively. © 2024 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 IWPDF 2023 Keywords: Carbon nanofibers; Nanocomposites; Cure temperature; Mechanical properties 3rd International Workshop on Plasticity, Damage and Fracture of Engineering Materials (IWPDF 2023) Impact of cure Temperature and suspension viscosity on the Mechanical Properties of Carbon Nanofiber-Reinforced Epoxy Resin Nanocomposites J.M. Parente a *, A.P. Silva a , P.N.B. Reis a C-MAST, Department of Electromechanical Engineering, University of Beira Interior, Calçada Fonte do Lameiro, 6201-100 Covilhã, Portugal b University of Coimbra, CEMMPRE, ARISE, Department of Mechanical Engineering, 3030-788 Coimbra, Portugal 3rd International Workshop on Plasticity, Damage and Fracture of Engineering Materials (IWPDF 2023) Peer-review under responsibility of the scientific committee of IWPDF 2023 Keywords: Carbon nanofibers; Nanocomposites; Cure temperature; Mechanical properties

* Corresponding author. E-mail address: joao.miguel.parente@ubi.pt * Corresponding author. E-mail address: joao.miguel.parente@ubi.pt

2452-3216 © 2024 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 IWPDF 2023 2452-3216 © 2024 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 IWPDF 2023

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