PSI - Issue 28

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 28 (2020) 1816–1826

© 2020 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 European Structural Integrity Society (ESIS) ExCo © 2020 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 European Structural Integrity Society (ESIS) ExCo Abstract Tensile and flexural pr perties of ybrid composites are reasonably well unders ood, but the same is not true for other loading m d s, such as the viscoelastic behaviou . Therefore, this work i tends to study the fibre hybridization effect on the viscoelastic properties of fibre-hybrid composit s. For this purpose, experimental tests were carried ut in bending mod involvin glass and carbon fibres and the results comp red to those obtained with full glass fibre and full carbon laminates. The presence of gl ss fibr s decreases the bending properties and this ecreas increases with the glass fibre content. Independen ly of the material, higher strain rates promote higher maximum bending stresses and bending m dulus. In terms of stress rel xation, and compare to full carbon fibre , th stress value aft r 180 min i 1.2% and 2.6% lower for 6C+2G and 4C+4G l minates, respectively, evidencing the most sensitive behaviour of the glass fibr s to the stress relaxation. R garding the creep behaviour, the dis l cement in reases with the time, and th creep displaceme t after 180 min is greater with the highest cont nt of glass fibers. Compared to full carbon fibers, the displacement value is 0.6% and 2.7% higher for 6C+2G and 4C+4G laminates, respectively. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under th CC BY-NC-ND license (ht ps:// r ativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 1st Virtual European Conference on Fracture The hybridisation effect on the viscoelastic properties of polymeric composites P. Santos a *, S. Valvez a , A. Monjon b , P.N.B. Reis a a C ‐ MAST, Depart. of Electromechanical Engineering, University of Beira Interior, 6201 ‐ 100 Covilhã, Portugal b Depart. of Aeronautic Engineering, University of Beira Interior, 6201 ‐ 100 Covilhã, Portugal Abstract Tensile and flexural properties of hybrid composites are reasonably well understood, but the same is not true for other loading modes, such as the viscoelastic behaviour. Therefore, this work intends to study the fibre hybridization effect on the viscoelastic properties of fibre-hybrid composites. For this purpose, experimental tests were carried out in bending mode involving glass and carbon fibres and the results compared to those obtained with full glass fibre and full carbon laminates. The presence of glass fibres decreases the bending properties and this decrease increases with the glass fibre content. Independently of the material, higher strain rates promote higher maximum bending stresses and bending modulus. In terms of stress relaxation, and compared to full carbon fibres, the stress value after 180 min is 1.2% and 2.6% lower for 6C+2G and 4C+4G laminates, respectively, evidencing the most sensitive behaviour of the glass fibres to the stress relaxation. Regarding the creep behaviour, the displacement increases with the time, and the creep displacement after 180 min is greater with the highest content of glass fibers. Compared to full carbon fibers, the displacement value is 0.6% and 2.7% higher for 6C+2G and 4C+4G laminates, respectively. 1st Virtual European Conference on Fracture The hybridisation effect on the viscoelastic properties of polymeric composites P. Santos a *, S. Valvez a , A. Monjon b , P.N.B. Reis a a C ‐ MAST, Depart. of Electromechan cal E ineering, Univers ty of Be ra Interior, 6201 ‐ 100 C vilhã, Portugal b Depart. of Aeronautic Engineering, University of Beira Interior, 6201 ‐ 100 Covilhã, Portugal

Keywords: Hybrid composites; Mechanical testing; Viscoelastic behaviour. Keywords: Hybrid composites; Mechanical testing; Viscoelastic behaviour.

* Corresponding author E-mail address: paulo.sergio.santos@ubi.pt * Correspon ing author E-mail address: paulo.sergio.santos@ubi.pt

2452-3216 © 2020 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 European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an ope acces article under CC BY-NC-ND license (ht ps:// r ativecommons. rg/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo

2452-3216 © 2020 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 European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.11.004