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58 results on '"Rahier, Hubert"'

7. Reaction kinetics and rheological behaviour of meta-halloysite based geopolymer cured at room temperature: Effect of thermal activation on physicochemical and microstructural properties

Author

Kaze, Cyriaque Rodrigue, primary, Alomayri, Thamer, additional, Hasan, Assaedi, additional, Tome, Sylvain, additional, Lecomte-Nana, Gisèle Laure, additional, Nemaleu, Juvenal Giogetti Deutou, additional, Tchakoute, Herve Kouamo, additional, Kamseu, Elie, additional, Melo, Uphie Chinje, additional, and Rahier, Hubert, additional

Published
2020
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19. Electrospun nanofibrous interleaves for improved low velocity impact resistance of glass fibre reinforced composite laminates

Author

Daelemans, Lode, primary, Cohades, Amaël, additional, Meireman, Timo, additional, Beckx, Jasper, additional, Spronk, Siebe, additional, Kersemans, Mathias, additional, De Baere, Ives, additional, Rahier, Hubert, additional, Michaud, Véronique, additional, Van Paepegem, Wim, additional, and De Clerck, Karen, additional

Published
2018
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20. Novel composite materials with tunable delamination resistance using functionalizable electrospun SBS fibers

Author

van der Heijden, Sam, Daelemans, Lode, De Bruycker, Kevin, Simal, Robin, De Baere, Ives, Van Paepegem, Wim, Rahier, Hubert, De Clerck, Karen, van der Heijden, Sam, Daelemans, Lode, De Bruycker, Kevin, Simal, Robin, De Baere, Ives, Van Paepegem, Wim, Rahier, Hubert, and De Clerck, Karen

Abstract

Electrospun fibers have shown great potential for the interlaminar toughening. In this work, electrospun SBS fibers were incorporated into glass epoxy laminates. The mechanical properties of these SBS fibers are tuned using a triazolinedione cross-linker, where a higher amount of cross-linking gives rise to a lower elongation at break and a higher stiffness of the SBS fibers. Consequently, insights are provided into the relation between mechanical properties of electrospun fibers and enhancements in both Mode I and Mode II interlaminar fracture toughness. The SBS fiber’s mechanical properties affect the crack path in composites. Non and low cross-linked SBS fibers which have a very low stiffness promote crack growth with SBS fiber bridging under both Mode I and Mode II loading conditions. However, these SBS fibers need to elongate substantially in order to take up a significant amount energy (>300%). As this only occurs under Mode I loading conditions, the Mode I interlaminar fracture toughness can be improved. Nevertheless, the Mode II IFT is negatively affected. Higher cross-linked SBS fibers on the other hand, do take up more energy at much lower levels of elongation. As such, they can improve the Mode II interlaminar fracture toughness substantially.

Published
2017

25. Interlaminar toughening of resin transfer moulded glass fibre epoxy laminates by polycaprolactone electrospun nanofibres

Author

Rahier, Hubert and Physical Chemistry and Polymer Science

Subjects
Toughening, nanofibers, mode I, epoxy
Abstract

Delamination and brittle matrix fracture has since long been a problem of fibre reinforced composites. This paper investigates if polycaprolactone (PCL) nanofibre nonwovens can increase the interlaminar fracture toughness of resin transfer moulded glass fibre/epoxy laminates, without causing problems during impregnation and without negatively affecting other (mechanical) properties. The mode I fracture toughness was shown to be dependent on both the nanofibre content as well as on how the nanofibres were introduced into the laminates. Almost 100% improvement in fracture toughness could be achieved by electrospinning the PCL nanofibres on both sides of the glass fibre mats prior to impregnation. This led to a model fracture toughness of over 1200 J/m(2). Tensile and dynamic mechanical properties of the toughened laminates were not affected by the PCL nanofibres. It could be concluded that even state of the art infusion resins with a high intrinsic fracture toughness can benefit significantly from nanofibre toughening.

Published
2014

33. Development of Optimized Autonomous Self-Healing Systems for Epoxy Materials Based on Maleimide Chemistry Polymer

Author

Billiet, Stijn, Van Camp, W., Hillewaere, Xander, Rahier, Hubert, Du Prez, Filip, and Physical Chemistry and Polymer Science

Subjects
self healing, thiol, maleimide
Abstract

Maleimide chemistry involving amines and thiols is presented and evaluated for the design of autonomous self-healing epoxy materials. Model reactions show that amines react rapidly with maleimide compounds at room temperature via the Michael addition reaction. Moreover, thiols and maleimides react readily in the presence of a tertiary amines that are present in the epoxy material. The maleimide conjugation reaction with residual amines in the epoxy material ensures chemical bonding of the newly formed network with the original materials during crack healing, while in the crack plane, multifunctional thiols react with difunctional maleimides to fill the crack area. Healing efficiencies are evaluated using the tapered double cantilever beam (TDCB) test method with manual injection of the healing agents, revealing a maximum healing efficiency up to 121 % for EPON 828 epoxy material. Furthermore, the use of maleimide chemistry has also been evaluated for self-healing applications towards a cold-curing resin that is currently used for infusion of wind turbine blades (RIM resin). While the healing efficiency is strongly dependent on the type of epoxy material, the average maximum peak load for fracture after healing is roughly the same for all tested epoxy materials.

Published
2012

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