Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
EVALUATION OF INTERFACIAL FIBRE/MATRIX STRENGTH IN NATURAL HYBRID COMPOSITES
Submission Author:
Rosemere de Araujo Alves Lima , RJ , Brazil
Co-Authors:
DANIEL KIOSHI CAVALCANTI, Jorge Neto, Hector Costa, Ricardo Alexandre Amar de Aguiar, DOINA BANEA, Rosemere de Araujo Alves Lima
Presenter: Rosemere de Araujo Alves Lima
doi://10.26678/ABCM.COBEM2017.COB17-0444
Abstract
Researches related to the use of Natural Fibre Reinforced Composites (NFRC) have grown considerably in recent years, due to the current society's need to create production methods that require lower energy levels, consume products less aggressive to the environment and preferably biodegradable. Thus, numerous studies were carried out on the influence of fibre / matrix adhesion on the mechanical properties of NFRC in different types of thermoset and thermoplastic matrices. However, the researches related to natural hybrid composites are still little explored. The purpose of this study is to compare the influence of the superficial treatments of mercerization and silanization on the interfacial shear bond strength of jute, sisal and rami fibres in polymer matrices used in the production of hybrid composites (i.e. jute + sisal, jute + rami and jute + fibreglass). Pullout and short-beam tests were performed in order to evaluate the resistance to the real and apparent interfacial shear, respectively. Finally, the fracture surfaces were analysed by optical microscopy. The results of the Pullout tests presented great dispersion and the failure occurred in the fibre and not in the fibre / matrix interface. However, it was possible to determine the influence of surface chemical treatments on fibre strength. From the short beam test, the behaviour of the natural hybrid compound was evaluated for crack propagation and fibre delamination until failure. Both tests presented similar results that demonstrated the efficiency of superficial chemical treatments in improving interfacial adhesion and fibre strength, reducing the presence of voids and consequently increasing the mechanical properties of the natural hybrid compounds. In particular, the composite that presented the best result was jute + ramie silanized, followed by jute + silanized sisal while the hybrid composite jute + fibreglass presented the worst results.
Keywords
Natural hybrid composites, superficial treatments, Pull-out test, Short beam test, Jute, Sisal, Fiberglass.
