A hybrid composite associating natural fibers (curaua) and synthetic fibers (E-glass) was developed and investigated. The hybrid is destined for engineering applications as an alternative material to glass fiber composites, mainly in high moisture environments. Thus, an investigation was conducted to evaluate the degradation of the mechanical properties due to water absorption. The hybrid composite is formed of an orthophthalic polyester resin reinforced by layers of glass mats and continuous curaua fibers. Absorption tests were carried out and obtained the composite saturation curve for both distilled water and sea water conditions. A non-hybrid composite (just with curaua fiber), was also evaluated for comparison. The mechanical properties were evaluated through tensile and three-point-bend tests. After the mechanical tests, a fracture characteristics analysis of the tested specimens was carried out.
Rowell, R.M., Sanadi, A.R., Caulfield, D.F., Jacobson, E. and Leão, A.L. (1997). Utilization of Natural Fibers in Plastic Composites: Problems and Opportunities. In: Leão, A., Carvalho, F. X. and Frollini, E. (eds), Lignocellulosic - Plastics Composites, USP/UNESP, Brazil.
2.
Bledzki, A.K. and Gassan, J. (1999). Composites Reinforced with Cellulose Based Fibers, Progress in Polymer Science, 24(2): 221-274.
3.
Leão, A.L. , et al. (2001). Fibra de Curauá: Uma Alternativa Na Producão De Termoplasticos Reforcãdos, Plástico Industrial, 3(31): 214-229.
4.
Suddell, B.C., Evans, W.J., Isaac, D.H. and Crosky, A. (2002). A Survey into the Application of Natural Fiber Composites in the Automotive Industry. In: IV International Symposium on Natural Polymers and Composites Conference Proceedings, São Pedro, Brazil, pp. 455-461.
5.
Dahlke, B., Larbig, H., Scherzer, H.D. and Poltrock, R. (1998). Natural Fiber Reinforced Foams Based on Renewable Resources for Automotive Interior Applications, Journal of Cellular Plastics, 34: 361-379.
6.
Li, X. and Weistman, Y.J. (2004). Sea-water Effects on Foam-cored Composite Sandwich Lay-ups, Composites Part B, 35: 451-459.
7.
Davies, P., Mazeas, F. and Csari, P. (2001). Sea Water Aging of Glass Reinforced Composites: Shear Behavior and Damage Modeling, Journal of Composite Materials , 35: 1343-1371.
8.
Marcovich, N.E. , Reboredo, M.M. and Aranguren , M.I. (1998). Dependence of the Mechanical Properties of Woodflour-Polymer Composites on the Moisture Content, Journal of Applied Polymer Science , 68: 2069-2076.
9.
Adams, R.D. and Singh, M.M. (1995). The Effect of Immersion in Sea Water on the Dynamic Properties of Fiber-Reinforced Flexibilized Epoxy Composites, Composite Structures, 31: 119-127.
10.
Oliveira, W. (2005). Comportamento Mecânico e Característica da Fratura em Compositos Híbridos. Masters degree, Federal University of Rio Grande do Norte, Post-graduation Program in Mechanical Engineering , Natal-RN, Brazil.
11.
Razera, I.A.T., Trindade, W.G., Leão, A.L. and Frollini, E. (2002). Jute and Curaua Fibers as Reinforcement in Phenolic and Lignophenolic Matrix Composites. In: 4th International Symposium on Natural Polymers and Composites Conference Proceedings, São Pedro-SP, Brazil, pp. 507-514.
12.
Revista Agroamazoânia, 13th edition. In: www.revistaagroamazonia.com.br.
13.
Trindade, W.G. (2000). Preparacão de Compositos de Matriz Fenólica e Matriz Lignina-Fenol Reforcãda Com Fibras De Curauá Modificadas Superficialmente. Masters degree, The University of São Paulo, Chemistry Institute of São Carlos, São Carlos /SP, Brazil.
14.
Mothé, C.G. and Araújo, C.R. (2004). Caracterizacão Termíca e Mecânica de Compósitos de Poliuretano Com Fibras De Curauá, Polímeros: ó Ciência e Tecnologia, 14(4): 274-278.
15.
American Society for Testing and Materials D792-91: Standard Test Method for Density and Specific Gravity (Relative Density) of Plastics by Displacement, Philadelphia , CD-ROM, 1995.
16.
American Society for Testing and Materials D570-98: Standard Test Method for Water Absorption of Plastics , Philadelphia, CD-ROM, 2000.
17.
American Society for Testing and Materials D3039-00: Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials, Philadelphia, CD-ROM, 2000.
18.
American Society for Testing and Materials D790-96: Standard Test Method for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials, Philadelphia, CD-ROM, 2000.
19.
Liao, K., Shultheisz, C.R. and Hunston, D.L. (1999). Effects of Environmental Aging on the Properties of Pultruded GFRP, Composites Part A, 30: 485-493.
20.
Silva, R.V. (2003). Compósito de Resina Poliuretano Derivada de Oleo de Mamona e Fibras Vegetais. PhD Thesis, The University of São Paulo, Department of Materials, Aeronautics and Automotive Engineering , São Carlos/SP, Brazil.
21.
Scida, D., Aboura, Z. and Benzeggagh, M.L. (2002). The Effect of Ageing on the Damage Events in Woven-fiber Composite Materials Under Different Loading Conditions, Composite Science and Tecnology, 62: 551-557.
22.
Ahmed, S. and Jones, F.R. (1990). A Review of Particulate Reinforcement Theories for Polymer Composites, Journal of Material Science, 25: 4933-4942.
23.
Thwe, M.M. and Liao, K. (2002). Effects of Environmental Aging on the Mechanical Properties of Bamboo-glass Fiber Reinforced Polymer Matrix Hybrid Composites , Composites Part A, 33: 43-52.
24.
Mariatti, M. and Chum, P.K. (2005). Effect of Laminate Configuration on the Properties of Glass Fiber-reinforced Plastics (GFRPs) Mixed Composites, Journal of Reinforced Plastics and Composites , 24: 1713-1721.
