"Propriedades mecânicas de compósitos de matriz poliéster reforçados por tecidos híbridos juta/vidro".

Abstract

In this work the mechanical properties of unsaturated polyester composites reinforced by a hybrid jute/glass woven cloth were determined as a function of fiber content and cloth orientation. The hybrid cloth had jute fibers (44 wt%) on the warp and glass fibers (56 wt%) on the weft directions. Composites reinforced by up to 6 layers of hybrid cloth were produced and their mechanical properties determined as a function of fiber content and orientation. The composites were tested along the warp (jute) and the weft (glass) directions. Composites having 2, 4 and 6 layers of hybrid cloth disposed in 0/90° stacking sequences were also produced and their tensile properties were determined as a function of fiber content. The mechanical properties of unsaturated polyester composites reinforced by up to 6 layers of glass cloths were also determined. As expected, the results showed that the mechanical properties of every composite under investigation increased with the overall fiber content. Composites reinforced by hybrid cloths, when tested along the glass direction, showed higher mechanical properties than when tested along the jute fiber direction which was attributed to the properties of the individual components of the cloth and also to the fact that the jute fibers were on the warp direction. The composites reinforced by hybrid cloths disposed in 0/90° stacking sequences exhibited intermediate properties when compared with equivalent composites tested along the glass or the jute fiber directions. Higher overall mechanical properties were obtained for the composites reinforced by the glass fiber cloths.