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The use of natural materials from renewable sources has several advantages when compared with non-renewable materials. Among these, there are vegetable fibers and sisal fibers that highlight for its wide application. Natural fibers appear as an alternative reinforcement to synthetic fibers, reducing costs and showing results close to synthetic fibers. The use of fibers is still growing slowly, but is already used in internal components of popular cars, elevator aircraft and structural components of the shipbuilding industry. In this article were produced composites reinforced by sisal fibers under two conditions: in a form of chopped fiber at a random disposition, and long and aligned fibers. In the first condition, sisal fibers were chopped in a granulator mill with length varying between 5mm to 15mm and randomly arranged in the polymeric matrix. In the second condition, the sisal fibers were arranged in an orderly manner and aligned in one-way direction.

The use of composite materials reinforced with natural fibers has been widely studied in recent research seen the availability of feedstock and mainly because the productions facility, low cost and because they are biodegradable. In order to expand the applications of composite materials, this paper proposed to develop hybrid laminar composites associating natural fibers as jute, sisal and curaua in an array of type resin polyester and compare them with commercial bumpers available on the market. The sisal and curaua fibers were manually cut into lengths of 50 mm and then were arranged and incorporated separately with the polyester resin and the jute fiber cut, as a blanket in length 400 × 400 mm2 adopting for that a simple and manual manufacture process. Finally, it was executed a tensile test in hybrid laminated, and then a comparative study of tensile properties of different laminated hybrid composites, jute-sisal, jute-curaua and between the results of the commercial bumpers.

The curauá fiber, a bromeliad (Ananas erectifolius LB Smith), is considered large in the Amazon region, its mechanical properties of high strength, low density - capable of giving lightness to the final product - and potential for recycling, is listed for replace the fiberglass used as reinforcement to the plastic in the manufacture of parts with reduced features and detailed, produced by injection molding process, such as cars panel buttons, knobs and hinges. The materials used for manufacturing the polymer composites were curauá fibers acquired commercially from Belém in nature form, and a matrix of polyester resin terephthalic unsaturated and pre-accelerated chosen from one of the proportions of 0.33% (v / v), 1.66% (v / v), 3.33% (v / v) and 5% (v / v) which was initially studied. In the manufacture of the composite resin was used in combination with curauá fibers with lengths of 10 mm and a mass fraction of 3.87%, 4.87% and 5.87%.

The use of composites as engineering materials have gained more space in various sectors of human activity. For these materials enable a good synergy between the various components that constitute it, resulting in a range of properties inherent to the material more convenient than the individual components. The strengthening of these composite materials, plant fibers have advantages compared to synthetic fibers because they are abundant, are biodegradable by biological processes, renewable and recyclable. In this paper, polyester matrix composites reinforced by short bamboo fibers arranged randomly were produced, using the lowest possible level of technological processes in production stages. The matrix used was polyester terephthalic pre-accelerated with cobalt naphthenate and cured at room temperature peroxide, methyl ethyl ketone (MEK) in proportion to the resin of 0,33% by volume. The bamboo fibers used were extracted from the campus - Belém of Federal University of Pará.

The use of natural fibers in composite materials of plant origin involves environmental, social and economic factors that must be met. Moreover, there is a shortage of progressive energy and mineral resources in general. Leading the search for renewable raw materials and low cost, which has been the factor of significant importance in directing research involving the use of natural fibers in composites. The paper presents polyester matrix composites reinforced by short sisal fibers, randomly arranged in the mold without using technological stages of production. The resin used was polyester terephthalic pre-accelerated in relation curing agent/resin of 0,33% by volume. The sisal fibers were acquired in the local market of Belem of Para. The fibers were manually cut in lengths of 5, 10 and 15 mm, untreated and at room temperature. The fibers were characterized mechanical, physically and microstructurally.