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This paper aimed to evaluate the mechanical properties in tensile testing, of polyester composites reinforced by short fibers of Munguba (Pseudobombax Munguba) and Jitó fibers (Guarea guidonia) arranged randomly. The method used was qualitative and quantitative, comparing parameters obtained in tensile mechanical tests of and appearance of the fracture for both types of composites investigated. The results showed that for the investigated composites, the tensile strength increased respectively to the length of the fibers of Munguba (10 mm 12.16 (MPa) and 15 mm -19.91 (MPa)) and from the Jitó fibers ((10 mm 18.84 (MPa) and 15 mm -.. 19.20 (MPa)) Besides, as they remained better aligned, uniform and occupying a larger contact area in the array, the tensile strength also increased. The composites reinforced by fibers of Jitó were the ones who have more satisfactory mechanical performance in tensile test for such process, with respect to manufactured by Munguba fibers.

Short fiber Munguba (Pseudobombax Munguba) and sprue (Guarea guidonia)