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The use of composite materials has increased in the recent decades, mainly in the aeronautics and automotives industries. In the present study is elaborated a computational simulation program of the bending test using the finite elements method, in the commercial software ANSYS. This simulation has the objective of analyze the mechanical behavior in bending of two composites with polymeric matrix reinforced with carbon fibers. Also are realized bending tests of the 3 points to obtain the resistances of the materials. Data from simulation and tests are used to make a comparison between two failures criteria, Tsai-Wu and Hashin criterion.

The stress concentration appears in components that have abrupt changes in its geometry or discontinuities such as holes, etc. Because of the presence of these discontinuities occurs a increasing of the stress value. There are several studies to estimate the increase of stress in metallic materials, however, a specific literature for calculating the stress concentration in composite materials is still low, even with the increase of its use in replacement of components made of metallic materials in recent years, particularly in the aerospace and automotive industries. This study was elaborates a computer simulation program of a component with a cylindrical holy and used the finite element method for calculating the stress concentrations using the commercial software ANSYS 10.0. This simulation has the objective to analyze the structural behavior of the component.