The results of tensile test samples of composite material based on epoxy resin content of carbon fabric, including the cyclic change of stress until the destruction of the sample. Defines the limits of strength, the effective elastic modulus, hysteresis loss. It was shown that the dependence of the module against mechanical stresses determined by the matrix, whereas the numerical value of the strength characteristics mostly depend on the filler. Mechanical cycling leads to a stabilization of the deformation characteristics of the material.