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The Accumulated Dissipated Energy of Composites Under Fatigue Loadings

This paper presents a method for the estimation of the vibratory fatigue strength of composite materials, which is based on the accumulated dissipated energy. The accumulated dissipated energy was measured with a special measuring technique, which is able to catch quasi-continuously the mechanical properties of the tested samples. The samples were made of glass-fiber epoxy foams, reinforced with pre-treated woven fabrics. The curves of the accumulated dissipated energy were approximated by an equation, which includes several parameters. These parameters were identified for experiments with different types of load and for samples with different contents of micropores. Samples which reach more than 10 load cycles (applied load < fatigue limit) the accumulated dissipated energy in one load stage tests was linear, for samples with fatigue load cycles < 10 the curve is nonlinear. With this function the fatigue limit of the samples can be predicted.