Examination of the anisotropy of cyclic strength of polymer composite materials

Abstract

1. The parameter for the quantitative evaluation of the degree of anisotropy of fatigue strength of the composite materials is proposed. 2. The anisotropy of the low-cycle fatigue strength of the composite materials remains almost unchanged. Depending on the reinforcement structure, the degree of anisotropy of strength in static and cyclic loading may be identical. 3. The anisotropy of the high-cycle fatigue strength of the composite materials remains almost constant or slightly changes with an increase in the number of cycles to fracture, depending on the ratio of the fibers. The woven glass- and carbon-reinforced plastics are characterized by a large reduction in the anisotropy of high-cycle fatigue strength.