An approximate model of predicting the anisotropy of high-cycle fatigue strength of composite materials

Abstract

1. We proposed a calculation-empirical model for the approximate evaluation of the anisotropy of the high-cycle fatigue strength of the CMs which takes into account simultaneously the variation of loading frequency and type of deformation. In the experimental part, the complete model requires determination of fatigue strength in respect of nonzero pulsed tensile loading and compression in the orthogonal reinforcement directions and under the angle Φ=45°, and in the simpler variant only in the preferential reinforcement direction (Φ=0°). For calculations it is necessary to obtain experimental data on the anisotropy of the limit of the short-term static strength and also long-term static strength in tension and compression in the reinforcement directions. 2. The results show that the calculated and experimental data for the woven and oriented glass fiber-reinforced plastics in pulsed tension, compression, and symmetric tension-compression in the directions Φ=15, 30, 45, and 90° are in satisfactory agreement.