Abstract
Fatigue property of FV520B-I can be affected by the changing of the loading frequency. However, few theories about fatigue property for metal at different loading frequencies has ever been proposed. Experimental data are obtained from the conducted traditional experiment (140 Hz) and ultrasonic experiment (20 kHz). Fatigue property of high strength steel FV520B-I obtained by ultrasonic high-frequency fatigue testing method is higher than that by traditional low frequency testing. FV520B-I fatigue strength conversion model are established with comprehensive use of a fitting algorithm based on the combination of experimental data and classic three-parameter-model. The fatigue strength conversion coefficient C0 for FV520B-I is proposed. A clear understand of the effect of loading frequency on the fatigue property of FV520B-I is novel and has an important significance in guaranteeing the accuracy of the actual fatigue analysis of FV520B-I.
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