Abstract
Cantilever beam type rotating fatigue test was conducted at the temperatures of room temperature, 300°C and 500°C at a frequency of 10 000 rpm, and as the check test, same type fatigue test was carried out at room temperature at the frequency of 2 450 rpm. The material used here was 0.26% carbon steel. Specimens tested were three types of different stress concentration factors; ακ=1.0, ακ=1.8 and ακ=3.0 (these values are Neuber's calculation). The following is the summarized conclusion of the experimenta1 results. In the high frequency fatigue, the sharper the notch, the more decreasing the fatigue strength; as the notch is sharper, the fatigue notch factor has larger value than that of the stress concentration factor, especially at elevated temperatures.
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