Fatigue Life of Carbon Steel under Varying Temperature and Stress Amplitude in Two Levels

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We carried out rotatory bending fatigue tests on smoothed specimens of 0.26% carbon steel. Describing in details, at room temperature and 300°C many-fold multiple repeated load fatigue tests, and at 300°C double repeated load fatigue tests were made in two stress levels. The fatigue tests under varying temperature and stress amplitude in two conditions were also conducted at room temperature, 300°C and 500°C. In these tests, the cycle ratio at the primary temperature and stress was 40%, and the fatigue testing machine was operated at 3000rpm. The results of the experiment were as follows:(1) In both cases of room temperature and 300°C, the cumulative cycle ratios in the many-fold multiple repeated load fatigue tests in two stress levels are 0.7-0.8 as for this material.(2) When the fatigue life at the primary temperature and stress in larger than that at the secondary temperature and stress, the cumulative cycle ratio Σn/N is larger than 1. When the fatigue life at the primary stage is smaller than that at the secondary stage, the value of Σn/N is smaller than 1.
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