温度および応力が二段階に変動する場合の炭素鋼の疲労

概要

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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℃ many-fold multiple repeated load fatigue tests, and at 300℃ 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℃ and 500℃. In these tests, the cycle ratio at the primary temperature and stress was 40%, and the fatigue testing machine was operated at 3 000 rpm. The results of the experiment were as follows : (1) In both cases of room temperature and 300℃, 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.
社団法人日本材料学会の論文
1962-06-15