高温における金属材料の回転曲げ疲労
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概要
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One of the present authors previously carried out the rotating bending fatigue tests at elevated temperatures, using some carbon steels, and clarified the effect of test speed on the high temperature fatigue strength. However, it is necessary to investigate the behaviour of material during the fatigue by some method, in order to make clear the mechanism of the fatigue failure. Considering this point, as described in this paper, we made some rotating bending fatigue tests at room temperatures, 300℃ , and 500℃, using the low carbon steel, and simultaneously measured the deflection of test specimens during the fatigue with a specially devised apparatus, and then calculated the strain of surface layer of test specimens. Main results obtained are as follows : 1) At a room temperature, strain increases considerably at an early stage of fatigue when the stress is comparatively high, and after that, the strain is practically constant during the most period of the total life. At 300℃, the alteration of strain is small as compared with the tests at room temperature and 500℃. At 500℃, strain decreases first, then gradually increases with number of stress cycles, and before the stress and residual strain ε_p during the fatigue are plotted on a stress-strain diagram, and comparing this diagram with σ-1/N diagram obtained from the fatigue test data at respective temperature, where N is number of stress cycles to failure, we may conclude that the relation ε_pN^α=K is formed as the condition of fatigue failure, in which α and K are constant. Logarithmic plot of both residual strain ε_p and number of stress cycles to failure N indicates that α takes the value of about 0.5, and K remains near the maximum elongation in static test at room temperatures, and little influenced by the test temperature. In order to generalize the above relation, much more systematic studies will be required for various fatigue conditions, but we may say that this result is of some help towards clarification of the mechanism of fatigue failure of materials.
- 社団法人日本材料学会の論文
- 1959-11-15
著者
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