高温における低炭素鋼の動クリープおよび破断に関する研究

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Dynamic creep and rupture tests were carried out with annealed specimens of a 0.15 percentcarbon steel under the combined static and alternating stress of stress ratios (alternating stress/mean stress) more than unity. The test temperature was 450℃. The results of the present study together with those obtained in the previous study for the stress ratios less than unity were analysed in a view of the author's theory, which aims to relate the strength under dynamic stress to the static creep strength. The conclusion obtained is summarized as follows : 1. The forms of the dynamic creep curves were similar to those of the static creep curves even for the case of the stress ratio more than unity. 2. The prediction of dynamic creep rupture strength from the static creep rupture data together with the fatigue data under reversed stress was established over the entire range of stress ratio from zero (static stress) to infinity (reversed stress). This is based on the idea that the damages of material under varying stress are composed of the creep damage previously discussed and the fatigue damage caused by the dislocation oscillation under alternating stress. 3. The equivalent static stress, which was defined previously to predict the dynamic creep strength from the static creep data in the stage of transient creep, is applicable to the case of creep including the steady state component in addition to the transient component and also to the case of rupture. 4. The influence of the dislocation oscillation under alternating stress on the dynamic creep was also discuseed
一般社団法人日本機械学会の論文
1960-07-25

高温における低炭素鋼の動クリープおよび破断に関する研究

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