316FR鋼のクリープ疲労損傷累積過程に関する研究

概要

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A series of creep-fatigue tests were carried out using 316 FR steel at 650℃ in a very high vacuum environment of 0.1 μPa under loading conditions of sequential changes from creep-fatigue loading to fatigue loading and vice versa in order to examine the accumulation behavior of creep, fatigue and creep-fatigue damages with respect to a strain cycle. The linear summation of life fraction is smaller than unity in the case of creep-fatigue loading followed by subsequent creep-fatigue loading. However, the deviation from unity is not very large for this material. A sequential change between slow-fast creepfatigue loading and fatigue loading gives a summation of life ratios less than unity. On the other hand in the case of a tensile strain hold-time cycle, the summation of life ratios exceeds unity. Other tests have been conducted to simulate creep-fatigue behavior when the material is subjected to a safe shutdown earthquake (SSE). In this case the creep-fatigue life reduction is not very large.
一般社団法人日本機械学会の論文
1997-06-25