304 力学的な予損傷を与えられた CrMoV 鋼におけるクリープ, 疲労き裂進展速度

概要

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The effect of mechanical degradation in a long-term-operated component on the creep-and fatigue-crack growth rates was studied. Creep-crack-growth tests and fatigue-crack growth tests were performed on creep-pre-strained and cyclic-strained CrMoV rotor-steel specimens. It was found that under constant load, creep-crack growth rates, da/dt, of the creep-pre-damaged specimens were higher than those of virgin specimens. Another result showed that fatigue-crack growth rates, da/dn, of fatigue-pre-damaged specimens were higher than those of virgin specimens. The results suggest that the creep remaining lives and fatigue remaining lives of the mechanically damaged CrMoV rotor steel can be estimated by using C^*&ΔJ of the damaged material and the da/dt and da/dn values of the virgin material.
社団法人日本機械学会の論文
2003-09-19