S0306-4-5 微少試験片による原子力材料の疲労寿命と微少き裂成長挙動の評価([S0306-4]疲労およびクリープ疲労寿命評価)

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  • S0306-4-5 Evaluation of Fatigue Life and Micro Crack Growth Behavior of Nuclear Plant Materials using Miniature Specimen

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The effect of specimen size and specimen shape on the low cycle fatigue life and the micro crack growth behavior under low cycle fatigue in the reduced activation ferritic/martensitic steel, F82H, were investigated using a miniature specimen to develop the fatigue life evaluation method using it. The effect of specimen size on the fatigue life from 10^3 to 10^4 cycles level was almost negligible for the round-bar specimens. While, the effect of specimen shape was clearly observed in the hourglass specimen. The shorter fatigue life at relatively low strain range and slight longer fatigue life at relatively high strain range than the standard specimen were observed. The micro crack growth behavior of the miniature hourglass specimen in F82H was similar to that of the standard specimen observed in the various metals.

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