316ステンレス鋼の炉水環境中での疲労き裂進展 におけるひずみ速度の影響
Influence of Strain Rate on Fatigue Crack Growth in SUS316 under Reactor Coolant Environment
著者:
能勢 昂尚 Takahisa NOSE 北田 孝典 Takanori KITADA 竹田 敏 Satoshi TAKEDA 中村 隆夫 Takao NAKAMURA 釡谷 昌幸 Masayuki KAMAYA
発刊日:
公開日:
Crack coalescenceCrack growthEnvironmental effectsFatigue crackPostulated crack growth curveStrain rate
概要
The purpose of this study is to investigate environmental effects on low cycle fatigue crack growth rate of SUS316 in different strain rate condition. The fatigue tests were conducted under different strain rate (0.4%/sec and 0.004%/sec) in simulated PWR environment with interrupting tests and the surface of specimens was observed. By the investigation of fatigue cracks growth, the effect of strain rate on crack growth rate was evaluated. From the results of tests, the followings were confirmed; ・Fatigue Life of 0.004%/sec strain rate is shorter than that of 0.4%/sec. ・The lower strain rate increases crack growth rate. ・Coalescence of crack is observed in all strain rate condition. ・The lower strain rate decreases density of crack and frequency of coalescence. ・Crack growth rate with crack coalescence influences fatigue life remarkably in low strain rate.
