オーステナイト系ステンレス鋼の 等二軸応力下における疲労き裂進展挙動に関する検討
Study on the Behavior of Fatigue Crack Growth of Austenitic Stainless Steel under Equi-biaxial Stress
著者:
飯田 智 Satoshi IIDA 北田 孝典 Takanori KITADA 中村 隆夫 Takao NAKAMURA 釜谷 昌幸 Masayuki KAMAYA
発刊日:
公開日:
equi-biaxialfatigue lifepressurized disc fatigue teststrain intensity factorstrain range
概要
To prevent degradation at Nuclear Power Plants (NPPs) by maintenance activity, fatigue evaluation should be improved to be more accurate. Studies of crack growth under equi-biaxial fatigue which is caused by thermal stress have been conducted for these purposes. Previous study shows that crack growth rate under equi-biaxial stress is faster than under uniaxial one. But the comparison is not quantitative. In this study, the difference of crack growth rate between equi-biaxial and uniaxial is confirmed quantitatively using strain intensity factor. The study focused on the relationship between crack growth rates and the values of strain range under equi-biaxial and uniaxial. There is possible to be a correlation between crack growth rate and the value of strain range under equi-biaxial and uniaxial.
