疲労試験片表面観察に基づく 微小き裂の発生・成長に与える環境効果の影響評価
Evaluations of environmental effect on micro crack initiation and propagation by surface observations of fatigue specimens
著者:
藤川 亮祐 Ryosuke FUJIKAWA 阿部 茂樹 Shigeki ABE 中村 隆夫 Takao NAKAMURA 釜谷 昌幸 Masayuki KAMAYA
発刊日:
公開日:
coCoalescence of cracksCrack growth rateCrack initiationEnvironmental effectMicro crack
概要
Fatigue life of nuclear facilities tends to be decreased by the influence of reactor coolant, which is called environmental effect. The effect accelerates crack growth rate but the influence for cra ck initiation is not clarified. This study intends to discuss the environmental effect in crack initiation. The crack length and the number of cracks are measured from the investigation of fatigue t est specimens in reactor coolant and air. The behavior of crack initiation is revealed from the measurement of number of cracks, crack sizes and fatigue life. From this study, environmental effect o f reactor coolant is considered to influence crack initiation and increase the number of micro crack. It is also estimated that the coalescence of cracks influences the acceleration of crack growth.
