摘要
在620℃下对P91钢进行了蠕变-疲劳裂纹扩展试验,研究了全循环周期对裂纹起裂时间的影响,并讨论了不同保载时间下的裂纹扩展规律。结果表明:在单对数坐标下裂纹起裂时间与全循环周期呈线性关系;当全循环周期小于20 s时,裂纹起裂循环次数不随全循环周期变化;采用断裂参量ΔK表征裂纹扩展速率时,裂纹扩展速率随保载时间的增加而增大,但随ΔK的增大先减小后增大;断裂参量(Ct)avg可较好地关联不同保载时间的平均裂纹扩展速率。
Creep-fatigue crack growth tests were carried out at 620 ℃ to study the effects of total cycle period on the crack initiation time, and to analyze the crack growth behavior under various time durations. Results show that in a single-logarithm coordinate, the crack initiation time shows a linear relationship with the total cycle period. When the total cycle period is less than 20 s, the number of cycles for crack initiation does not change with the total cycle period. When the crack growth rate characterized by ΔK, the crack growth rate increases with the rise of hold time, but decreases first and then increases with the rise of ΔK, while that characterized by(Ct)avg can correlate well the crack growth rates under different time durations.
作者
刘长军
闫阿晨
谈建平
秦敬芳
张静
王东辉
LIU Changjun;YAN Achen;TAN Jianping;QIN Jingfang;ZHANG Jing;WANG Donghui(School of Mechanical and Power Engineering,Ministry of Education,Key Laboratory of Pressure Systems and Safety,East China University of Science and Technology,Shanghai 200237,China;State Nuclear Power Plant Service Company,Shanghai 200233,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2019年第11期947-952,共6页
Journal of Chinese Society of Power Engineering
基金
国家重点研发计划资助项目(2018YFC0808800)
国家自然科学基金资助项目(11502082)
