文献类型：期刊文献

英文题名：Creep-fatigue reliability assessment of nuclear structural components considering cycle number-dependent stress relaxation and its global sensitivity analysis

作者：Fu, Jin-Hui[1];Hou, Xin-Yang[1];Gong, Jian-Guo[1];Zhao, Peng[1];Xuan, Fu-Zhen[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety MOE, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2026

卷号：345

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20263321297404);Scopus(收录号：2-s2.0-105047161592);WOS:【SCI-EXPANDED(收录号:WOS:001851386500001)】；

基金：Supports from the Explorers Program of Shanghai (Basic Research Funding) (No.: 25TS1401700) and National Natural Science Foundation of China (No.: 52175139) are greatly acknowledged.

语种：英文

外文关键词：Creep-fatigue; Reliability assessment; Components at elevated temperatures; Sensitivity analysis

摘要：The creep-fatigue reliability assessment of nuclear structural components is critical to ensuring the safe operation of the system. The existing creep-fatigue design methods for structural components are mainly by the deterministic methods, while limited studies focus on the creep-fatigue reliability assessment methods of the component. Therefore, this work develops a creep-fatigue reliability assessment framework of nuclear structural components by extending the existing creep reliability assessment method and incorporating the effect of the fatigue damage. The fatigue tests of 321H stainless steel at 650 degrees C were supplemented, and the cycle number-dependent stress relaxation features of the component were considered. The global sensitivity analyses were conducted to evaluate the influence of material parameters on reliability assessment results. The results indicated that the proposed framework realizes the probabilistic assessment on creepfatigue failure of the component. The correlations of parameters in Feltham stress relaxation equation are dependent on the cycle number. The material parameters epsilon(y)f and c in Manson-Coffin equation have the largest influence on creep-fatigue life of the structural component mentioned.