文献类型：期刊文献

英文题名：Revealing the influences of strain amplitudes on hybrid stress-strain controlled creep-fatigue interaction responses for 9 % Cr steel

作者：Zhang, Tianyu[1,2];Wang, Xiaowei[1,2];Zhang, Chunan[1,2];Jiang, Yong[1,2];Wen, Jianfeng[3];Zhang, Xiancheng[2,3];Gong, Jianming[1,2]

机构：[1]Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Peoples R China;[2]Nanjing Tech Univ, Inst Reliabil Ctr Mfg IRcM, Nanjing 211816, Peoples R China;[3]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China

年份：2023

卷号：289

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20232614298517);WOS:【SCI-EXPANDED(收录号:WOS:001055518000001)】；

基金：The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (No. 51905261, No. 51875203) , Natural Science Foundation of Jiangsu Province (No. BK20190678) , Key Support Project of the National Natural Science Foundation of China (No. U21B2077) , National Key R & D Program of China (2022YFF0605600) and Cultivation Program for The Excellent Doctoral Dissertation of Nanjing Tech University.

语种：英文

外文关键词：Creep-fatigue interaction; Strain amplitude effect; Microstructure differences; Dwell indicator

摘要：The hybrid stress-strain controlled creep-fatigue interaction (HCFI) tests were performed on 9 % Cr steel at strain amplitudes ranging from & PLUSMN; 0.25% to & PLUSMN; 0.6%. The strain amplitude increase brings more possibilities of cracking but fewer crack deflections, along with some differences in LABs and grain size. But for HCFI tests with high creep damage, strain amplitude plays a minor role since considerable creep strain during stress holding is converted into fatigue strain even at low strain amplitudes. Additionally, a dwell indicator (DI) benchmarked against macroscopic LCF responses is proposed to evaluate strain amplitude-induced microscopic HCFI damage. When DI is approximately equal to (or greater than) 0.9, the differences in strain amplitudes can bring significant changes in internal degradation and fracture behaviors. When DI is close to (or lower than) 0.5, HCFI damage exhibits low sensitivity to strain amplitude.