文献类型：期刊文献

英文题名：A modified damage-coupled viscoplastic constitutive model for capturing the asymmetric behavior of a nickel-based superalloy under wide creep-fatigue loadings

作者：Sun, Li[1];Liu, Li-Qiang[1];Wang, Run-Zi[1];Wang, Xiao-Wei[2];Tan, Jian-Ping[1];Guo, Su-Juan[1];Wang, Ji[1];Zhang, Ding -Wu[3];Zhang, Xian-Cheng[1,4];Tu, Shan-Tung[1,4]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[2]Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Peoples R China;[3]China United Gas Turbine Technol Co Ltd, Beijing 100016, Peoples R China;[4]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Meilong Rd 130, Shanghai 200237, Peoples R China

年份：2022

卷号：164

外文期刊名：INTERNATIONAL JOURNAL OF FATIGUE

收录：;EI(收录号：20223212535310);WOS:【SCI-EXPANDED(收录号:WOS:000875032300002)】；

基金：This work was supported financially by the National Natural Science Foundation of China (Nos. 52130511, 51725503 and 52005185) , Young Elite Scientists Sponsorship Program by CAST (YESS20200029) , and the Postdoctoral Fellowships for Research in Japan (FY2020 P20350) and the Grant-in-Aid for JSPS Fellows (21F50350) by the Japan Society for the Promotion of Science (JSPS) .

语种：英文

外文关键词：Creep-fatigue; Cyclic softening; Back stress; Deformation mechanism; Damage-coupled viscoplastic constitutive model

摘要：In this study, cyclic deformation behaviors of nickel-based GH4169 superalloy are investigated in both experimental and simulated aspects via cyclic loading waveforms (i.e., PP, CP, PC and CC) at 650 ?. Cyclic softening, stress relaxation and damage evolutions are analyzed, in which asymmetric cyclic softening in both peak/valley directions are demonstrated. The analysis of internal stress evolutions indicates that back stress is dominant and isotropic stress is secondary in cyclic softening. Afterward, a modified damage-coupled viscoplastic constitutive model is established to describe the complex cyclic behaviors as well as the damage evolutions. A term related to the first invariant of stress is incorporated into isotropic hardening rule and a softening factor introduced into the Ohno-Wang kinematic hardening rule. Additionally, a damage variable related to Young's modulus is coupled into the model, which is experimentally validated via life prediction for more abundant experimental data points. The modified model is expected to provide an in-depth insight into cyclic behaviors and fatigue life under wide loading waveforms for industrial applications.