文献类型：期刊文献

英文题名：Dislocation-based crystal plasticity modelling of a nickel-based superalloy under dwell-fatigue: From life prediction to residual life assessment

作者：Li, Kai-Shang[1];Wang, Run-Zi[1,2];Cheng, Lv-Yi[1];Lu, Ti-Wen[1];Zhang, Xian-Cheng[1];Tu, Shan-Tung[1];Zhang, Guo-Dong[3];Fan, Zhi-Chao[4]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[2]Tohoku Univ, Grad Sch Engn, Fracture & Reliabil Res Inst, Sendai, Miyagi 9808579, Japan;[3]Suzhou Nucl Power Res Inst, Suzhou 215004, Peoples R China;[4]Hefei Gen Machinery Res Inst Co Ltd, Hefei 230031, Peoples R China

年份：2022

卷号：159

外文期刊名：INTERNATIONAL JOURNAL OF FATIGUE

收录：;EI(收录号：20220811677846);WOS:【SCI-EXPANDED(收录号:WOS:000913126100001)】；

基金：This work was supported financially by the National Natural Science Foundation of China (Nos. 52005185, U21B2077 and 51725503), the Young Elite Scientists Sponorship Program by CAST (YESS20200029) and 111 Project. Zhang XC is grateful for the Innovation Program of Shanghai Municipal Education Commission (2019-01-07-00-02-E00068). Wang RZ and Miura H also gratefully acknowledge the supports of 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). The authors would also like to acknowledge the contributions of Professor Dong-Feng Li in crystal plasticity modelling approach.

语种：英文

外文关键词：Dwell-fatigue; Crystal plasticity; Life prediction; Residual life evaluation

摘要：In this work, a dislocation-based crystal plasticity finite element (CPFE) framework was implemented to investigate the effects of loading conditions on dwell-fatigue crack initiation life. Experimentally, a large number of strain-controlled dwell-fatigue tests were carried out at 650 degrees C in a nickel-based superalloy. The combinations of CPFE simulations and post-test examinations were used to reveal the dwell-fatigue crack initiation mechanisms. Then, a life prediction approach was presented on the basis of accumulated energy dissipation at half-life cycle. Good agreement between the experimental and simulated lives verifies the robustness as well as the accuracy of the present approach. Finally, a new three-dimensional (3-D) damage tolerance diagram was proposed by introducing a CP-based physical parameter to describe the degradation levels and evaluate the residual dwell fatigue life.