文献类型：期刊文献

英文题名：Effect of welding joint configurations on the structural creep-fatigue behaviours under cyclic thermomechanical loading conditions

作者：Guan, Tiansheng[1];Wang, Xiaoxiao[1];Chen, Haofeng[1,2,3];Xuan, Fuzhen[1];Jia, Guodong[4]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety DOE, Shanghai 200237, Peoples R China;[2]Southwest Petr Univ, Sch Mech Engn, 8 Xindu Rd, Chengdu 610500, Peoples R China;[3]Shanghai Inst Aircraft Mech & Control, 130 Meilong Rd, Shanghai 200237, Peoples R China;[4]China Special Equipment Inspect & Res Inst, 2 Bldg, Xiyuan, Heping Rd, Beijing 100000, Peoples R China

年份：2025

卷号：218

外文期刊名：INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING

收录：;EI(收录号：20252618698507);WOS:【SCI-EXPANDED(收录号:WOS:001530683900001)】；

基金：The authors are grateful for the supports provided by the National Key Research and Development Program of China (2023YFF0614903) and the Shanghai Gaofeng Project for University Academic Program Development. The paper is also sponsored by the National Natural Sci-ence Foundation of China (52375145) , the China Postdoctoral Science Foundation (2023TQ0119, 2024M760909 and GZC20240467) , and the Shanghai Pujiang Program (No. 24PJD026) .

语种：英文

外文关键词：Welded joints; Creep-cyclic plasticity; Creep-fatigue damage; Creep-ratcheting; Linear Matching Method

摘要：Under complex thermomechanical loading, the weld zone is a critical location in Grade 91 steel high-temperature pressurised components, where the geometrical features of welded joints significantly influence the creep-fatigue interaction failure mechanisms. This study aims to investigate the effect of welding types on the creep-fatigue behaviours of pressurised structures, with two types of Grade 91 steel welded joints analysed by the extended Direct Steady Cycle Analysis (eDSCA) under the Linear Matching Method (LMM) framework, which accounts for the interaction between creep and cyclic plasticity. The results demonstrate that welding types have a significant effect on the local mechanical behaviour of the structure, primarily in different distributions and accumulations of creep strain near the heat-affected zone and fusion line. The dominant factors contributing to creep-fatigue damage are identified to reflect the failure under cyclic thermal loading and dwell periods. Furthermore, based on failure life under various loading conditions, the three-dimensional design contour plot and fitting formulas for creep-fatigue life prediction are constructed, providing new insight into the precise design and safety assessment of welded structures.