文献类型：期刊文献

英文题名：Fracture failure analysis of stirring shaft at geometrically continuous surface

作者：Zhong, Jiru[1,2];Chen, Shun[1];Fan, Kai[3];Guan, Kaishu[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Shanghai Inst Aircraft Mech & Control, Shanghai 200092, Peoples R China;[3]Shanghai Inst Space Prop, Shanghai 201112, Peoples R China

年份：2026

卷号：185

外文期刊名：ENGINEERING FAILURE ANALYSIS

收录：;EI(收录号：20254819584256);WOS:【SCI-EXPANDED(收录号:WOS:001630927600012)】；

基金：This project is funded by the National Natural Science Foundation of China (52105146 and 52130511) and Shanghai Gaofeng Project for University Academic Program Development.

语种：英文

外文关键词：Stirring shaft; Interference fit; Fretting fatigue; Integrated shaft-flange design

摘要：A stirring shaft was connected to a flange through an interference fit, and connection ends were joined together using a fillet weld. Fracture occurred in the shaft, initiating from its surface inside the flange rather than contact edges. Material inspections, including both chemical composition and metallographic analysis, confirmed that the shaft material complied with the required specifications. Wear marks were visible on the contact surface between the shaft and the flange. The fracture exhibited a macroscopically smooth appearance with evidence of slight ductile tearing. Beach marks and fatigue striations were observed on the macro and micro scales, respectively. The fatigue crack initiation sites at the geometrically continuous surface (i.e. inside the flange) were discussed in depth from the perspectives of fracture mechanism, numerical simulation and design. The fracture failure was attributed to fretting fatigue, caused by an improper design and fabrication of the shaft-flange connection. To prevent the occurrence of such failures, a forged shaft-flange design should be considered to enhance structural reliability.