Date：Nov.30,2023 (Thu.), 09:30 AM
Address：Li Zhaoji Technology Building A404
Reporter：Prof. Vincent JI
Abstract：
1.Residual stress can be generated dues to component’s fabrication, forming, machining and during their utilization. They can influence material utilisation properties and their durability. It is important to determine the level and the distribution of residual stress on mechanical components.
2.The origins of residual stress generation (mechanical deformation, thermal gradient, microstructure change) will be presented as a function of different forming and assembly process of engineering components.
3.The influence of residual stress on component’s used properties will be discussed. Different experimental methods, such as hole drilling, layer remove, section method, contour method, diffraction method (XRD, synchrotron, Neutron), ultrasonic and magnetic method, for residual stress determination will be introduced. The advantages and disadvantages of each method will be discussed.
4.The mechanism of residual stresses control, relaxation and modification will be introduced and discussed. Some industrial applications will be presented.
Introduction：Prof. Vincent Ji (嵇宁), graduated in Beihang University on 1984 (Bachelor, Mat. Sci. & Engin.), in Université Paris-Saclay on 1986 (Master deg., Metallurgy and Mat.) and in Arts et Métier ParisTech on 1989 (PhD, Mechanics & Materials). Served successively as assistant, associated professor, PhD supervisor from 1989 to 2007 in Arts et Métier ParisTech. Since 2007, full professor in Université Paris-Saclay and director of Materials department of Polytech Paris-Saclay, the Engineering school of the Université Paris-Saclay. Distinguished (Chair) Professor since 2016 and director of department of Materials, Mechanics and Energy since 2018.
The research activities of Vincent Ji aim to the fundamental mechanisms and industrial applications of alloys’ surface strengthening, surface modifications, surface coatings and surface residual stress analysis. Author and co-Author of more than 360 SCI indexed publications (H factor= 45 and more than 7000 citations); supervisor of 24 PhD students and 30 Master students; co-supervisor of 20 others (joint formation/training) PhD students.
