Prof. Jie Yang
School of Engineering, RMIT University, Australia
Speech Title: Enhancing interfacial shear strength in metal/graphene nanocomposites via pre-strain and chemical functionalization
Due to their outstanding mechanical properties, graphene and its derivatives such as graphene nanoplatelets (GPLs) have attracted tremendous attention and are well accepted as ideal reinforcing nanofillers in developing new generation lightweight structures that are of prime importance in aerospace, automotive, marine, and defence industries. However, its reinforcing effect has been considerably affected by the poor interfacial strength between graphene and the matrix. It has been demonstrated in a series of recent studies that this challenging issue can be considerably alleviated by the use of chemically functionalized graphene fillers with mechanically induced wrinkles. By employing molecular dynamics simulations, this talk explores an effective route to improve the interfacial shear strength (ISS) of graphene sheets through the introduction of mechanically induced wrinkles formed by shear/compressive pre-strains to graphene and the chemical modification of graphene using various functional groups. The slide-out tests of a functionalized wrinkled graphene sliding over metal matrix show that such graphene sheet gives rise to larger surface roughness and better bonding which leads to stronger interfacial interactions between graphene and matrix and consequently, significant improvement in ISS. It is also found that shear induced wrinkles are much more effective in enhancing ISS than compression induced ones. Compared with its counterpart functionalized with hydrogen, graphene functionalized with alkyl (methyl, ethyl, propyl, and butyl) offers better interfacial interactions with metal matrix because these functional groups are longer than hydrogen functional group and can be embedded deeper into the matrix.
Dr. Yang is currently a full professor with the Mechanical and Automotive Engineering Discipline, School of Engineering, RMIT University, Australia. He was a Postdoctoral Research Fellow at Department of Civil Engineering, the University of Queensland from 2002-2004, a Lecturer at the Department of Building and Construction, City University of Hong Kong from 2004-2007 before joining RMIT in 2008 where he was promoted to Senior Lecturer in 2010, Associate Professor in 2014 and Professor in 2017. His main research interests include advanced composite structures, nanocomposites, structural stability and dynamics, smart structures and control, and nano/micro-mechanics. He is an author of over 300 papers including 235 SCI journal papers and 20 ESI (Essential Science Indicators) highly cited articles. His publications have so far attracted over 11950 SCI citations with SCI h-index 66 and 14570 Google Scholar citations with h-index 71. He is the Highly Cited Researcher (Cross Field) in 2019 and 2020 by Clarivate Analytics and is named Global Field Leader in Mechanical Engineering in 2020, Australia’s Research Field Leader in Mechanical Engineering in 2019 and 2020, both by Australian Research Magazine.
Prof Yang is the Associate Editor (Asian and Pacific Region) of Engineering Structures, Associate Editor of Mechanics Based Design of Structures and Machines, the editorial board member of Mechanics of Advanced Materials and Structures, Thin-Walled Structures, International Journal of Structural Stability and Dynamics, Materials, and Shock and Vibration.