Abstract
The speaker summarizes his recent works on the advanced metallic nanomaterials with exceptional dual mechanical properties using multiscale metallurgical structure-driven design combined with advanced mechanical simulation. The effect of surface nanostructures on the mechanical behavior and on the failure mechanism of metallic material shows the possibility to develop a new strength gradient composite. The computational models and experimental results successfully provide valuable information about the nanomaterials properties as a function nanostructure configuration (nanograins and nanotwins). The processing of nanomaterials using mechanical processing and heat treatment has been studied at nanoscale and atomic scale. With a detailed knowledge of the processing using high speed camera, we were able to accurately estimate the strain rate at different depths by analytical modeling and to study the correlation between the resulting microstructures and the strain/strain rate history of the material. The material studies using nanomechanics based experimental investigations (nanoindentation and nano-pillar tests) can reveal the effects of the atomic structure and nanostructure gradient on the mechanical behaviors. The failure mechanisms studies at nano-, micro- and macroscopic scale can provide efficient ways to enhance the ductility of materials using the general approach of strain non localization. The potential applications in aerospace industry, biomedical implants, advanced energy systems, light weight transportation systems and civil structures will be presented. The integration of nanomaterials using advanced concurrent engineering design tools with associated processing development will be introduced.
About the speaker
Prof Jian Lu received his PhD in Materials Science and Applied Mechanics from the University of Technology of Compiègne in 1986. He was Senior Research Engineer and Head of the Residual Stress and Coating Adhesion Laboratory at the French Technical Center for Mechanical Industries from 1987 to 1994, faculty of Mechanical Systems Engineering at the University of Technology of Troyes from 1994 to 2005, and faculty of Mechanical Engineering at the Hong Kong Polytechnic University from 2005 to 2010. He joined City University of Hong Kong in 2010, and is currently Chair Professor of Mechanical Engineering and Director of Centre for Advanced Structural Materials. He is also the Vice-President (Research and Technology) and Dean of Graduate Studies.
Prof Lu’s research interests include surface science and engineering, processing and mechanical properties of nanomaterials and advanced materials, experimental mechanics and residual stress. He serves and served as an editor, associate editor and member of editorial board of nine international journals. He has published 250 SCI journal papers (Science, Nature Materials, Acta Materialia, Physical Review Letters and Journal of Mechanics and Physics of Solids) with more than 5000 citations.
Prof Lu received prestigious awards including the Gold Medal with Mention in the 56th World Exhibition of Innovation and the 1st Class Prize of the Natural Science Award. He received the French Knight Order of National Merit in 2006. He is a Fellow of the National Academy of Technologies of France, the Hong Kong Academy of Engineering Sciences and the Hong Kong Institution of Science.
|
