讲座题目：Sustainability and Durability of Construction Materials: From Nano to Macro Scales

讲座时间：6月9日下午4点半

讲座地点：7号楼二楼大报告厅

欢迎广大师生参加，刘博士还将介绍香港城市大学土木工程专业情况，有意向去香港城市大学深造的同学可前往咨询。

                                                   土木与交通学院

                                                    2015年6月1日

摘要：“Bonded material systems are found in various engineering applications ranging from nanoscale components, such as thin films in circuit boards, to macroscale structures, such as adhesive bonding in aerospace and civil infrastructure. The long term structural integrity of a bonded material system is mainly controlled by the interface.Through a local investigation in mechanics around the interfacial region, a global sense in sustainability and durability of materials can be achieved.Prior research studies in this area have indicated that moisture-induced debonding is a complex phenomenon that may often involve a distinctive dry-to-wet debonding mode shift from the bulk material decohesion to the interface separation.Such premature failures may occur regardless of the durability of the individual constituent materials forming the material systems and further explanation at a more fundamental length scale is necessary. In this presentation, the molecular dynamics (MD) simulation technique will be discussed in the context of structural mechanics applications, providing a fundamental understanding of the atomistic approach, and demonstrating its applicability to a larger system using an appropriate multiscale model.The epoxy-silica system, which can be found readily in buildings and bridges, is used as an example.The prediction from the multiscale model shows a good agreement with the experimental data of the interfacial fracture toughness and the associated morphology of material captured under the scanned electronic microscope (SEM). The method used here provides a new approach to link nano to macro for complex material systems.”

主讲人简历：

“Denvid obtained his Bachelor degree with first class honors and Master degree in Civil Engineering from the University of Hong Kong in 2004 and 2006 respectively, and got his second Master degree from the Department of Civil and Environmental Engineering (CEE) at Massachusetts Institute of Technology (MIT) in 2009. He then received his Ph.D. in the field of structures and materials from MIT in 2012.Prior to joining the City University of Hong Kong as an assistant professor in August 2012, he worked as a postdoctoral associate at MIT.Denvid got various awards and scholarships including the Croucher Foundation Scholarship and the Marvin E. Goody Award from MIT.He was named as one of the Harvey Fellows in 2011.His research focuses on the multiscale modeling of organic-inorganic system, wood mechanics, moisture-induced debonding, durability of concrete-epoxy system and fiber-reinforced polymer (FRP) composites in structural rehabilitation.”