报告题目：Atomic-based Cellular Automata Algorithm for the Simulation of Carbon Nanotubes
报告人：何小桥教授（香港城市大学）
报告时间：2016年6月29日（周三）下午15:00
报告地点：A18-511会议室
主办单位：国际交流合作处、科协、航空宇航学院
Abstract：Carbon nanotubes (CNTs) exhibit exceptional physical, mechanical and electrical properties which have made them potentially useful for many applications in nanotechnology, electronics, optics and other fields of materials science. As a result, progressive research activities regarding CNTs have been ongoing in recent years. Here, we examine the elastic and plastic properties of carbon nanotubes (CNTs) under axial tension and compression using the molecular dynamics (MD) simulation. In our simulations, we obtain the stress�strain responses to describe the elastic and plastic behaviors of single and multi-walled CNTs. The mechanical properties, such as Young’s modulus, Poisson’s ratio, Yield stress, ultimate stress and maximum strain, are determined and presented for armchair CNTs. Also explicit formulas are derived for the van der Waals (vdW) interaction between any two layers of a multi-walled carbon nanotube. Based on the derived formulas, an efficient algorithm is established for the buckling and vibration analysis of multi-walled CNTs, in which individual tubes are modeled as a continuum cylindrical shell. The simulation of carbon nanotubes based on the molecular mechanics (MM) and cellular automata (CA) algorithms is also carried out to investigate the buckling and post-buckling behaviours of defective CNTs using atomic based CA algorithm.
报告人简历：
Dr. Xiaoqiao He received his B.S. in Solid Mechanics from Wuhan University of Technology, M.S. in Computational Mechanics from Huazhong University of Science and Technology and PhD in Dynamics from National University of Singapore in 1982, 1988 and 1998, respectively. Prior to joining the City University of Hong Kong as a lecturer in September 2005, Dr He had four years of working experience as a Research Fellow in the joint Research Center of Institute of High Performance Computing and Nanyang Technological University in Singapore. Also, he worked as a Research Fellow in City University of Hong Kong for two years. He is currently an Associate Professor in the Department of Architecture and Civil Engineering at City University of Hong Kong. His main research areas include nanomechanics of carbon nanotubes, smart structures, computational mechanics, bistability of structures and multiscale modeling of CNT-reinforced composite.
