报告人： 卢国兴 教授（Swinburne University of Technology）
报告题目：Impact and Energy Absorption of Origami Structures and Metamaterials
邀 请 人： 孙博华教授 南非科学院院士、力学技术研究院院长和首席科学家
Professor Guoxing Lu obtained his PhD in 1989 from the University of Cambridge, supervised by Professor CR Calladine (FRS, FREng). After one year post-doctoral research at Cambridge, he worked as a faculty member at Nanyang Technological University, Singapore, and presently is Professor of Impact Engineering at Swinburne University of Technology, Melbourne, Australia. His research interests are energy absorption of structures and materials, mechanical properties of materials at high strain rates, impact mechanics and most recently origami structures. He has over 260 publications in international journals and one monograph co-authored with Professor Tongxi (TX) Yu, Energy Absorption of Structures and Materials, Elsevier, 2003. He has11300 citations with an H-index of 56. He is an Associate Editor of International Journal of Impact Engineering and a member of editorial board of International Journal of Mechanical Sciences, Thin-Walled Structures, Composites B and others. He is President of International Society of Impact Engineering. He is Associate Dean Research, School of Engineering.
This presentation introduces energy absorption and impact response of origami inspired structures and metamaterial, which we have recently studied. Several examples of incorporating the concepts of origami will be presented. They include thin-walled structures under axial loading, Miura metamaterials and its variations under quasi-static and dynamic compression and origami sandwich panels under quasi-static loading and ballistic impact.
Responses of such materials and structures involve large plastic deformation as well as dynamic effects. For metamaterials, analytical models have been developed to describe the strength and energy absorption capacity. It is assumed that the base material is ductile and can be approximated as a perfectly-plastic material. The analytical model is verified by the numerical simulations as well as quasi-static compression test of a four-sheet origami specimen. Response of such material under impact loading is also investigated and a shock model is proposed for high velocity impact.