演讲人Speaker：李腾 教授

题目Title:  RETHINK WOOD: ITS UNCONVENTIONAL APPLICATIONS IN ADVANCED MATERIAL DESIGN

时间Date：  2019 年 6 月 28 日      Time：下午4点

地点Venue： T5 栋 306 室

内容摘要Abstract：

Despite the perpetual pursuit of high performance structural materials to satisfy the ever-growing societal needs, there still lacks a low cost and environmentally sustainable solution to lightweight structural materials with exceptional mechanical properties. Here we report a facile yet effective strategy to directly transform bulk natural wood into a structural material with more than ten times increase in strength, toughness and ballistic resistance. Such a strategy involves partial removal of lignin/hemicellulose from natural wood followed by hot-pressing. The resulting densified wood yields a record high mechanical strength and fracture toughness. The intrinsic lightweightness of the densified wood delivers a specific strength higher than almost all structural metals and alloys. This strategy is shown to be universally effective for various species of woods. Super strong and tough yet lightweight wood made from a low cost and green process offers a promising solution to high performance structural materials.

个人简介(About the speaker):

Teng Li is currently the Keystone Professor in the Clark School of Engineering at the University of Maryland, College Park, where he serves as the Director of .Laboratory for Advanced Sustainable Materials and Technology. He is also an affiliated faculty of Maryland Nano Center and University of Maryland Energy Research Center. He received a Ph.D.. degree in Engineering Science from Harvard University in 2006, a M.S. degree in Materials Science from Princeton University in 2003 and a Ph.D. degree in Solid Mechanics (2001) and a B.S. degree in Engineering Mechanics (1996) from Tsinghua University. He has published 100+ journal papers, including in top journals such as Science, Nature, Nature Nanotechnology, PNAS, Physical Review Letters, Materials Today, Nature Communications, Advanced Materials, etc. Among his awards and recognitions include R&D100 Award in 2018, Invention of the Year Award (UMD) in 2018, Samuel P. Langley Distinguished Professorship by US National Institute of Aerospace in 2017, Society of Engineering Science (SES) Young Investigator Medal in 2016, US National Committee of Theoretical and Applied Mechanics Fellowship in 2012, E. Robert Kent Outstanding Teaching Award in 2012, Ralph E. Powe Jr. Faculty Award in 2007. He has been a member of the Technical Committee of Integrated Structures in ASME Applied Mechanics Division since 2006 and served as the Chair of the Committee during 2008-2012. He currently serves as the Associate Editor of Extreme Mechanics Letters and a member of the Editorial Board of International Journal of Computational Materials Science and Engineering. With Zhigang Suo, he co-founded iMechanica.org, the world’s largest online community of mechanics with tens of thousand of registered users from all over the globe.

lit@umd.edu  | http://lit.umd.edu