报告题目：RETHINK WOOD: ITS UNCONVENTIONAL APPLICATIONS IN ADVANCED MATERIAL DESIGN
报 告 人：李腾 教授 美国马里兰大学
RETHINK WOOD: ITS UNCONVENTIONAL APPLICATIONS IN ADVANCED MATERIAL DESIGN
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742 USA
firstname.lastname@example.org | http://lit.umd.edu
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.
Teng Li is currently the Keystone Professor in the Clark School of Engineering at the University of Maryland, College Park. 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 90+ journal papers, including in top journals such as Science, Nature, PNAS, Physical Review Letters, Nature Communications, Advanced Materials, etc. Six of his journal publications are Web of Science Highly Cited Papers (with enough citations to place it in the top 1% of its academic field). Among his awards and recognitions include Samuel P. Langley Distinguished Professor by US National Institute of Aerospace, 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.