MAE Department - PG Seminar - Transformable Extremal Metamaterials: Origami-inspired Design & Broadband Elastic Wave Control

2:30pm - 3:30pm
RM 1103, HKUST (1/F, Lift # 19)

Unlike classic elastic materials which generally exhibit six orthogonal eigenmodes of deformation, extremal metamaterials can be engineered to have a number of “zero modes”, deformation modes that cost little to no elastic energy. In fact, the number of zero modes can alter the ordinary elasticity tensor from the state of null-mode (solid-state) to the states of uni-mode, bi-mode, tri-mode, quadra-mode, penta-mode and the state of hexa-mode (near-gaseous state), which brings peculiar wave control abilities, such as perfect underwater acoustic cloak and negative reflection. Here, we show an origami-inspired 3D extremal metamaterial design with reconfigurable number of zero modes, and experimentally demonstrate its transformability ranging from all seven types of extremal metamaterials. Reprogrammable elastic wave controls are further investigated in 1D-, 2D and3D-systems. Our work sheds lights on the design of flexible mechanical metamaterials, which can be potentially extended from the mechanical to the electro-magnetite, the thermal or other types.

Event Format
Speakers / Performers:
Prof. Rui ZHU
Professor at the Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, China.
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Rui Zhu is a Professor at the Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, China. He received his PhD at University of Arkansas at Little Rock (2013). He was also a Postdoctoral Fellow and later on, a Research Associate at North Carolina State University (2014), University of Missouri (2015) and University of Washington (2016). His focus of study is elastic/acoustic metamaterials and their applications in wave/vibration control. He has published over 60 peer-reviewed journal papers in Nature Communications, Science Advances, etc. Currently, he is a Fellow of the Chinese Society of Theoretical and Applied Mechanics (CSTAM) and a Fellow of the Chinese Society of Metamaterials. He has been ranked World’s Top 2% Scientists 2023 in the latest "single-recent-year-impact" metrics compiled by Stanford University.

Language
English
Recommended For
Faculty and staff
PG students
Organizer
Department of Mechanical & Aerospace Engineering
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