Session: 06-06: Bioinspired Structures

Paper Number: 111231

111231 - Spider-Web-Inspired Metamaterial Design and Experimental Validation 

A 2D metamaterial cellular system inspired by lightweight honeycombs and spider webs is proposed. The hexagonal cells of the honeycomb act as hosting structures for spider-web-like or cantilever resonators with added lumped masses which can, in principle, vibrate in infinitely many modes. Contrary to conventional approaches utilizing discrete mass-spring resonators here the infinite-dimensional (full spectrum) resonators are intentionally tailored to generate multiple complete or incomplete stop bands across which wave propagation is either totally or partially suppressed along preferential directions. The projection method combined with the Floquet-Block theorem assuming a quasi-periodic space-wise solution is employed to obtain the dispersion curves and the bandgap sensitivity with respect to the design parameters. In particular, it is shown that the resonators nonlinearity can enhance the band gaps size and distribution. A novel additive manufacturing fabrication process is proposed to realize the metamaterial sample which combines 3D printing with electrospinning. Experimental results based on laser scanning vibrometry show the operational deflection shapes under a chirp excitation spanning a broad frequency range. The results corroborate the theoretical predictions and confirm the robustness of the stop band behavior with a wealth of results leading to a closer understanding of these formidable stop band cellular material systems.

Presenting Author: Walter Lacarbonara Sapienza University of Rome

Presenting Author Biography: Walter Lacarbonara is a Professor of Nonlinear Dynamics at Sapienza University and Director of the Sapienza Center for Dynamics. During his graduate education he was awarded a MS in Structural Engineering (Sapienza University) and a MS in Engineering Mechanics (Virginia Tech, USA), and a PhD in Structural Engineering (Sapienza/Virginia Tech). His research interests cover nonlinear structural dynamics; dissipation in carbon nanotube/polymer nanocomposites; asymptotic techniques; nonlinear control of vibrations; experimental nonlinear dynamics; dynamic stability of structures. He is Editor-in-Chief of Nonlinear Dynamics (Springer Nature), Associate Editor for International Journal of Aeronautical & Space Sciences; he also served as Associate Editor for ASME Journal of Applied Mechanics, Journal of Vibration and Acoustics, Journal of Sound and Vibration. He served as Chair of the ASME Technical Committee on Multibody System and Nonlinear Dynamics, General Chair and Technical Program co-Chair of the ASME 2015 (Boston, USA) and 2013 (Portland, USA) IDETC Conferences. He has organized over 10 international symposia/conference sessions and, very recently, the First, Second, and Third International Nonlinear Dynamics Conferences (NODYCON, www.nodycon.org/2019, www.nodycon.org/2021, www.nodycon.org/2023).
His research is supported by national and international sources (EOARD/AFOSR, NSF, European Commission, Italian Ministry of Science and Education). He has published over 250 papers and conference proceedings, 4 international patents (EU/USA/China), 28 book chapters, 6 co-edited Springer books and a single-authored book (Nonlinear Structural Mechanics, Springer, NY, https://link.springer.com/book/10.1007/978-1-4419-1276-3) for which he received the 2013 Texty Award nomination by Springer US.