WALTER LACARBONARA

Sapienza University of Rome

Italy

A multi-band gap metamaterial with multi-frequency resonators

The main focus of this talk is on high-performance 1D and 2D metamaterials featuring a periodic distribution of highly tunable infinite-dimensional resonators. The embedded resonators are first treated as linear systems exhibiting eigenspectra with distinct features while the dispersion curves of the metamaterials show single or multiple band gaps across which no wave propagation occurs. The stop-bands sensitivity with respect to the design parameters is discussed. These resonators are then enriched by nonlinearities. The nonlinear wavefrequencies and waveforms away from internal resonances obtained via a perturbation approach are shown to exhibit a high nonlinear tunability which is a key for advanced applications. Various 3D printed metamaterial samples are tested experimentally using a 3D laser scanning vibrometer system to show very interesting wave propagation properties.

Short bio

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, former 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 co-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), 24 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.