Dr. Julien Meaud
Georgia Institute of Technology
Seminar Information
Mechanical systems that have two or more stable equilibria (bistable and multistable systems) are attractive in a broad range of applications, such as energy absorption, wave mitigation, shape morphing, soft robotics, energy harvesting or mechanical computing. This talk will focus on a series of fundamental contributions related to the nonlinear mechanics and dynamics of such systems. I will first focus on the mechanics of metamaterials with bistable unit cells and will present experimental and numerical studies of the time- and temperature-dependent mechanics when these metamaterials are made of a thermoviscoelastic material. In the 2nd part, I will demonstrate that multistable metamaterials have tunable one-dimensional and two-dimensional elastic wave management capabilities. Finally, I will present studies of the impact dynamics of a bistable system in contact with a vibrating shaker. Both experimental and theoretical results will be shown for a single degree-of-freedom magnetic pendulum and a continuous buckled beam. A broad range of dynamical behavior, such a periodic or chaotic intrawell responses, and interwell responses, are observed.
Professor Julien Meaud is an Associate Professor in the Woodruff School of Mechanical Engineering at the Georgia Institute of Technology in Atlanta, GA. After undergraduate studies in France, he received his Ph.D. in Mechanical Engineering from the University of Michigan, Ann Arbor in 2010. His research group at Georgia Tech is funded by NSF and NIH and focuses on research in acoustics and dynamics. His two main areas of research are the nonlinear dynamics of the inner ear and the nonlinear mechanics of metamaterials and bistable systems.