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Characteristics of Waves in Media with Periodic Resonant Microstructures

Hsin-Haou Huang (National Taiwan University)

Mechanics and Dynamics of Periodic Structures

Wed 9:00 - 10:30

Salomon 101

Acoustic/Elastic metamaterials are media possessing exceptional elastic material properties not commonly found in natural materials. These material properties are enacted, not due to chemical composition, but by structurally designed man-made microstructures. With artificially designed microstructures utilizing resonance effect, the media can possess frequency-dependent, as well as tunable material properties. In the present study, we investigate the dynamics characteristics of a medium with periodic resonant microstructures. By employing different types of microstructures, the medium is capable of exhibiting effective negative mass density, or effective negative elastic modulus, or both. Wave propagation in such medium is studied based on the plane-wave assumption. Reflection, refraction, and transmission of the harmonic wave are determined using the proposed effective continuum model. In addition, interesting transient wave motion is presented through numerical simulations based on simplified discrete element model. The dynamic characteristics and applications of unusual wave motion are investigated and discussed.