(2492)CREATION OF NOVEL STRUCTURAL MATERIALS USING GRANULAR PHONONIC CRYSTALS

摘要

Granular phononic crystals are composed of ordered elastic particles, which exhibit remarkable versatility in their acoustic spectrum from linear to highly nonlinear regimes. In the highly nonlinear regime, granular phononic crystals are capable of supporting acoustic solitons that are compact-supported with high energy intensity and robustness. In the linear regime, granular phononic crystals can operate as passive acoustic filters by leveraging the formation of acoustic bandgaps with distinctive pass- and stop-bands. In this manuscript these unique properties of granular phononic crystals are reviewed with the focus on developing tunable and lightweight structures. These novel material systems will allow controlling mechanical waves in an efficient manner by exploiting unique dispersion and nonlinearity effects resulting from the close interplay among granular particles. Such structural material systems could be used for several engineering applications, including protective mechanical structures and tunable acoustic filtering devices.