CREATION OF NOVEL STRUCTURAL MATERIALS USING GRANULAR PHONONIC CRYSTALS

摘要

Granular phononic crystals are composed of ordered elastic particles, which exhibit remarkablernversatility in their acoustic spectrum from linear to highly nonlinear regimes. In the highlyrnnonlinear regime, granular phononic crystals are capable of supporting acoustic solitons that arerncompact-supported with high energy intensity and robustness. In the linear regime, granularrnphononic crystals can operate as passive acoustic filters by leveraging the formation of acousticrnbandgaps with distinctive pass- and stop-bands. In this manuscript these unique properties ofrngranular phononic crystals are reviewed with the focus on developing tunable and lightweightrnstructures. These novel material systems will allow controlling mechanical waves in an efficientrnmanner by exploiting unique dispersion and nonlinearity effects resulting from the closerninterplay among granular particles. Such structural material systems could be used for severalrnengineering applications, including protective mechanical structures and tunable acousticrnfiltering devices.