Dynamics of Periodic Sandwich Beams

Sandwich beams are commonly used in vibration absorption applications due to their inherent properties. To further mitigate vibration, metamaterials with periodic properties or periodic resonators are widely incorporated as composite cores to create phonon bandgaps in sandwich beams. However, the effect of periodicity in face sheets of the sandwich beam has been sporadically explored. This paper parametrically investigates the effect of the subunit cell size and different periodicity for top and bottom face sheets on opening bandgaps that can filter transverse and longitudinal waves individually or simultaneously. Structures can be protected from both transverse and longitudinal waves using such mechanisms by enhancing the coupling effect between transverse and longitudinal modes within sandwich structure.