Three-dimensional adaptive soft phononic crystals

Articles you may be interested in Finite element analysis and experimental study of surface acoustic wave propagation through two-dimensional pillar-based surface phononic crystal Influences of gradient profile on the band gap of two-dimensional phononic crystal Formation of longitudinal wave band structures in one-dimensional phononic crystals Dynamics of elastic waves in two-dimensional phononic crystals with chaotic defect Appl. We report a new class of three-dimensional (3D) adaptive phononic crystals whose dynamic response is controlled by mechanical deformation. Using finite element analysis, we demonstrate that the bandgaps of the proposed 3D structure can be fully tuned by the externally applied deformation. In fact, our numerical results indicate that the system acts as a reversible phononic switch: a moderate level of applied strain (i.e., À0.16) is sufficient to completely suppress the bandgap, and upon the release of applied strain, the deformed structure recovers its original shape, which can operate with a sizable bandgap under dynamic loading. In addition, we investigate how material damping significantly affects the propagation of elastic waves in the proposed 3D soft phononic crystal. We believe that our results pave the way for the design of a new class of soft, adaptive, and re-configurable 3D phononic crystals, whose bandgaps can be easily tuned and switched on/off by controlling the applied deformation. V C 2015 AIP Publishing LLC.