Shear-wave band gaps tuned in two-dimensional phononic crystals with magnetorheological material

The shear-wave (S-wave) band structure of a two-dimensional phononic crystals (PCs) was studied. The PCs consist of lead cylinders in a magnetorheological elastomer matrix with square lattice. Numerical results showed that S-wave band gaps can be obtained and tuned as frequency-selective filters by application of an external contactless magnetic field. This magnetic field can be rotated or possesses a variable magnitude. These approaches can be potentially applied in the design of S-wave band gap-tunable devices.