Acoustic metamaterial

Material designed to manipulate sound waves The artwork "Órgano" by sculptor Eusebio Sempere is large-scale example of a phononic crystal: it consists of a periodic array of cylinders in air (the metamaterial or crystal structure) and its dimensions and pattern is designed such that sound waves at a frequency of 1670 Hz are strongly attenuated. It became the first evidence for the existence of phononic band gaps in periodic structures. Part of a series onContinuum mechanics J = − D d φ d x {\displaystyle J=-D{\frac {d\varphi }{dx}}} Fick's laws of diffusion Laws Conservations Mass Momentum Energy Inequalities Clausius–Duhem (entropy) Solid mechanics Deformation Elasticity linear Plasticity Hooke's law Stress Strain Finite strain Infinitesimal strain Compatibility Bending Contact mechanics frictional Material failure theory Fracture mechanics Fluid mechanics Fluids Statics · Dynamics Archimedes' principle · Bernoulli's principle Navier–Stokes equations Poiseuille equation · Pascal's law Viscosity (Newtonian · non-Newtonian) Buoyancy · Mixing · Pressure Liquids Adhesion Capillary action Chromatography Cohesion (chemistry) Surface tension Gases Atmosphere Boyle's law Cha