Pentamode Metamaterials - Metafluids For Transformation Acoustics
Wednesday, May 9, 2012 - 05:40
in Physics & Chemistry
Pentamodes, proposed in 1995 by Graeme Milton and Andrej Cherkaev, have been purely theoretical but three-dimensional transformation acoustics ideas, for example inaudibility cloaks, acoustic prisms or new loudspeakers, could become reality in the near future.The mechanical behavior of materials like water (or even gold) is expressed in terms of compression and shear parameters. For examples, water as an incompressible fluid that can barely be compressed in a cylinder is described through the compression parameter, but that it can be stirred in all directions using a spoon is expressed through the shear parameters. read more