Theoretical and experimental study of micropolar elastic materials using acoustic waves in air

This study focuses on the development of a theoretical and experimental acoustic method setup for studying micropolar behavior materials. Two types low density closed-cell foams made from polystyrene (expanded extruded) materials that were previously reported as exhibiting non-classical elastodynamic investigated in order to reveal particular comportment using waves. different transducers employed provide large frequency band influence Cosserat parameters. The 1–40 kHz was covered tweeter loudspeaker whereas 30–120 kHz, by an air coupled ultrasonic transducer. materials’ elastic revealed through comparison between transmission coefficients. At cut-off where phase velocity transverse mode established be infinite, wave panels found very small. makes appealing harmonic noise reduction.