Pressure effects on the resonant attenuation of soft porous beads-based materials for underwater acoustics

Author:

Lacour Thomas1ORCID,Poupart Romain2ORCID,Mondain-Monval Olivier2ORCID,Aristégui Christophe1,Poncelet Olivier1,Brunet Thomas1ORCID

Affiliation:

1. Univ. Bordeaux, CNRS, Bordeaux INP, I2M, UMR 5295 1 , F-33400 Talence, France

2. Univ. Bordeaux, CNRS, CRPP, UMR 5031 2 , F-33600 Pessac, France

Abstract

Dedicated coating materials for anechoism and furtivity in underwater acoustics must exhibit a strong reliability regarding their mechanical resistance to hydrostatic pressure. Soft porous materials, especially, a distribution of soft porous beads within a polyurethane matrix, have been previously proposed as an acoustic insulator device. The purpose of the present letter is to investigate the attenuation efficiency of soft porous silicone beads-based materials while being exposed to uniaxial loads mimicking hydrostatic pressures encountered in underwater acoustics. The acoustic performance of this locally resonant material is then compared to the classical coating technology using micro-balloons. The use of an adapted surfactant (a silicone alkyl polyether compound) in the fabrication process of the soft porous silicone-based beads, obtained through an emulsion templating process, leads to particles exhibiting an open porosity. The (resonant) attenuation of the soft porous beads-based material remains greater than the micro-balloons-based material until several bars. Above this critical resilience value, the mechanical stress irreversibly damages the soft porous beads.

Funder

Direction Générale de l'Armement

Agence Nationale de la Recherche

Publisher

AIP Publishing

Subject

General Physics and Astronomy

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