A PARAMETRIC ANALYSIS OF ATTENUATION MECHANISMS IN COMPOSITES DESIGNED FOR ECHO REDUCTION

The fundamental attenuation mechanisms operating in a particular class of composites are investigated for their viability as underwater anechoic materials. The type of composites of interest consists of dense (visco-) elastic inclusions in rigid, low-density, water impedance-matched, elastic hosts.Composites similar to this have been studied by Kinra and shown to attenuate transmitted elastic waves in a resonant regime of the imbedded inclusions. Our calculations indicate that the processes given rise to the attenuation would also be appropriate for echo reduction. As a reference material, a composite material, a composite of lead-loaded silicone rubber spheres in a rigid epoxy is studied. The processes operating at both the water-epoxy and epoxy-rubber interfaces are studied theoretically.

• Supplemental Notes:
  • J. Acoustical Soc. America, 87 (1990) p.1077 (March) [28 p., 30 ref., 2 tab., 19 fig.]
• Authors:
  • Lim, R
  • Hackman, H
• Publication Date: 1990

Language

• English

Subject/Index Terms

• TRT Terms: Composite materials; Sound transmission
• Uncontrolled Terms: Underwater acoustics
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00697647
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM