Accession Number : ADA138744

Title :   Effect of Pressure on the Static and Dynamic Acoustic Properties of Porous Rubber,

Corporate Author : NAVAL SURFACE WEAPONS CENTER SILVER SPRING MD

Personal Author(s) : Gaunaurd,G C ; Callen,E ; Barlow,J

PDF Url : ADA138744

Report Date : 01 Oct 1983

Pagination or Media Count : 37

Abstract : In this report we analyze the effects of pressure on the acoustic properties of porous rubbers. We consider the static and dynamic bulk moduli, the velocities of dilatational and shear waves, the characteristic wave impedances, the fundamental frequency of the monopole resonance, and the frequency dependence of the effective sound speed and attenuation. A series of figures at the end of the report shows how the (static) acoustic properties vary with pressure, and how the dynamic properties of the composite are altered by added pressures as high as 400 psi. (Author)

Descriptors :   *Numerical analysis, *Rubber, *Porous materials, *Hydrostatic pressure, *Acoustic properties, Composite materials, Dynamic response, Modulus of elasticity, Shear properties, Sound waves, Wave propagation, Velocity, Attenuation, Density, Statics, Absorbers(Materials), Underwater sound, Cavities, Distortion, Resonant frequency, Acoustic impedance, Equations, Mathematical prediction

Subject Categories : Laminates and Composite Materials
      Elastomers and Rubber
      Numerical Mathematics
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE