Accession Number : ADA184271

Title :   Nonlinear Acoustics.

Descriptive Note : Final rept. 1 Dec 80-30 Jun 87,

Corporate Author : TENNESSEE UNIV KNOXVILLE DEPT OF PHYSICS

Personal Author(s) : Breazeale,M A

PDF Url : ADA184271

Report Date : 14 Aug 1987

Pagination or Media Count : 39

Abstract : The main objective was to define conditions under which nonlinear behavior of the propagating medium would be in evidence and to use quantitative evaluation of this nonlinearity to characterize the medium. This approach has taken us into the investigation of many phenomena. The description of some is adequate if one uses only the linear form of the equations. In some instances the nonlinearity was observable but could be ignored in the first approximation. In other instances the existence of nonlinearity forms the basis of the entire investigation. Keywords: Nonlinear acoustics; Finite amplitude waves; Third-order elastic constants; Solid state anharmonicity.

Descriptors :   *SOUND TRANSMISSION, *SOLID STATE PHYSICS, *ULTRASONICS, EQUATIONS, ACOUSTICS, NONLINEAR SYSTEMS, TEST AND EVALUATION, AMPLITUDE, BEHAVIOR, CONSTANTS, ELASTIC PROPERTIES, BOUNDARY LAYER, PHASE TRANSFORMATIONS

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE