Accession Number : AD0676904

Title :   WAVE PROPAGATION IN VISCOELASTIC MEDIA.

Descriptive Note : Final rept.,

Corporate Author : OKLAHOMA STATE UNIV STILLWATER RESEARCH FOUNDATION

Personal Author(s) : Thurston,George B.

Report Date : AUG 1968

Pagination or Media Count : 7

Abstract : Studies have been made of wave propagation in both viscoelastic solids and viscoelastic liquids. Both theoretical and experimental wirk have been carried out and goals have been concerned with macroscopic wave propagation phenomena as well as interpretation of these phenomena on a microscopic basis. It has been sought to evaluate acoustic properties of materials from the viewpoint of viscoelasticity and to explore experiments for determining these properties as well as to evaluate the theoretical utility of such information. Wave propagation across interfaces, through layers, and transmission through plates have been considered. Work has been done on the propagation of flexural waves in metal plates and plastic plates. Shear wave propagation in viscoelastic liquids has been studied by utilizing optical birefringence associated with this propagation. Shear wave velocity and attenuation have been determined and reflected and interference effects studied. The influence of suspended macromolecules and solid particles on viscoelasticity and birefringence of liquids has been determined and has been related to shear wave propagation effects both in theory and in measurements. Polymer additives which are important in drag reduction (Toms effect) have been studied by shear wave techniques. (Author)

Descriptors :   (*VISCOELASTICITY, *SOUND TRANSMISSION), (*MECHANICAL WAVES, VISCOELASTICITY), SOUND, SOUND TRANSMISSION, BIREFRINGENCE, INTERFACES, METAL PLATES, SHEAR STRESSES, VELOCITY, ATTENUATION, REFLECTION, INTERFERENCE, ADDITIVES, POLYMERS, HYDRODYNAMICS, MICROPHONES

Subject Categories : Acoustics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE