Accession Number : AD0739703

Title :   The Effects of Stacking Faults on Ultrasonic Surface Waves.

Descriptive Note : Technical rept.,

Corporate Author : GEORGETOWN UNIV WASHINGTON D C DEPT OF PHYSICS

Personal Author(s) : Springer,Carol E.

Report Date : APR 1972

Pagination or Media Count : 138

Abstract : A bounded ultrasonic beam in the MHz range is incident at the Rayleigh angle on a liquid-solid interface where it is double mode converted to a Rayleigh type wave and back to a longitudinal wave in the liquid. At the Rayleigh angle, and at specific frequencies, a large dip in the reflectivity curve has been found, contrary to the theory which predicts total reflection under these conditions. In an effort to explain this dip, a system of coupled equations has been derived. It is based on the pinned string dislocation model of Granato and Lucke, but includes the additional effect of stacking faults present in the solid material. (Author)

Descriptors :   (*ULTRASONIC RADIATION, METAL CRYSTALS), (*DISLOCATIONS, EQUATIONS OF MOTION), SURFACE PROPERTIES, SINGLE CRYSTALS, COPPER, THESES

Subject Categories : Acoustics
      Crystallography
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE