Accession Number : AD0691058

Title :   ON THE RADIATION OF ELASTIC ENERGY FROM NON-UNIFORMLY MOVING DISLOCATIONS,

Corporate Author : BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH SOLID STATE PHYSICS LAB

Personal Author(s) : Gruner,Peter

Report Date : JAN 1969

Pagination or Media Count : 41

Abstract : The rate of energy radiated from a dislocation which is, on its path through the lattice, alternately accelerated and decelerated on account of external and internal stresses can be several orders of magnitude higher than the power emitted from a dislocation which vibrates around its equilibrium position. A periodically accelerating dislocation radiates, in general, not only the fundamental frequency, which is determined by the average velocity of the dislocation and the distance between obstacles, but also higher harmonics. The stress required to compensate for the energy loss is, for dislocation velocities which are well below the sound velocity, proportional to the second power of the velocity amplitude and independent of the average velocity. (Author)

Descriptors :   (*DISLOCATIONS, WAVE PROPAGATION), MECHANICAL WAVES, CRYSTAL LATTICES, STRESSES, ACCELERATION, DEFORMATION

Subject Categories : Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE