Accession Number : AD0704520
Title : THE MOTION OF A DISLOCATION, ACTED ON BY A VISCOUS DRAG, THROUGH AN ARRAY OF DISCRETE OBSTACLES.
Descriptive Note : Technical rept.,
Corporate Author : HARVARD UNIV CAMBRIDGE MASS DIV OF ENGINEERING AND APPLIED PHYSICS
Personal Author(s) : Frost,H. J. ; Ashby,M. F.
Report Date : MAR 1970
Pagination or Media Count : 28
Abstract : A computer model was used to calculate the shape and average velocity of a dislocation acted on by a viscous drag, and moving through a field of point obstacles. As a special case, the operation of a Frank-Read source was computed also. At sufficiently low velocities (and stress levels) the behavior is governed entirely by the obstacle spacing and strength; conventional tensile probably falls in this regime. At sufficiently high velocities (and stress levels) the behavior is governed entirely by the viscous drag; explosive deformation falls in this regime. In between lies a wide range in which the two effects superimpose, each contributing measurably to the flow stress. (Author)
Descriptors : (*RHEOLOGY, DISLOCATIONS), DRAG, MOTION, VELOCITY, STRESSES, DEFORMATION, EXPLOSION EFFECTS, DISPERSION HARDENING
Subject Categories : Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE