THE MOTION OF A DISLOCATION, ACTED ON BY A VISCOUS DRAG, THROUGH AN ARRAY OF DISCRETE OBSTACLES.

摘要

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)