Abstract
The dynamic behaviour of long straight parallel coplanar dislocations emitted from a source under a constant applied stress and a constant applied stress rate has been analysed by a few researchers. In this paper the glide motion of a dislocation group emitted from a source under a constant applied stress, the annihilation of a dislocation group under a constant applied reverse stress and the motion of a dislocation group containing a source in the absence of any applied stress were investigated. It was found that the glide motion of a dislocation group containing a source is irreversible; the interaction between dislocations in a group does not affect the average velocity of all the dislocations in the group containing a source (the average velocity is always equal to the velocity of an isolated dislocation which has been subjected to the same applied stress) and the velocity of the leading dislocation is only slightly larger than that of an isolated dislocation.
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