Abstract
The variation of the Peierls stress and core structure of the a/2<111> screw dislocation in a body-centred cubic lattice with non-glide stresses, i.e. stresses which do not cause a Peach-Koehler force, is described. The effects observed are not insignificant; with suitable non-glide stresses, the screw dislocation can be forced into fully glissile or sessile forms. It is found that the core shape depends principally on the glide shear strain, but that the Peierls stress is dependent almost exclusively on unexpected components, termed the edge stresses, of the applied shear stress.
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