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Consider a straight screw dislocation parallel to a rigid surface, constrained not to deform. Show that...

Consider a straight screw dislocation parallel to a rigid surface, constrained not to deform. Show that the screw is repelled from the surface by a force equivalent to an image dislocation of the same sign and magnitude. (This example is relevant to the situation of a dislocation near a surface with a hard oxide layer upon it.)

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