Abstract
The stress field of an edge dislocation near a finite length crack depends on where the dislocation is originated. If the dislocation is emitted from the crack which is originally stress-free, the image force increases with decreasing crack length. But the opposite is true if the dislocation is originated from elsewhere. At the same distance from the crack tip, the image force for the former is always larger than that for the latter. They become equal only if the crack is semi-infinitely long. If the dislocation is emitted from one of the crack tips, it generally will shield this crack tip but antishield the other tip. However the dislocation will shield or antishield both crack tips if it is originated from elsewhere.
Published Version
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