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THE DISLOCATION PLASTICITY IN THE TIP OF SELF-HEALED CRACKS
The plastic flow in the tip of a stopped crack in the LiF single crystal is investigated by numerical modeling. The two stages of dislocation structure formation in the tip of crack are discussed. The first stage is the formation of gliding lines in the moment of crack stop. The second one is their evolution and partial crack healing. The situation and quantity of dislocations in gliding line according to both loading effort and stress of friction are determined. It is shown, that under the condition of unloading a few dislocations more out of crystal on the crack plane under affect of mutual repel and forces of reflection. As a result of the process, the dislocation density is maximal at some distance from the crack tip. There is a dislocation free area near the crack tip
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