7 Impurity pinning

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The yellow atom is a small impurity in the blue layer. It's neighbors have relaxed in towards it. A dislocation is off to its left. Apply a shear stress of 0.05, run, and see what happens. Vary both the magnitude and the sign of the stress. What stress is required to pull the dislocation away from the impurity?

Add another impurity or two some distance roughly above and below the first by clicking on the blue atoms. Grab the shear stress handle and move the dislocation around to see what happens.