1 Perfect crystal

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You are looking down on the slip plane of a perfect crystal. The red atoms are in the plane immediately below the slip plane and are rigidly fixed; the blue atoms are immediately above and are elastically coupled to each other. You can apply a shear stress across the interface by applying a force on the upper half of the crystal (i.e., the blue atoms) with respect to the lower, using the slider below the display. Click "run" and find how big a shear stress is required to tear the blue atoms loose from the red ones.