4 Screw dislocation

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Here is another kind of dislocation, called a screw dislocation. Repeat the experiment of applying a shear force to see:

  1. in what direction the dislocation moves.
  2. in what direction the atoms move as the dislocation moves by.
The operation of this dislocation is more subtle than that of the edge dislocation.

beta is the shear force constant between atoms in different rows. How do the structure of the dislocation and the shear force required for motion vary with beta over the range 2 to 20? (You can drag the slider beyond the end of its range.)

(To make a screw dislocation, drag an arrow vertically in the array with the RIGHT mouse button. See Special features for more information.)