why the element warped when I simulate a indentation?

[Jesse]

Dear professor:

    when I simulate a indentation with a external potential,the warped element occur 

as the indenter push in only 1nm of depth, and the dipole of dislocation become disorder.

 I try to control the indenter move up and unload the loader,the output file will prompt:

 warning! element-inversion in elem# ****

    Is that the problem of stiffness associated with the repulsive field?

 Further more, How could I certain the value of the stiffness as a parameter?

                                                                      yours sincerely

                                                                       Jesse Fang

[Ellad Tadmor]

You would only get element inversion in local elements. You have either
not turned on the nonlocal calculations or your nonlocal region is too
small.

-Ellad Tadmor

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