how to apply purely repulsive potential?

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1

Dear all
how can i describe repulsive potential between two atom with specific formula (k(R − r)3, r < R,) for scratch and indentation simulation ?
is there special command for this kind of potential?
Regards and thanks in advance.
soroosh

2

You can either use pair_style table to specify the forces and energies for any R within the cutoff in a file, or use pair_style python (slower) where you can provide a Python function that returns what you need.

http://lammps.sandia.gov/doc/pair_table.html

http://lammps.sandia.gov/doc/pair_python.html

Anders