graphene tensile test

Hi ,everyone, I read a topic on the lammps-users. (Graphene Tesile Test-critical strain is too high) So I run a simulationa with your input script by myself , and get the stress-strain curve . Firstly, I have a doubt that why the cuvre has a lot of ups and downs. Secondly ,the press is not zero when the strain is zero. Any suggestions would be greatly appreciated.

300K tensile.jpg

MD simulations have noise. I don't know who's
script "yours" is, but I suggest you talk to the author
of the script.