How to introduce initial crack in the amorphous polymer bulk?

Dear Everyone,

I want to simulate how the crack propagates in an amorphous polymer bulk [e.g. Polycarbonate (PC)] when I deform the material.

First, I have to introduce an initial crack in the polymer system I construct, then I will apply the deformation to make the crack propagate?

My question is that is there any command or method to make this crack in Lammps?

Thank you very much for any suggestion,

Lili

Dear Everyone,

I want to simulate how the crack propagates in an amorphous polymer bulk
[e.g. Polycarbonate (PC)] when I deform the material.

First, I have to introduce an initial crack in the polymer system I
construct, then I will apply the deformation to make the crack propagate?

My question is that is there any command or method to make this crack in
Lammps?

did you have a look at the crack example that ships with LAMMPS?
too obvious?

axel.

https://icme.hpc.msstate.edu/mediawiki/index.php/LAMMPS_tutorials