PDLAMMPs- Crack growth with deformation box

Hi all,
I want to simulate surface crack existed on silicon surface, and apply the velocity along specific direction to see how crack elongate. However, the crack doesn’t propagate after the simulation. My input script is as follows:

3D Peridynamic simulation

units si
#dimension 3
boundary s s s
atom_style peri
atom_modify map array
neighbor 0.0010 bin