[lammps-users] shear strain repetition

hi lammps community ,

i am trying to apply shear strain on the lco model.
the material gets strained however after some deformation it starts again from the starting position as can be seen in the attached video file link after 2 seconds and at 67 step of simulation.

is this has some connection with periodic boundary condition? or where is this coming from?

input file:

lco yz shear strain 1:1

box tilt large
#change_box all triclinic
read_restart lco300.equil

kspace_style ewald 1.0e-6
pair_style buck/coul/long/cs 9.0 #A, rho, C
pair_coeff * * 0.0 1.000 0.00
pair_coeff 1 5 632.1018 0.2906 0.0000
pair_coeff 3 5 1670.2416 0.28 0.0000
pair_coeff 5 5 22764.3 0.149 44.53

special_bonds lj/coul 0 1 1

bond_style harmonic
bond_coeff 1 110.5 0.0
bond_coeff 2 65.0 0.0

reset_timestep 0
timestep 0.001

fix 5 all nvt temp 300 300 0.05
fix 6 all deform 1 yz erate 0.005 remap x units box

compute peratom all stress/atom NULL
compute p all reduce sum c_peratom[6]

compute mytemp all temp/deform
fix_modify 5 temp mytemp

variable syz equal c_p/vol/10000
variable eyz equal step0.0010.005

thermo 1000
thermo_style custom step pe ke etotal temp press lx ly lz vol v_syz v_eyz

dump out all atom 1000 dumpz.5strain.lco.lammpstrj

run 100000

video link: https://drive.google.com/file/d/1EBEZjP0DV_D3iLgXuIXxugHyo6JalIvj/view?usp=sharing

thanks a lot in advanced

This is documented behavior. Please study the fix deform documentation carefully. It contains many details, specifically about deforming by tilt factors. Please also see the explanation of the flip keyword.

Thanks Axel for your guidance, change the flip keyword to no and now its working.