Hello,
This is a lammps code from the examples folder to simulate shearing in a material. Will the pressure output in the log file represent the shear stress experienced by the system? Or does it need some readjustment to get the shear stress on the top surface that is being moved.
3d metal shear simulation
units metal
boundary s s p
atom_style atomic
lattice fcc 3.52
region box block 0 16.0 0 10.0 0 2.828427
create_box 3 box
lattice fcc 3.52 orient x 1 0 0 orient y 0 1 1 orient z 0 -1 1 &
origin 0.5 0 0
create_atoms 1 box
pair_style eam
pair_coeff * * Ni_u3.eam
neighbor 0.3 bin
neigh_modify delay 5
region lower block INF INF INF 0.9 INF INF
region upper block INF INF 6.1 INF INF INF
group lower region lower
group upper region upper
group boundary union lower upper
group mobile subtract all boundary
set group lower type 2
set group upper type 3
void
#region void cylinder z 8 5 2.5 INF INF
#delete_atoms region void
temp controllers
compute new3d mobile temp
compute new2d mobile temp/partial 0 1 1
equilibrate
velocity mobile create 300.0 5812775 temp new3d
fix 1 all nve
fix 2 boundary setforce 0.0 0.0 0.0
fix 3 mobile temp/rescale 10 300.0 300.0 10.0 1.0
fix_modify 3 temp new3d
thermo 25
thermo_modify temp new3d
timestep 0.001
run 100
velocity upper set 1.0 0 0
velocity mobile ramp vx 0.0 1.0 y 1.4 8.6 sum yes
unfix 3
fix 3 mobile temp/rescale 10 300.0 300.0 10.0 1.0
fix_modify 3 temp new2d
dump 1 all atom 100 dump.shear
thermo 100
thermo_modify temp new2d
reset_timestep 0
run 3000