lammps/examples/indent/in.indent.min

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# 2d indenter simulation with minimization instead of dynamics
dimension 2
boundary p s p
atom_style atomic
neighbor 0.3 bin
neigh_modify delay 5
# create geometry
lattice hex 0.9
region box block 0 20 0 10 -0.25 0.25
create_box 2 box
create_atoms 1 box
mass * 1.0
# LJ potentials
pair_style lj/cut 2.5
pair_coeff * * 1.0 1.0 2.5
# define groups
region 1 block INF INF INF 1.25 INF INF
group lower region 1
group mobile subtract all lower
set group lower type 2
# initial velocities
fix 2 lower setforce 0.0 0.0 0.0
# indenter
fix 5 all enforce2d
# minimize with indenter
thermo 10
dump 1 all atom 10 dump.indent
dump_modify 1 scale no
minimize 1.0e-6 1.0e-6 1000 1000
variable k equal 5000.0/xlat
variable k1 equal 1000.0/xlat
fix 4 all indent $k sphere 10 13.0 0 6.0
fix_modify 4 energy yes
minimize 1.0e-6 1.0e-6 1000 1000
fix 4 all indent ${k1} sphere 10 12.5 0 6.0
fix_modify 4 energy yes
minimize 1.0e-6 1.0e-6 1000 1000
fix 4 all indent ${k1} sphere 10 12.0 0 6.0
fix_modify 4 energy yes
minimize 1.0e-6 1.0e-6 1000 1000
fix 4 all indent ${k1} sphere 10 11.4 0 6.0
fix_modify 4 energy yes
minimize 1.0e-6 1.0e-6 1000 1000
fix 4 all indent ${k1} sphere 10 11.2 0 6.0
fix_modify 4 energy yes
minimize 1.0e-6 1.0e-6 1000 1000
fix 4 all indent ${k1} sphere 10 11.0 0 6.0
fix_modify 4 energy yes
minimize 1.0e-6 1.0e-6 1000 1000