Dear all,
I have tried to simulate the indentation of metallic Ni alloy using fix indent. However, I want to keep the indenter at a fixed position and move the specimen toward the indenter using move linear command. But in this case, the indentation doesn’t occur.
If the process is reversed, i.e. the specimen is fixed and the indenter is linearly moved, there is absolutely no problem. Indentation occurs.
I need to fix the indenter and move the specimen. Can someone help me with some suggestions.
The relevant section of the code is given below:
indenter position and radius at onset of loading
fix 4 mobile indent 1000.0 sphere 60 60 122 25 units box
fix 5 mobile move linear 0 0 5 units box
thermo 500
thermo_style custom step temp c_new v_z v_disp1 f_4[1] f_4[2] f_4[3]
dump 1 all atom 10 AlNiCo_interface_dump.indent8_3d_unload.dump*.lammpstrj
run 50000
After running this code, a warning message shows:
One or more atoms are time integrated more than once (…/modify.cpp:266)
Dear all,
I have tried to simulate the indentation of metallic Ni alloy using fix
indent. However, I want to keep the indenter at a fixed position and move
the specimen toward the indenter using move linear command. But in this
case, the indentation doesn't occur.
If the process is reversed, i.e. the specimen is fixed and the indenter is
linearly moved, there is absolutely no problem. Indentation occurs.
I need to fix the indenter and move the specimen. Can someone help me with
some suggestions.
why? this is just a change of the frame of reference. just stick with
moving the indenter.
using fix move makes no sense, as it ignores forces and moves
particles according to the prescribed path.
The relevant section of the code is given below:
# indenter position and radius at onset of loading
fix 4 mobile indent 1000.0 sphere 60 60 122 25 units box
fix 5 mobile move linear 0 0 5 units box
thermo 500
thermo_style custom step temp c_new v_z v_disp1 f_4[1] f_4[2] f_4[3]
dump 1 all atom 10
AlNiCo_interface_dump.indent8_3d_unload.dump*.lammpstrj
run 50000
After running this code, a warning message shows:
One or more atoms are time integrated more than once (../modify.cpp:266)
which is a very serious problem resulting from your bad choice of setup.
axel.
Thank you for your response.
I actually tried to simulate a thin slab diverting above the sphere (like an obstacle for the movement). That’s why I want the indenter to remain fixed.
I understand now that fix move is a wrong choice for the movement of the slab.
Can you please suggest any command for simulation such process (i.e. obstacles to the movement).
Thank you in advance.
Thank you for your response.
I actually tried to simulate a thin slab diverting above the sphere (like an
obstacle for the movement). That's why I want the indenter to remain fixed.
I understand now that fix move is a wrong choice for the movement of the
slab.
Can you please suggest any command for simulation such process (i.e.
obstacles to the movement).
as i already explained, the difference is merely in the frame of reference.
axel.