[lammps-users] How to understand this command?

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1


Hi,everyone,
In my file;I use the command:"compute 1 mobile reduce fx fy"
In my simulation,I want to output the cutting force,which means the force between the atoms of workpiece and the atoms of tool.
Question 1:
In the command,“fx” and “fy” mean what?
Assuming that the group mobile stands for the atoms of workpiece.Does “fx” stands for the force in the x-direction that the tool acts on the workpiece?Does it include the force that the atoms only in the workpiece interact with each other?
Question 2:
I’m confused.I only want to get the cutting force between tool and workpiece.How can I make that?Using which command?
And in my simulation I consider the tool as rigid body.
Thank you!
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2

Comments below.

Steve


Hi,everyone,
In my file;I use the command:"compute 1 mobile reduce fx fy"
In my simulation,I want to output the cutting force,which means the force between the atoms of workpiece and the atoms of tool.
Question 1:
In the command,“fx” and “fy” mean what?

Force in the x and y dim on the atoms in the group.


Assuming that the group mobile stands for the atoms of workpiece.Does “fx” stands for the force in the x-direction that the tool acts on the workpiece?Does it include the force that the atoms only in the workpiece interact with each other?

The latter, but those forces should cancel. So effectively the former.


Question 2:
I’m confused.I only want to get the cutting force between tool and workpiece.How can I make that?Using which command?

What you have should work. You can also look at compute group/group.