To all lammps user.

I try to use fix_addforce command to apply a tensile stress to my specimen.

I

I use SI unit, so the force unit is newton.

The description of “fix_addforce” is Add fx,fy,fz to the corresponding component of force for each atom in the group.

If I want to calculate the stress I applied to each atom, the equation P=F/A what is the area value I should use? Area of single atom or area of wall ?

Thanks for your help

Regards

Wei-Jie Huang

To all lammps user.

I try to use fix_addforce command to apply a tensile stress to my specimen.

I

I use SI unit, so the force unit is newton.

The description of "fix_addforce" is Add fx,fy,fz to the corresponding

component of force for each atom in the group.

If I want to calculate the stress I applied to each atom, the equation P=F/A

what is the area value I should use? Area of single atom or area of wall ?

that depends on what you use for F, the total force or the force per atom.