[lammps-users] Unit of Stress?

Dear Lammps_users

    What is the unit of stress?
      Should it be force over ares(eV/A**3) or the pressure (bars)?

Best Regards

Zhenyu Yang
  State Key Laboratory of Nonlinear Mechanics (LNM)
  Institute of Mechanics, Chinese Academy of Sciences
  No.15 Beisihuanxi Road
  Beijing 100080, P. R. China
  FAX: 010-62579511
[email protected]

The stress unit is 10^(-25) N-m. If you need stress in bars then you
have to divide the stress output by the volume in Angstrom^3.

Stress = output/(volume in A^3) = bars


Zhenyu Yang wrote:

yes - this is explained in the doc page for the dump command.

The stress tensor components are really stress-volume or
pressure-volume. Thus if you multiply by Ang^3 you get
the native pressure units (see the units command).