forked from lijiext/lammps
65 lines
1.7 KiB
Plaintext
65 lines
1.7 KiB
Plaintext
.. index:: compute smd/ulsph/stress
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compute smd/ulsph/stress command
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================================
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Syntax
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""""""
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.. parsed-literal::
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compute ID group-ID smd/ulsph/stress
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* ID, group-ID are documented in :doc:`compute <compute>` command
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* smd/ulsph/stress = style name of this compute command
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Examples
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""""""""
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.. parsed-literal::
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compute 1 all smd/ulsph/stress
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Description
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"""""""""""
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Define a computation that outputs the Cauchy stress tensor.
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See `this PDF guide <USER/smd/SMD_LAMMPS_userguide.pdf>`_ to using Smooth
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Mach Dynamics in LAMMPS.
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**Output info:**
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This compute calculates a per-particle vector of vectors (tensors),
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which can be accessed by any command that uses per-particle values
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from a compute as input. See :ref:`Section_howto 15 <howto_15>` for an overview of LAMMPS output
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options.
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The values will be given in :doc:`units <units>` of pressure.
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The per-particle vector has 7 entries. The first six entries
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correspond to the xx, yy, zz, xy, xz, yz components of the symmetric
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Cauchy stress tensor. The seventh entry is the second invariant of the
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stress tensor, i.e., the von Mises equivalent stress.
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Restrictions
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""""""""""""
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This compute is part of the USER-SMD package. It is only enabled if
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LAMMPS was built with that package. See the :ref:`Making LAMMPS <start_3>` section for more info. This compute
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can only be used for particles which interact with the updated
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Lagrangian SPH pair style.
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Related commands
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""""""""""""""""
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:doc:`compute smd/ulsph/strain <compute_smd_ulsph_strain>`, :doc:`compute smd/ulsph/strain/rate <compute_smd_ulsph_strain_rate>` :doc:`compute smd/tlsph/stress <compute_smd_tlsph_stress>`
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**Default:** none
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.. _lws: http://lammps.sandia.gov
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.. _ld: Manual.html
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.. _lc: Section_commands.html#comm
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