65 lines
1.7 KiB
ReStructuredText
65 lines
1.7 KiB
ReStructuredText
.. index:: compute smd/tlsph/stress
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compute smd/tlsph/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/tlsph/stress
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* ID, group-ID are documented in :doc:`compute <compute>` command
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* smd/tlsph/stress = style name of this compute command
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Examples
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""""""""
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.. code-block:: LAMMPS
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compute 1 all smd/tlsph/stress
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Description
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"""""""""""
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Define a computation that outputs the Cauchy stress tensor for
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particles interacting via the Total-Lagrangian SPH pair style.
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See `this PDF guide <PDF/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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"""""""""""
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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 the :doc:`Howto output <Howto_output>` doc
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page for an overview of LAMMPS output 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 and yz components of the
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symmetric Cauchy stress tensor. The seventh entry is the second
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invariant of the 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 MACHDYN package. It is only enabled if
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LAMMPS was built with that package. See the :doc:`Build package <Build_package>` page for more info.
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This quantity will be computed only for particles which interact with
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the Total-Lagrangian SPH pair style.
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Related commands
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""""""""""""""""
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:doc:`compute smd/tlsph/strain <compute_smd_tlsph_strain>`, :doc:`cmopute smd/tlsph/strain/rate <compute_smd_tlsph_strain_rate>`
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Default
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"""""""
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none
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