forked from lijiext/lammps
71 lines
2.0 KiB
ReStructuredText
71 lines
2.0 KiB
ReStructuredText
.. index:: compute plasticity/atom
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compute plasticity/atom 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 plasticity/atom
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* ID, group-ID are documented in compute command
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* plasticity/atom = 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 plasticity/atom
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Description
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"""""""""""
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Define a computation that calculates the per-atom plasticity for each
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atom in a group. This is a quantity relevant for :doc:`Peridynamics models <pair_peri>`. See `this document <PDF/PDLammps_overview.pdf>`_
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for an overview of LAMMPS commands for Peridynamics modeling.
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The plasticity for a Peridynamic particle is the so-called consistency
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parameter (lambda). For elastic deformation lambda = 0, otherwise
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lambda > 0 for plastic deformation. For details, see
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:ref:`(Mitchell) <Mitchell>` and the PDF doc included in the LAMMPS
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distribution in `doc/PDF/PDLammps_EPS.pdf <PDF/PDLammps_EPS.pdf>`_.
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This command can be invoked for one of the Peridynamic :doc:`pair styles <pair_peri>`: peri/eps.
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The plasticity value will be 0.0 for atoms not in the specified
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compute group.
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**Output info:**
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This compute calculates a per-atom vector, which can be accessed by
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any command that uses per-atom values from a compute as input. See
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the :doc:`Howto output <Howto_output>` doc page for an overview of
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LAMMPS output options.
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The per-atom vector values are unitless numbers (lambda) >= 0.0.
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Restrictions
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""""""""""""
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This compute is part of the PERI package. It is only enabled if
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LAMMPS was built with that package. See the :doc:`Build package <Build_package>` doc page for more info.
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Related commands
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""""""""""""""""
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:doc:`compute damage/atom <compute_damage_atom>`,
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:doc:`compute dilatation/atom <compute_dilatation_atom>`
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**Default:** none
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----------
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.. _Mitchell:
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**(Mitchell)** Mitchell, "A non-local, ordinary-state-based
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viscoelasticity model for peridynamics", Sandia National Lab Report,
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8064:1-28 (2011).
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