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