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<div class="section" id="compute-plasticity-atom-command">
<span id="index-0"></span><h1>compute plasticity/atom command<a class="headerlink" href="#compute-plasticity-atom-command" title="Permalink to this headline"></a></h1>
<div class="section" id="syntax">
<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre>compute ID group-ID plasticity/atom
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in compute command</li>
<li>plasticity/atom = style name of this compute command</li>
</ul>
</div>
<div class="section" id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre>compute 1 all plasticity/atom
</pre></div>
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<div class="section" id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline"></a></h2>
<p>Define a computation that calculates the per-atom plasticity for each
atom in a group. This is a quantity relevant for <a class="reference internal" href="pair_peri.html"><em>Peridynamics models</em></a>. See <a class="reference external" href="PDF/PDLammps_overview.pdf">this document</a>
for an overview of LAMMPS commands for Peridynamics modeling.</p>
<p>The plasticity for a Peridynamic particle is the so-called consistency
parameter (lambda). For elastic deformation lambda = 0, otherwise
lambda &gt; 0 for plastic deformation. For details, see
<a class="reference internal" href="#mitchell"><span>(Mitchell)</span></a> and the PDF doc included in the LAMMPS
distro in <a class="reference external" href="PDF/PDLammps_EPS.pdf">doc/PDF/PDLammps_EPS.pdf</a>.</p>
<p>This command can be invoked for one of the Peridynamic <a class="reference internal" href="pair_peri.html"><em>pair styles</em></a>: peri/eps.</p>
<p>The plasticity value will be 0.0 for atoms not in the specified
compute group.</p>
<p><strong>Output info:</strong></p>
<p>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
Section_howto 15 for an overview of LAMMPS output options.</p>
<p>The per-atom vector values are unitlesss numbers (lambda) &gt;= 0.0.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline"></a></h2>
<p>This compute is part of the PERI package. It is only enabled if
LAMMPS was built with that package. See the <a class="reference internal" href="Section_start.html#start-3"><span>Making LAMMPS</span></a> section for more info.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline"></a></h2>
<p><code class="xref doc docutils literal"><span class="pre">compute</span> <span class="pre">damage</span></code>, <code class="xref doc docutils literal"><span class="pre">compute</span> <span class="pre">dilatation</span></code></p>
<p><strong>Default:</strong> none</p>
<hr class="docutils" />
<p id="mitchell"><strong>(Mitchell)</strong> Mitchell, &#8220;A non-local, ordinary-state-based
viscoelasticity model for peridynamics&#8221;, Sandia National Lab Report,
8064:1-28 (2011).</p>
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