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			<div class="section" id="compute-dilatation-atom-command">
			<span id="index-0"></span><h1>compute dilatation/atom command<a class="headerlink" href="#compute-dilatation-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 dilatation/atom
			</pre></div>
			</div>
			<ul class="simple">
			<li>ID, group-ID are documented in compute command</li>
			<li>dilation/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 dilatation/atom
			</pre></div>
			</div>
			</div>
			<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 dilatation 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>For small deformation, dilatation of is the measure of the volumetric
			strain.</p>
			<p>The dilatation “theta” for each peridynamic particle I is calculated
			as a sum over its neighbors with unbroken bonds, where the
			contribution of the IJ pair is a function of the change in bond length
			(versus the initial length in the reference state), the volume
			fraction of the particles and an influence function. See the
			<a class="reference external" href="http://www.sandia.gov/~mlparks/papers/PDLAMMPS.pdf">PDLAMMPS user guide</a> for a formal
			definition of dilatation.</p>
			<p>This command can only be used with a subset of the Peridynamic <a class="reference internal" href="pair_peri.html"><em>pair styles</em></a>: peri/lps, peri/ves and peri/eps.</p>
			<p>The dilatation 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 (theta) >= 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">plasticity</span></code></p>
			<p><strong>Default:</strong> none</p>
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