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<li>compute dilatation/atom command</li>
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<div class="section" id="compute-dilatation-atom-command">
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<span id="index-0"></span><h1>compute dilatation/atom command</h1>
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<div class="section" id="syntax">
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<h2>Syntax</h2>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">compute</span> <span class="n">ID</span> <span class="n">group</span><span class="o">-</span><span class="n">ID</span> <span class="n">dilatation</span><span class="o">/</span><span class="n">atom</span>
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</pre></div>
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<ul class="simple">
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<li>ID, group-ID are documented in compute command</li>
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<li>dilation/atom = style name of this compute command</li>
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</ul>
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</div>
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<div class="section" id="examples">
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<h2>Examples</h2>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">compute</span> <span class="mi">1</span> <span class="nb">all</span> <span class="n">dilatation</span><span class="o">/</span><span class="n">atom</span>
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</pre></div>
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</div>
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</div>
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<div class="section" id="description">
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<h2>Description</h2>
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<p>Define a computation that calculates the per-atom dilatation for each
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atom in a group. This is a quantity relevant for <a class="reference internal" href="pair_peri.html"><span class="doc">Peridynamics models</span></a>. See <a class="reference external" href="PDF/PDLammps_overview.pdf">this document</a>
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for an overview of LAMMPS commands for Peridynamics modeling.</p>
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<p>For small deformation, dilatation of is the measure of the volumetric
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strain.</p>
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<p>The dilatation “theta” for each peridynamic particle I is calculated
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as a sum over its neighbors with unbroken bonds, where the
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contribution of the IJ pair is a function of the change in bond length
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(versus the initial length in the reference state), the volume
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fraction of the particles and an influence function. See the
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<a class="reference external" href="http://www.sandia.gov/~mlparks/papers/PDLAMMPS.pdf">PDLAMMPS user guide</a> for a formal
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definition of dilatation.</p>
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<p>This command can only be used with a subset of the Peridynamic <a class="reference internal" href="pair_peri.html"><span class="doc">pair styles</span></a>: peri/lps, peri/ves and peri/eps.</p>
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<p>The dilatation value will be 0.0 for atoms not in the specified
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compute group.</p>
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<p><strong>Output info:</strong></p>
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<p>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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Section_howto 15 for an overview of LAMMPS output options.</p>
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<p>The per-atom vector values are unitlesss numbers (theta) >= 0.0.</p>
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</div>
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<div class="section" id="restrictions">
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<h2>Restrictions</h2>
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<p>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 <a class="reference internal" href="Section_start.html#start-3"><span class="std std-ref">Making LAMMPS</span></a> section for more info.</p>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands</h2>
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<p><span class="xref doc">compute damage</span>, <span class="xref doc">compute plasticity</span></p>
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<p><strong>Default:</strong> none</p>
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