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<title>compute smd/ulsph_stress command &mdash; LAMMPS 17 Dec 2015 documentation</title>
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<div class="section" id="compute-smd-ulsph-stress-command">
<span id="index-0"></span><h1>compute smd/ulsph_stress command<a class="headerlink" href="#compute-smd-ulsph-stress-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 smd/ulsph_stress
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="compute.html"><em>compute</em></a> command</li>
<li>smd/ulsph_stress = 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 smd/ulsph_stress
</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 outputs the Cauchy stress tensor.</p>
<p>See <a class="reference external" href="USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</a> to using Smooth Mach Dynamics in LAMMPS.</p>
<p><strong>Output info:</strong></p>
<p>This compute calculates a per-particle vector of vectors (tensors),
which can be accessed by any command that uses per-particle values
from a compute as input. See <a class="reference internal" href="Section_howto.html#howto-15"><span>Section_howto 15</span></a>
for an overview of LAMMPS output options.</p>
<p>The values will be given in <a class="reference internal" href="units.html"><em>units</em></a> of pressure.</p>
<p>The per-particle vector has 7 entries. The first six entries correspond to the xx, yy, zz, xy, xz, yz components
of the symmetric Cauchy stress tensor. The seventh entry is the second invariant of the stress tensor, i.e.,
the von Mises equivalent stress.</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 USER-SMD 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. This compute can only be used for particles which interact with the updated Lagrangian SPH pair style.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline"></a></h2>
<pre class="literal-block">
<a class="reference internal" href="compute_smd_ulsph_strain.html"><em>smd/ulsph_strain</em></a>, <a class="reference internal" href="compute_smd_ulsph_strain_rate.html"><em>smd/ulsph_strain_rate</em></a>
<a class="reference internal" href="compute_smd_tlsph_stress.html"><em>smd/tlsph_stress</em></a>
</pre>
<p><strong>Default:</strong> none</p>
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