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<div class="section" id="compute-smd-ulsph-stress-command">
<span id="index-0"></span><h1>compute smd/ulsph/stress command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<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">smd</span><span class="o">/</span><span class="n">ulsph</span><span class="o">/</span><span class="n">stress</span>
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="compute.html"><span class="doc">compute</span></a> command</li>
<li>smd/ulsph/stress = style name of this compute command</li>
</ul>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<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">smd</span><span class="o">/</span><span class="n">ulsph</span><span class="o">/</span><span class="n">stress</span>
</pre></div>
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<div class="section" id="description">
<h2>Description</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 class="std std-ref">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"><span class="doc">units</span></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</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 class="std std-ref">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</h2>
<p><a class="reference internal" href="compute_smd_ulsph_strain.html"><span class="doc">compute smd/ulsph/strain</span></a>, <a class="reference internal" href="compute_smd_ulsph_strain_rate.html"><span class="doc">compute smd/ulsph/strain/rate</span></a> <a class="reference internal" href="compute_smd_tlsph_stress.html"><span class="doc">compute smd/tlsph/stress</span></a></p>
<p><strong>Default:</strong> none</p>
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