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<div class="section" id="compute-smd-tlsph-stress-command">
<span id="index-0"></span><h1>compute smd/tlsph/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">tlsph</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/tlsph/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">tlsph</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 for
particles interacting via the Total-Lagrangian SPH pair style.</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">How-to discussions, section 6.15</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 and 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.</p>
<p>This quantity will be computed only for particles which interact with
the Total-Lagrangian SPH pair style.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><a class="reference internal" href="compute_smd_tlsph_strain.html"><span class="doc">compute smd/tlsph/strain</span></a>, <a class="reference internal" href="compute_smd_tlsph_strain_rate.html"><span class="doc">cmopute smd/tlsph/strain/rate</span></a></p>
<p><strong>Default:</strong> none</p>
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