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<title>compute smd/ulsph_stress command — LAMMPS 15 May 2015 version documentation</title>
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<li>compute smd/ulsph_stress command</li>
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<div class="section" id="compute-smd-ulsph-stress-command">
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<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>
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<div class="section" id="syntax">
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<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>compute ID group-ID smd/ulsph_stress
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</pre></div>
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</div>
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<ul class="simple">
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<li>ID, group-ID are documented in <a class="reference internal" href="compute.html"><em>compute</em></a> command</li>
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<li>smd/ulsph_stress = 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<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>compute 1 all smd/ulsph_stress
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</pre></div>
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</div>
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<div class="section" id="description">
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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>Define a computation that outputs the Cauchy stress tensor.</p>
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<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>
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<p><strong>Output info:</strong></p>
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<p>This compute calculates a per-particle vector of vectors (tensors),
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which can be accessed by any command that uses per-particle values
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from a compute as input. See <a class="reference internal" href="Section_howto.html#howto-15"><span>Section_howto 15</span></a>
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for an overview of LAMMPS output options.</p>
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<p>The values will be given in <a class="reference internal" href="units.html"><em>units</em></a> of pressure.</p>
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<p>The per-particle vector has 7 entries. The first six entries correspond to the xx, yy, zz, xy, xz, yz components
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of the symmetric Cauchy stress tensor. The seventh entry is the second invariant of the stress tensor, i.e.,
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the von Mises equivalent stress.</p>
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</div>
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<div class="section" id="restrictions">
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<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></h2>
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<p>This compute is part of the USER-SMD 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>Making LAMMPS</span></a>
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section for more info. This compute can only be used for particles which interact with the updated Lagrangian SPH pair style.</p>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline">¶</a></h2>
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<pre class="literal-block">
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<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>
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<a class="reference internal" href="compute_smd_tlsph_stress.html"><em>smd/tlsph_stress</em></a>
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</pre>
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<p><strong>Default:</strong> none</p>
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