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<CENTER><A HREF = "http://lammps.sandia.gov">LAMMPS WWW Site</A> - <A HREF = "Manual.html">LAMMPS Documentation</A> - <A HREF = "Section_commands.html#comm">LAMMPS Commands</A>
</CENTER>
<HR>
<H3>compute smd/tlsph_stress command
</H3>
<P><B>Syntax:</B>
</P>
<PRE>compute ID group-ID smd/tlsph_stress
</PRE>
<UL><LI>ID, group-ID are documented in <A HREF = "compute.html">compute</A> command
<LI>smd/tlsph_stress = style name of this compute command
</UL>
<P><B>Examples:</B>
</P>
<PRE>compute 1 all smd/tlsph_stress
</PRE>
<P><B>Description:</B>
</P>
<P>Define a computation that outputs the Cauchy stress tensor for particles interacting via the Total-Lagrangian SPH pair style.
</P>
<P>See <A HREF = "USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</A> to using Smooth Mach Dynamics in LAMMPS.
</P>
<P><B>Output info:</B>
</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 HREF = "Section_howto.html#howto_15">How-to discussions, section 6.15</A>
for an overview of LAMMPS output options.
</P>
<P>The values will be given in <A HREF = "units.html">units</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>
<P><B>Restrictions:</B>
</P>
<P>This compute is part of the USER-SMD package. It is only enabled if
LAMMPS was built with that package. See the <A HREF = "Section_start.html#start_3">Making LAMMPS</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>
<P><B>Related commands:</B>
</P>
<P><A HREF = "compute_smd_tlsph_strain.html">smd/tlsph_strain</A>, <A HREF = "compute_smd_tlsph_strain_rate.html">smd/tlsph_strain_rate</A>
</P>
<P><B>Default:</B> none
</P>
</HTML>
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