forked from lijiext/lammps
59 lines
2.0 KiB
HTML
59 lines
2.0 KiB
HTML
<HTML>
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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>
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<HR>
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<H3>compute smd/tlsph_stress command
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</H3>
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<P><B>Syntax:</B>
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</P>
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<PRE>compute ID group-ID smd/tlsph_stress
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</PRE>
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<UL><LI>ID, group-ID are documented in <A HREF = "compute.html">compute</A> command
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<LI>smd/tlsph_stress = style name of this compute command
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</UL>
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<P><B>Examples:</B>
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</P>
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<PRE>compute 1 all smd/tlsph_stress
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</PRE>
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<P><B>Description:</B>
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</P>
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<P>Define a computation that outputs the Cauchy stress tensor for particles interacting via the Total-Lagrangian SPH pair style.
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</P>
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<P>See <A HREF = "USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</A> to using Smooth Mach Dynamics in LAMMPS.
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</P>
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<P><B>Output info:</B>
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</P>
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<P>This compute calculates a per-particle vector of vectors (tensors), which can be
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accessed by any command that uses per-particle values from a compute as input. See
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<A HREF = "Section_howto.html#howto_15">How-to discussions, section 6.15</A>
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for an overview of LAMMPS output options.
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</P>
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<P>The values will be given in <A HREF = "units.html">units</A> of pressure.
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</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 and 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.
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</P>
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<P><B>Restrictions:</B>
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</P>
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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 HREF = "Section_start.html#start_3">Making LAMMPS</A>
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section for more info.
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</P>
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<P>This quantity will be computed only for particles which interact with the Total-Lagrangian SPH pair style.
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</P>
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<P><B>Related commands:</B>
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</P>
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<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>
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</P>
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<P><B>Default:</B> none
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</P>
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</HTML>
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