# pair_style smd/tlsph command

## Syntax

pair_style smd/tlsph args


## Examples

pair_style smd/tlsph

## Description

The smd/tlsph style computes particle interactions according to continuum mechanics constitutive laws and a Total-Lagrangian Smooth-Particle Hydrodynamics algorithm.

This pair style is invoked with the following command:

pair_style smd/tlsph
pair_coeff i j *COMMON rho0 E nu Q1 Q2 hg Cp &
*END

Here, i and j denote the LAMMPS particle types for which this pair style is defined. Note that i and j must be equal, i.e., no tlsph cross interactions between different particle types are allowed. In contrast to the usual LAMMPS pair coeff definitions, which are given solely a number of floats and integers, the tlsph pair coeff definition is organized using keywords. These keywords mark the beginning of different sets of parameters for particle properties, material constitutive models, and damage models. The pair coeff line must be terminated with the *END keyword. The use the line continuation operator & is recommended. A typical invocation of the tlsph for a solid body would consist of an equation of state for computing the pressure (the diagonal components of the stress tensor), and a material model to compute shear stresses (the off-diagonal components of the stress tensor). Damage and failure models can also be added.

Please see the SMD user guide for a complete listing of the possible keywords and material models.

Mixing, shift, table, tail correction, restart, rRESPA info:

No mixing is performed automatically. Currently, no part of USER-SMD supports restarting nor minimization. rRESPA does not apply to this pair style.

## Restrictions

This fix is part of the USER-SMD package. It is only enabled if LAMMPS was built with that package. See the Build package doc page for more info.