# compute smd/damage command

## Syntax

    compute ID group-ID smd/damage

-   ID, group-ID are documented in [compute](compute) command
-   smd/damage = style name of this compute command

## Examples

``` LAMMPS
compute 1 all smd/damage
```

## Description

Define a computation that calculates the damage status of SPH particles
according to the damage model which is defined via the SMD SPH pair
styles, e.g., the maximum plastic strain failure criterion.

See [this PDF guide](PDF/MACHDYN_LAMMPS_userguide.pdf)\_ to use Smooth
Mach Dynamics in LAMMPS.

**Output Info:**

This compute calculates a per-particle vector, which can be accessed by
any command that uses per-particle values from a compute as input. See
the [Howto output](Howto_output) page for an overview of LAMMPS output
options.

The per-particle values are dimensionless an in the range of zero to
one.

## Restrictions

This compute is part of the MACHDYN package. It is only enabled if
LAMMPS was built with that package. See the \"Build

## Related commands

[smd/plastic_strain](compute_smd_plastic_strain),
[smd/tlsph_stress](compute_smd_tlsph_stress)

## Default

none