compute plasticity/atom command


compute ID group-ID plasticity/atom
  • ID, group-ID are documented in compute command

  • plasticity/atom = style name of this compute command


compute 1 all plasticity/atom


Define a computation that calculates the per-atom plasticity for each atom in a group. This is a quantity relevant for Peridynamics models. See this document for an overview of LAMMPS commands for Peridynamics modeling.

The plasticity for a Peridynamic particle is the so-called consistency parameter (\(\lambda\)). For elastic deformation, \(\lambda = 0\), otherwise \(\lambda > 0\) for plastic deformation. For details, see (Mitchell) and the PDF doc included in the LAMMPS distribution in doc/PDF/PDLammps_EPS.pdf.

This command can be invoked for one of the Peridynamic pair styles: peri/eps.

The plasticity value will be 0.0 for atoms not in the specified compute group.

Output info

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

The per-atom vector values are unitless numbers \(\lambda \ge 0.0\).


This compute is part of the PERI package. It is only enabled if LAMMPS was built with that package. See the Build package page for more info.



(Mitchell) Mitchell, “A non-local, ordinary-state-based viscoelasticity model for peridynamics”, Sandia National Lab Report, 8064:1-28 (2011).