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 distro 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 Section_howto 15 for an overview of LAMMPS output options.

The per-atom vector values are unitless numbers (lambda) >= 0.0.


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