- The type of hardening law is defined with the ``HARDENING MODEL`` command line, other hardening commands then define the specific shape of that hardening curve.

- The hardening modulus for a linear hardening model is defined with the ``HARDENING MODULUS`` command line.

- The hardening constant for a power law hardening model is defined with the ``HARDENING CONSTANT`` command line.

- The hardening exponent for a power law hardening model is defined with the ``HARDENING EXPONENT`` command line.

- The Luders strain for a power law hardening model is defined with the ``LUDERS STRAIN`` command line.

- The hardening function for a user defined hardening model is defined with the ``HARDENING FUNCTION`` command line.

- The shape of the spline for the spline based hardening is defined by the ``CUBIC SPLINE TYPE``, ``CARDINAL PARAMETER``, ``KNOT EQPS``, and ``KNOT STRESS`` command lines.