Mean effective stress
==========================

Overview
--------

This is the mean effective stress defined by

.. math::
   \sigma_e = \frac{\sigma_{11}+\sigma_{22}+\sigma_{33}}{3}

with :math:`\bm{\sigma}` being the full stress tensor.

Parameters
----------

None.

Class description
-----------------

.. doxygenclass:: neml::MeanEffectiveStress
   :members:
   :undoc-members: