fragmentation
'''''''''''''

``fragmentation`` shows an example of a 1D bar fragmentation with extrinsic cohesive elements. It uses a custom boundary
condition to impose a constant velocity. This is done by creating a class that inherits from ``DirichletFunctor``.
The result is shown in :numref:`fig-ex-fragmentation`.

.. _fig-ex-fragmentation:
.. figure:: examples/python/solid_mechanics_cohesive_model/fragmentation/images/fragmentation.gif
:align: center
:width: 100%

1D bar fragmentation.