Phase-field model
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static
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`phase_field_notch.cc` shows hot to set a quasi-static fracture simulation with phase-field. The geometry of the solid is a square plate with a notch. The loading is an imposed displacement at the top of the plate (mode I).

.. figure:: examples/python/phase_field_model/images/phasefield-static-geo.svg
:align: center
:width: 50%

Notched plate with boundary conditions and imposed displacement.

In addition, this example shows how to extract clusters delimited by the mesh boundaries and elements with damage values beyond a threshold. This can be useful to extract fragments after crack propagation.

.. figure:: examples/c++/phase_field_model/images/phase_field_clusters.png
:align: center
:width: 90%

Damage field after a few iterations and two clusters (fragments) extracted.