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			Phase-field model (2D) [Unstable]
			`````````````````````````````````

			static
			''''''

			:Sources:

			.. collapse:: phase_field_notch.cc (click to expand)

			.. literalinclude:: examples/c++/phase_field_model/phase_field_notch.cc
			:language: c++
			:lines: 20-

			.. collapse:: material_notch.dat (click to expand)

			.. literalinclude:: examples/c++/phase_field_model/material_notch.dat
			:language: text

			:Location:

			``examples/c++/`` `phase_field_model <https://gitlab.com/akantu/akantu/-/blob/master/examples/c++/phase_field_model>`_


			`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.