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			cohesive
			''''''''

			In ``cohesive/plate.py``, an example of extrinsic cohesive elements insertion is shown. This example simulates a plate
			with a pre-existing crack pulled. The geometry is depicted in :numref:`fig-ex-cohesive_plate`.

			.. _fig-ex-cohesive_plate:
			.. figure:: examples/python/solid_mechanics_cohesive_model/cohesive/images/plate.svg
			:align: center
			:width: 30%

			Problem geometry.

			The problem is solved statically until the onset of instability and is then solved dynamically with an explicit
			integration scheme. This is done by adding a new solver with ``model.initNewSolver()``::
			model = aka.SolidMechanicsModelCohesive(mesh)
			model.initFull(_analysis_method=aka._static, _is_extrinsic=True)
			model.initNewSolver(aka._explicit_lumped_mass)
			[....]
			model.solveStep("static")
			[....]
			model.solveStep("explicit_lumped")

			The crack opening is displayed in :numref:`fig-ex-cohesive_plate_gif`.

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

			Stresses in the plate.