Reference problem
=====================


Geometry
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Geometry is a cracked plate of which only the upper part is modelled.


Material properties
----------------------

The massif consists of a linear isotropic elastic material:


* Isotropic elasticity Young's modulus: :math:`E=200000\mathrm{Pa}`


* Poisson's ratio: :math:`\nu =\mathrm{0,3}`


Boundary conditions and loads
-------------------------------------

Unitary pressure is imposed on the top of the plate.

For reasons of symmetry, the ligament of the crack is blocked along axis :math:`Y` and the node at the end of the ligament is blocked along axis :math:`X`.