B modeling
==============

In **B modeling**, we study only half of a 2D structure with, at first, the definition of the upper lip of the crack and then defining only the bottom node. We thus test the keyword SYME =' OUI 'of the command DEFI_FOND_FISS in 2D.


Characteristics of the mesh
-----------------------------

     The mesh is shown in the following figure:


.. image:: images/100000000000057F000002BF9F7235CAF30FEBEE.png
    :width: 6.7063in
    :height: 3.1929in


.. _RefImage_100000000000057F000002BF9F7235CAF30FEBEE.png:

It is composed of 222 knots for 395 TRIA3 elements. The crack bottom is composed of a single node located at coordinate :math:`(0.5\mathrm{,0}.5)`.


Tested sizes and results
------------------------------


* DEFI_FOND_FISS with SYME =' OUI 'and LEVRE_SUP:


.. csv-table::

    "**Quantities**", "**Analytical value**"
    "**VNORX**", "0.0"
    "**VNORY**", "-1.0"
    "**VDIRX**", "1.0"
    "**VDIRY**", "0.0"