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


Characteristics of modeling
-----------------------------------

MEC3TR7H (degenerate 3D shell)


.. image:: images/10000A70000069BB00001B14A58729DAFC3CEB23.svg
    :width: 283
    :height: 72


.. _RefImage_10000A70000069BB00001B14A58729DAFC3CEB23.svg:

modeling COQUE_3D - regular but not symmetric mesh.

The problem data corresponds to a thin shell

.. image:: images/Object_7.svg
    :width: 283
    :height: 72


.. _RefImage_Object_7.svg:

which is severe for finite element MECQTR7H (case of transverse shear blockage).


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

Number of knots: 33

Number of meshes and type: 20 TRIA7


Tested features
-----------------------


* The geometric nonlinear element COQUE_3D,


* The static algorithm for updating large rotations GROT_GDEP from STAT_NON_LINE,


* The use of a follower pressure.


B modeling results
------------------------------

History of horizontal displacement :math:`\mathit{DX}` (:math:`m`) in the middle of :math:`\mathit{P1P2}`


.. csv-table::

    "**Moment**", "**Press**
    **p**", "**Reference**
    **(Samcef)**"



.. csv-table::

    "11. ", "11. ", "-7.36640 E+00"
    "22. ", "22. ", "-1.35098 E+01"


History of vertical displacement :math:`\mathit{DZ}` (:math:`m`) in the middle of :math:`\mathit{P1P2}`


.. csv-table::

    "**Moment**", "**Press**
    :math:`P` ", "**Reference**
    **(Samcef)**"



.. csv-table::

    "11. ", "11. ", "-8.44920 E+00"
    "22. ", "22. ", "-5.78828 E+00"


Horizontal rotation story :math:`\mathit{DRY}` in the middle of :math:`\mathit{P1P2}`


.. csv-table::

    "**Moment**", "**Press**
    :math:`p` ", "**Reference**
    **(Samcef)**"



.. csv-table::

    "11. ", "11. ", "1.69200 E+00"
    "22. ", "22. ", "2.82168 E+00"



notes
---------

The mesh in modeling B is a regular but not symmetric mesh. The reference solution mesh is built with 20 quadrangles with 4 nodes each.

We use the value of COEF_RIGI_DRZ = 0.001.

Although the problem being studied is a thin shell problem

.. image:: images/Object_8.svg
    :width: 283
    :height: 72


.. _RefImage_Object_8.svg:

, the triangle elements reach a high load level: 22 steps for 26 with the quadrangles. The solution with triangle elements is therefore very satisfactory.