D modeling
==============


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


.. image:: images/Object_20.svg
    :width: 626
    :height: 197


.. _RefImage_Object_20.svg:


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

Number of knots: 54

Number of meshes and type: 10 QUAD9


Tested values
---------------


+------------------------------------------------------------------------------------+------------------+-----------+-------------+---------+----------------+
|                                                                                    |**Identification**|**Moments**|**Reference**|**Aster**|**% difference**|
+ .. image:: images/Object_21.svg                                                    +                  +           +             +         +                +
|    :width: 626                                                                     |                  |           |             |         |                |
+    :height: 197                                                                    +                  +           +             +         +                +
|                                                                                    |                  |           |             |         |                |
+                                                                                    +                  +           +             +         +                +
|                                                                                    |                  |           |             |         |                |
+------------------------------------------------------------------------------------+------------------+-----------+-------------+---------+----------------+
|5                                                                                   |ETA_PILOTAGE      |5          |1.0          |1.0978   |9.78            |
+------------------------------------------------------------------------------------+------------------+-----------+-------------+---------+----------------+
|25                                                                                  |ETA_PILOTAGE      |25         |1.0          |1.1085   |10.85           |
+------------------------------------------------------------------------------------+------------------+-----------+-------------+---------+----------------+



notes
---------

In this analysis, an imposed displacement type resolution technique ('DDL_IMPO') is used to find the solution. This method provides for each imposed displacement value, a load multiplier coefficient ('ETA_PILOTAGE'). The value of the load imposed in 'AFFE_CHAR_MECA' is equal to the limit pressure, therefore the reference value of the parameter 'ETA_PILOTAGE' is equal to 1.

The calculations were stopped when the value of parameter ETA_PILOTAGE stabilized.

The reference being taken with respect to the beam solution with 50 elements, we observe an improvement in 3D shell results QUAD9 when the mesh is refined.