Modeling A
==============


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

**3D Modeling**: **

Elementary cube meshed using a hexahedron with 8 knots.


.. image:: images/10000CCA000025D4000018E84EDB90D5AC7370F7.svg
    :width: 488
    :height: 321


.. _RefImage_10000CCA000025D4000018E84EDB90D5AC7370F7.svg:


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

1 HEXA8 stitch, side width :math:`a=1`.


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


+-----------------------------------------------------------------------------------+-------------+---------+----------------+
|**Identification**                                                                 |**Reference**|**Aster**|**% difference**|
+-----------------------------------------------------------------------------------+-------------+---------+----------------+
|In all knots                                                                       |             |         |                |
+-----------------------------------------------------------------------------------+-------------+---------+----------------+
|:math:`\mathrm{\epsilon }`                                                         |2.10-5       |2.10-5   |0               |
+-----------------------------------------------------------------------------------+-------------+---------+----------------+
|:math:`\mathrm{\gamma }`                                                           |2.610-5      |2.610-5  |0               |
+-----------------------------------------------------------------------------------+-------------+---------+----------------+
|:math:`{\mathrm{\epsilon }}_{p}`                                                   |             |         |0               |
+-----------------------------------------------------------------------------------+-------------+---------+----------------+
|:math:`{\mathrm{\gamma }}_{p}`                                                     |0            |0        |0               |
+-----------------------------------------------------------------------------------+-------------+---------+----------------+
|                                                                                   |0            |0        |0               |
+ .. image:: images/Object_8.svg                                                    +             +         +                +
|    :width: 488                                                                    |             |         |                |
+    :height: 321                                                                   +             +         +                +
|                                                                                   |             |         |                |
+                                                                                   +             +         +                +
|                                                                                   |             |         |                |
+-----------------------------------------------------------------------------------+-------------+---------+----------------+
|:math:`{\mathrm{\sigma }}_{p}`                                                     |64.8         |64.8     |0               |
+-----------------------------------------------------------------------------------+-------------+---------+----------------+


The test also validates the reading of field EPSP_ELNO by LIRE_RESU, we check that we have the same values before and after writing/reading the result:


.. csv-table::

    "**Identification**", "**Reference**", "**Reference type**", "**Tolerance**"
    "Mesh MA1, Knot NO1, Field EPSP_ELNO, Field, Cmp EPXX, Cmp," Inst2,", "-", "'NON_REGRESSION'", "-"



notes
---------

The charge used here does not cause plasticization, whereas without viscosity, this same load leads the structure into an elastoplastic regime.

The test concerning the value :math:`{\sigma }_{p}` does not give exactly the same value on all machines (TOLE_MACHINE needed). This problem is linked to a function having a vertical tangent (power 0.3) that appears in the law of behavior. See the comment in the ssnv200a.comm file.