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

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

This modeling illustrates the methodology for tightening a stud by automatically adjusting the value of the relative displacement between the nodes of the nut and the stud. To do this, the macro command MACR_RECAL is used in a master file and the modeling A is used as a slave file.

The function of the target effort to be achieved:

.. code-block:: text

    CIBLE = DEFI_FONCTION (

    NOM_PARA =' INST ',

    NOM_RESU ='DZ',

    VALE = (0.0, 0.0,

    1.0, F_ RESULT,),

    )

The call to the recalibration command:

.. code-block:: text

    RECAL = MACR_RECAL (

    PARA_OPTI = _F (NOM_PARA =' DEPL_R__ ',

    VALE_INI = 0.004, VALE_MIN = 0.004, VALE_MAX = 0.012,),

    COURBE = _F (FONC_EXP = CIBLE, NOM_FONC_CALC =' REACF ',

    PARA_X =' INST ', PARA_Y ='DZ'),

    )

In the slave file the reacf calculation:

.. code-block:: text

    REACF = POST_RELEVE_T (

    ACTION =_F (INTITULE =' FZ_CEG ',

    OPERATION =' EXTRACTION ',

    RESULTAT = RESU,

    NOM_CHAM =' REAC_NODA ',

    RESULTANTE ='DZ',

    GROUP_NO ='N_ SCEG ',),

    )


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

The realignment carried out makes it possible to determine a value of DEPL_R_ close to :math:`8.0E-3\mathit{mm}`. This value makes it possible to put the stud under tension with an average stress of :math:`30\mathit{MPa}` in its shaft.

The only quantity that can be retrieved in concept MARC_RECAL is the value of the parameter. The test_result is therefore carried out on this value, and it is a non-regression test.


.. csv-table::

    "**Result**", "**Reference**", "**Reference Value**", "**Tolerance**"
    "Resulting force on the nut", "non- regression", ":math:`0.0079595` "," :math:`5.0E-06`"


*Note: in the slave file a printout* *reacf is made. The effort value corresponding to the parameter is* :math:`\mathrm{-}1.69560E+03` * *, which corresponds to the target effort value.*