3. B modeling#
3.1. 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:
CIBLE = DEFI_FONCTION (
NOM_PARA =' INST ',
NOM_RESU ='DZ',
VALE = (0.0, 0.0,
1.0, F_ RESULT,),
)
The call to the recalibration command:
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:
REACF = POST_RELEVE_T (
ACTION =_F (INTITULE =' FZ_CEG ',
OPERATION =' EXTRACTION ',
RESULTAT = RESU,
NOM_CHAM =' REAC_NODA ',
RESULTANTE ='DZ',
GROUP_NO ='N_ SCEG ',),
)
3.2. Tested sizes and results#
The realignment carried out makes it possible to determine a value of DEPL_R_ close to \(8.0E-3\mathit{mm}\). This value makes it possible to put the stud under tension with an average stress of \(30\mathit{MPa}\) 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.
Result |
Reference |
Reference Value |
Tolerance |
Resulting force on the nut |
non- regression |
\(0.0079595\) |
|
Note: in the slave file a printout reacf is made. The effort value corresponding to the parameter is \(\mathrm{-}1.69560E+03\) * , which corresponds to the target effort value.