3. Operands#
3.1. Operand LIST_PARA#
♦ LIST_PARA
/”M”, /”SIGM_REFE”,
List of Weibull model parameters that need to be adjusted (\(m\), \({\sigma }_{u}\), or both).
3.2. Keyword RESU#
3.2.1. Operand EVOL_NOLI#
♦ EVOL_NOLI = resu,
Name of a result concept of type evol_noli.
3.2.2. Operand MODELE#
♦ MODELE = me,
Name of the model on which the recalibration is performed.
3.2.3. Operand CHAM_MATER#
♦ CHAM_MATER = chmat,
The name of the material field assigned to the model. This must contain the initial value of the parameters of the Weibull method (keyword WEIBULL of DEFI_MATERIAU [U4.43.01]), namely:
\({V}_{0}\) |
: reference volume |
\(m\) |
: exponent of the Weibull statistical distribution |
\({\sigma }_{u}\) |
: cleavage constraint |
3.2.4. Operand TEMPE#
◊ TEMPE = time,
Temperature associated with the resu result. If this is entered, the cleavage constraint \({\sigma }_{u}\) will be reset for each result.
3.2.5. Operand LIST_INST_RUPT#
♦ LIST_INST_RUPT = lreel,
List of the moments of rupture of the resu result base on which the Weibull constraints will be calculated (these moments are interpolated if they do not coincide with the moments of the resu result). This list of moments must be strictly increasing and contain at least two moments. The minimum instant (respectively maximum) of this list must of course be greater than (resp. lower) than the minimum instant (resp. maximum) of the list of times of the resu result.
3.2.6. Operands TOUT/GROUP_MA#
The calculation domain (s) are specified by:
♦/TOUT = 'OUI',
A single domain is defined and it coincides with the whole structure.
/GROUP_MA = lgrma,
Each group of elements in the lgrma list defines a calculation domain.
3.2.7. Operands TOUT_ORDRE/NUME_ORDRE/INST/LIST_INST//PRECISION/CRITERE#
# selection of the calculation times in which we want to interpolate the Weibull constraints at the times given by LIST_INST_RUPT
see TOUT_ORDRE, NUME_ORDRE, LIST_ORDRE, INST, LIST_INST in [U4.71.00]
Aster first computes the Weibull constraints for all the times given by TOUT_ORDRE/NUME_ORDRE//INST/LIST_INST, he then interpolates the Weibull constraints at the times given by LIST_INST_RUPT.
3.2.8. Operand COEF_MULT#
◊ COEF_MULT = key,
Multiplying coefficient of the m-th power of the Weibull constraint intended to take into account symmetries in the domain (the default value is 1. cf. POST_ELEM [U4.81.22]).
3.3. Operand OPTION#
/OPTION = 'SIGM_ELGA',
The elementary field of the maximum principal stress is calculated from the representation of the stress field at Gauss points.
/OPTION = 'SIGM_ELMOY',
The elementary field of the maximum principal stress is calculated from the representation of the stress field averaged with respect to the Gauss points.
3.4. Operand CORR_PLAST#
/CORR_PLAST = 'OUI',
The Weibull stress field is evaluated with the plastic correction.
/CORR_PLAST = 'NON',
The Weibull stress field is evaluated without plastic correction.
3.5. Operand METHODE#
/METHODE = 'MAXI_VRAI',
The calibration method used is that of maximum likelihood.
/METHODE = 'REGR_LINE',
The calibration method used is that of linear regression.
3.6. Keyword INCO_GLOB_RELA#
◊ INCO_GLOB_RELA =/increl, [R]
/1.E-3, [DEFAUT]
The recalibration algorithm continues iterations if:
\(\mathrm{max}(∣\frac{{m}_{k+1}-{m}_{k}}{{m}_{k}}∣;\underset{T}{\mathrm{max}}(∣\frac{{\sigma }_{u(k+1)}(T)-{\sigma }_{u(k)}(T)}{{\sigma }_{u(k)}(T)}∣))>\mathrm{increl}\)
3.7. Keyword ITER_GLOB_MAXI#
◊ ITER_GLOB_MAXI =/maglob, [R]
/10, [DEFAUT]
Maximum number of readjustment iterations performed.
3.8. Operand INFO#
◊ INFO =
Indicates the level of printing of operator results,
1: |
no impression, |
2: |
printing registration information. |
The prints are done in the file “MESSAGE”.