3. Operands#

3.1. Operands MODELE/CHAM_MATER/CARA_ELEM#

The arguments for calculating the stiffness matrix (and the second member) are provided:

♦ MODELE = me,

Name of the model whose elements are the subject of mechanical calculation.

♦ CHAM_MATER = chmat,

Material field name.

◊ CARA_ELEM = character,

Name of the characteristics of the structural elements (beam, shell, discrete,…) if they are used in the model.

3.2. Keyword EXCIT#

Boundary conditions and loads are defined here.

◊ EXCIT =

This factor keyword makes it possible to define several load concepts, one per occurrence; the solution is calculated by superimposing the effects of the various loads applied.

3.2.1. Operands CHARGE/FONC_MULT#

♦ CHARGE= char,

Name of a char_meca concept produced by AFFE_CHAR_MECA or AFFE_CHAR_MECA_F [U4.44.01] from the mo model.

We can also give the name of a « kinematic load » (type char_cine_meca) resulting from the operators AFFE_CHAR_CINE and AFFE_CHAR_CINE_F [U4.44.03].

◊ FONC_MULT= fmult,

Name of a function (or formula) concept that makes it possible to define, for each moment of calculation, a multiplier coefficient applied to the char load.

fmult is a function of time: by default it is a constant function that is equal to 1.

3.3. Tags INST/LIST_INST#

◊/INST = tps,

Keyword used to perform the calculation at a single time tps with the temperature corresponding to that instant.

/ LIST_INST= litps,

◊ INST_FIN= tf,

The litps list produced by DEFI_LIST_REEL [U4.34.01] defines the moments for which we ask to calculate a thermo-mechanical evolution.

The keyword INST_FIN makes it possible to calculate only the moments prior to or equal to tf.

This key word (INST_FIN) combined with the keyword « RESULTAT » (reentering command) makes it possible to split a long thermo-mechanical transition.

For example, we will do:

resu = MECA_STATIQUE (... LIST_INST = linst, INST_FIN = 10.,...)

MECA_STATIQUE (RESULTAT = resu, LIST_INST = linst, INST_FIN = 20.,...)

MECA_STATIQUE (RESULTAT = resu, LIST_INST = linst, INST_FIN = 30.,...)

3.4. Keyword RESULTAT#

In the case where you want to continue a calculation that has already been executed, RESULTAT indicates which object is enriched. In this case, the command simply does not recalculate the previous times already calculated.

3.5. Keyword factor SOLVEUR#

See [U4.50.01].

3.6. Operand OPTION#

◊ OPTION =/'SANS'/'SIEF_ELGA'

By default the MECA_STATIQUE command calculates the stresses at Gauss points (or generalized forces for structural elements).

The other post-processing options will be calculated afterwards by the CALC_CHAMP [U4.81.04] command.

If the user indicates OPTION = “SANS”, these constraints will not be calculated and the resulting data structure will be smaller.

3.7. Operand INFO#

◊ INFO = 1,

Print out the main characteristics of the linear systems to be solved: number of unknowns, size of the matrix.

3.8. Operand TITRE#

◊ TITRE = title,

Title we want to give to the result [U4.03.01].