Operands
====


Operands MODELE/CHAM_MATER/CARA_ELEM
----

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


.. code-block:: text

    ♦ MODELE = me,

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


.. code-block:: text

    ♦ CHAM_MATER = chmat,

Material field name.


.. code-block:: text

    ◊ CARA_ELEM = character,

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


Keyword EXCIT
----

Boundary conditions and loads are defined here.


.. code-block:: text

    ◊ 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.


Operands CHARGE/FONC_MULT
~~~~


.. code-block:: text
♦    CHARGE= char,

Name of a char_meca concept produced by AFFE_CHAR_MECA or AFFE_CHAR_MECA_F [:external:ref:`U4.44.01 <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 [:external:ref:`U4.44.03 <U4.44.03>`].


.. code-block:: text
◊    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.


Tags INST/LIST_INST
----


.. code-block:: text

    ◊/INST = tps,

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

.. code-block:: text
/    LIST_INST= litps,


.. code-block:: text
◊    INST_FIN= tf,

The litps list produced by DEFI_LIST_REEL [:external:ref:`U4.34.01 <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:


.. code-block:: text

    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.,...)


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.


Keyword factor SOLVEUR
----

See [:ref:`U4.50.01 <U4.50.01>`].


Operand OPTION
----


.. code-block:: text

    ◊ 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 [:external:ref:`U4.81.04 <U4.81.04>`] command.

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


Operand INFO
----


.. code-block:: text

    ◊ INFO = 1,

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


Operand TITRE
----


.. code-block:: text

    ◊ TITRE = title,

Title we want to give to the result [:external:ref:`U4.03.01 <U4.03.01>`].