3. Generalities

These two commands create char_cine_* (_meca/_ther) concepts.

The AFFE_CHAR_CINE command can also create char_cine_acou concepts.

These types are different from the load type created by the AFFE_CHAR_MECA [U4.44.01], AFFE_CHAR_THER [U4.44.02], or AFFE_CHAR_ACOU [U4.44.04]) commands.

The objects created are therefore not interchangeable.

The advantage of « kinematic » loads is that they do not increase the number of system unknowns to be solved, unlike the method of dualization by multipliers in LAGRANGE, used in commands that produce a load-like concept.

On the other hand, the use of these charges has the following limitations:

• they can only be used in the case of an « imposed ddl » relationship (and not for linear relationships),

• these charges are not yet accepted in all global orders. Today the possible orders are:

  • MECA_STATIQUE, STAT_NON_LINE, DYNA_NON_LINE

  • THER_LINEAIRE

• for a calculation that does not use global commands: assembling a matrix, then solving, the sequence of commands to use is more complicated than with « ordinary » loads as can be seen in example 2 [§ 5.2].