4. Nonlinear possibilities#

4.1. Law of behavior#

All the relationships in plane constraints, usable under COMPORTEMENT in STAT_NON_LINE, and DYNA_NON_LINE are available (cf. [U4.51.11]).

4.2. Deformations#

The available deformations, used in behavioral relationships under the keyword DEFORMATION for the operators STAT_NON_LINE and DYNA_NON_LINE are (Cf. [U4.51.11]):

/”PETIT”

The deformations used for the behavioral relationship are the linearized deformations.

/”PETIT_REAC”

The deformation increments used in the incremental behavior relationship are the linearized deformations of the displacement increment in the updated geometry.

/”GROT_GDEP”

Allows calculations to be carried out in large movements and in large rotations. The deformations used in the behavioral relationship are the deformations of GREEN - LAGRANGE.

Note:

  1. Attention, calculating deformations using “PETIT_REAC” is only an approximation of the hypotheses of large displacements. It requires very small loading increments. To correctly take into account large movements, and especially large rotations, it is recommended to use DEFORMATION =” GROT_GDEP “ .

  2. It is possible by using under the keyword factor * EXCIT (TYPE_CHARGE =” SUIV “) to take into account a subsequent pressure.