4. Nonlinear possibilities

For DKT modeling only.

4.1. Law of behavior

Only the “DKT” and “DKTG” models have non-linear possibilities. The laws of behavior specific to this modeling, usable under COMPORTEMENT in STAT_NON_LINE and DYNA_NON_LINE, are the behavior relationships in plane constraints available with the models” AXIS “and “C_ PLAN” (cf. [U4.51.11]).

4.2. Deformations

The available deformations, used in behavioral relationships under the keyword DEFORMATION for 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.

Note:

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 the modeling COQUE_3D, with DEFORMATION =” GROT_GDEP “.