4. Nonlinear possibilities

4.1. Laws of behavior

The laws of behavior specific to these models, which can be used under COMPORTEMENT in STAT_NON_LINE and DYNA_NON_LINE, are as follows (Cf. [U4.51.11]):

/ “ VMIS_CINE_LINE “

Supported modeling: POU_D_TGM

/ “ VMIS_ISOT_LINE “

Supported modeling: POU_D_TGM

/ “ VMIS_ISOT_TRAC “

Supported modeling: POU_D_TGM

/ “ GRAN_IRRA_LOG “

Supported modeling: POU_D_TGM

Note:

It is also possible for these models using a one-dimensional state of constraints to use 3D behaviors (thanks to the De Borst method [R5.03.03]).

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.

Note:

Attention, calculating deformations using PETIT_REAC is only an approximation of the hypothesis 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 POU_D_T_GD.