.. _R5.03.20:

**r5.03.20** Nonlinear elastic behavior relationship under large displacements
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**Summary:**

It is proposed to describe here a non-linear elastic behavior relationship that coincides with the Hencky-vonMises elastoplastic law (isotropic work hardening) in the case of a load that induces a radial and monotonic evolution of the stresses at any point of the structure. This model is chosen in command STAT_NON_LINE using the keyword RELATION =' ELAS_VMIS_LINE 'or' ELAS_VMIS_TRAC 'under the keyword factor COMPORTEMENT.

This behavioral relationship is then extended to large displacements and rotations, insofar as it derives from a potential (hyperelastic law); this functionality is chosen through the keyword DEFORMATION =' GROT_GDEP '. It is available for all 2D and 3D isoparametric elements.




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    Relation_de_comportement__lastique_non_lin_aire___ELAS_VMIS_LINE_et_ELAS_VMIS_TRAC
    _lasticit__en_grandes_transformations
    Bibliographie
    Description_des_versions_du_document