Features and verification
===============================

The law of HUJEUX (HUJEUX behavior for the COMPORTEMENT keyword) can be used in*Code_Aster* with different models:


* classic version: 3D, D_ PLAN,


* sub-integrated finite elements: 3D_SI, D_ PLAN_SI,


* combined with the models from THM (cf. [:external:ref:`R7.01.11 <R7.01.11>`]): 3D_ HMD, D_ PLAN_HMD...

The HUJEUX model can also be used in*Code_Aster* with various types of integration schemes (ALGO_INTE): 'NEWTON', 'NEWTON_RELI', 'NEWTON_PERT', 'SEMI_EXPLICITE', '', 'BASCULE_EXPLICITE', 'SPECIFIQUE'.

Attention:

The validity of the 3D formulation of the Hujeux law seems questionable (cf. **Appendix 3**). It is therefore necessary to adopt a certain degree of caution when using it in this context.

Here is the list of available validation cases:

.. csv-table::

    "ssnv197abcd", "[:external:ref:`V6.04.197 <V6.04.197>`]", "drained triaxial test (pure mechanics) with Hujeux's law; 2 pre-consolidation pressures: 50 and 200 kPa and introduction of parameters to allow a comparison with *Gefdyn*. Test case SSNV197D is treated with a rotation of the local coordinate system by :math:`45°` with respect to the vertical (loading direction). The solution obtained is compared to a calculation where the mesh is rotated."
    "ssnv204abc", "[:external:ref:`V6.04.204 <V6.04.204>`]", "drained consolidation test (pure mechanics) with Hujeux's law; interest: testing the consolidation then the cyclic under representative "pure mechanical" conditions. SSNV204b: isotropic compression of an orthotropic elastic material. We degenerate the Hujeux law into an orthotropic elastic law, and we validate the spherical terms of the orthotropic Hooke tensor with respect to a true elastic calculation. SSNV204c: a purely isotropic loading is carried out leading to the traction of the ground. The activation of plastic traction mechanisms is thus validated."
    "ssnv205a", "[:external:ref:`V6.04.205 <V6.04.205>`]", "deformation-controlled drained cyclic shear test. Interest: to test the cyclic under representative "pure mechanical" conditions. Comparison with*Gefdyn*."
    "ssnv207a", "[:external:ref:`V6.04.207 <V6.04.207>`]", "stress-controlled cyclic shear with microdischarge."
    "ssnv208a", "[:external:ref:`V6.04.208 <V6.04.208>`]", "Biaxial test case under drained conditions on dense Hostun sand (D_ PLAN). Calculation during post-processing of the Rice criterion. (option INDL_ELGA)"
    "ssnv210ab", "[:external:ref:`V6.04.210 <V6.04.210>`]", "Monotonous shear test drained in D_ PLANet 3D in order to validate the shear terms of the orthotropic Hooke tensor."
    "wtnv132ab", "[:external:ref:`V7.31.132 <V7.31.132>`]", "Construction test by layers under drained "pure mechanical" conditions with Hujeux's law. WTNV132b: Simulation identical to the previous one overloaded with a D_ PLAN_DIL modeling. WTNV132c: Simulation identical to modeling A with an overall resolution in secant matrix. WTNV132d: Simulation identical to modeling A with modeling D_ PLAN_HM_SI. WTNV132e: Simulation identical to C modeling with D_ PLAN_HM_SI modeling."
    "wtnv133abc", "[:external:ref:`V7.31.133 <V7.31.133>`]", "triaxial test in non-drained conditions with Hujeux's law; interest: to test the consolidation and then the cyclic under representative hydromechanical conditions."
    "wtnv134ab", "[:external:ref:`V7.31.134 <V7.31.134>`]", "triaxial test under hydromechanical cyclic undrained conditions. Comparison with*Gefdyn*. WTNV134b: identical load applied using the SIMU_POINT_MAT operator"
    "WDNP101abcd ", "[:external:ref:`V7.34.101 <V7.34.101>`]", "seismic solicitation of a construction by layers with Hujeux's law, modeling D_ PLAN_HM. WDNP101b: Simulation identical on a physical basis and not modal as the previous case. WDNP101C, D: Problem that is unsized and uses models D_ PLAN_HM_SIet 3D_ HM_SI"