B modeling
==============

Characteristics of modeling
-----------------------------------

3D discretization of the beam with element HEXA8. Beam-wall contact is modelled by DEFI_CONTACT using the active stress method.

The initial conditions and the boundary conditions are imposed through groups of nodes:


.. csv-table::

    "PAROI ", "(embedding the lower nodes of the contact element)"
    "PLANSYMX ", "(symmetry conditions according to :math:`x`)"
    "PLANSYMY ", "(symmetry conditions according to :math:`y`)"
    "NOBARRE ", "(initial movements and speeds)."


     The schema parameters for NEWMARK are:


.. csv-table::

    "ALPHA = 0.28"
    "DELTA = 0.55"



Characteristics of the mesh
----------------------------

Number of knots: 88

Number of meshes and types: 21 HEXA8