Modeling A
==============


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

The bi-supported structure of length :math:`\mathrm{0,25}m`, extending between :math:`Z=-\mathrm{0,1}m` and :math:`Z=\mathrm{0,15}m`, is connected at the levels of the nodes at positions :math:`\mathrm{0,0}m` and :math:`\mathrm{0,05}m` to a 3D model by the 3D_ POU option of the LIAISON_ELEM keyword from AFFE_CHAR_MECA.

It is modelled by Timoshenko beam elements (POU_D_T) and quadratic solid elements (PENTA15 and HEXA20).


.. image:: images/10000200000004B5000001D8F3159758216CC258.png
    :width: 2.9091in
    :height: 1.3154in


.. _RefImage_10000200000004B5000001D8F3159758216CC258.png:

Image 3.1-1:3D solid model mesh

DYNA_LINE_TRAN calculates the dynamic response of the structure for 3 s, due to a nodal force of a value equal to 100 N on the 3D mesh node located at :math:`Z=\mathrm{0,02}m`. The switch from the 1D model to the 1D-3D mixed model is done at the moment :math:`\mathit{Tb}=2s`.


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


.. csv-table::

    "Number of stitches HEXA20 ", "150"
    "Number of stitches PENTA15 ", "50"
    "Number of stitches POU_D_T ", "20"


**Table** 3.2-1


Tested sizes and results
------------------------------

The tables below give the numerical values tested in this test case. These are the minimum and maximum movements in X of a 3D mesh node located at :math:`Z=\mathrm{0,04}m`.


.. csv-table::

    "**Identification**", "**Maximum Time**", "**Reference Type**", "**Reference Value**", "**Tolerance**"
    "Minimal X displacement", "2.2115 s", "'AUTRE_ASTER'", "-0.0003266"," 7.00%"
    "Maximum X displacement", "2.7065 s", "'AUTRE_ASTER'", "+0.0003264"," 7.00%"


**Table** 3.3-1 **: Summary of tested results**