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


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

The shell is modeled by DKT elements. Its characteristics are defined in AFFE_CARA_ELEM:


* thickness: :math:`16\times 0.28=4.48m`


* shell reference frame defined by ANGL_REP = 0.

The various layers are defined by the operator DEFI_COMPOSITE which gives for each layer its thickness, material and orientation with respect to the reference frame defined in AFFE_CARA_ELEM.


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

Number of knots:624

Number of meshes and types: 48 SEG2 and 576 QUA4


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

For the 0° diaper


.. csv-table::

    "**Identification**", "**Reference type**", "**Reference**", "**% tolerance**"
    ":math:`{\sigma }_{\mathrm{xx}}` "," SOURCE_EXTERNE ", "-242", "0.5"
    ":math:`{\sigma }_{\mathrm{yy}}` "," SOURCE_EXTERNE ", "67", "0.6"


For the 45° diaper


.. csv-table::

    "**Identification**", "**Reference type**", "**Reference**", "**% difference**"
    ":math:`{\sigma }_{\mathrm{xx}}` "," SOURCE_EXTERNE ", "-108", "0.5"
    ":math:`{\sigma }_{\mathrm{yy}}` "," SOURCE_EXTERNE ", "-67", "0.6"