C modeling
==============


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

Shell element MEC3TR7H


.. image:: images/100006BA00000BFD00000C32DB96E852A214E01E.svg
    :width: 154
    :height: 157


.. _RefImage_100006BA00000BFD00000C32DB96E852A214E01E.svg:

Modeling an eighth of a plate

Die-cutting:

10 on :math:`\mathrm{AD}` and :math:`\mathrm{BC}`

18 on :math:`\mathrm{AB}` and :math:`\mathrm{DC}`: 360 stitches TRIA7

Boundary conditions:


.. csv-table::

    "in all the nodes of:", "DDL_IMPO:"
    "arc (:math:`\mathrm{AB}`)", "(GROUP_NO: AB DX: 0., DY: 0., DRZ: 0.)"
    "arc (:math:`\mathrm{CD}`)", "(GROUP_NO: CD DZ: 0., DRX: 0., DRY: 0.)"
    "segment) :math:`\mathrm{BC}` (", "(GROUP_NO: BCsansBC DX: 0., DRY: 0., DRZ: 0.)"
    "segment) :math:`\mathrm{AD}` (", "(GROUP_NO: ADsansAD DY: 0., DRX: 0., DRZ: 0.)"
    "in :math:`C` ", "(GROUP_NO: C DX: 0., DRZ: 0.)"
    "in :math:`D` ", "(GROUP_NO: D DY: 0., DRZ: 0.)"
    "", ""
    "Loading:", ""
    "", ""
    "at node :math:`C`:", "(GROUP_NO: C FY: -0.25)"


Node names:


.. csv-table::

    "Point :math:`A` "," :math:`\mathrm{N01}`"
    "Point :math:`B` "," :math:`\mathrm{N02}`"
    "Point :math:`C` "," :math:`\mathrm{N03}`"
    "Point :math:`D` "," :math:`\mathrm{N04}`"



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

Number of knots: 777

Number of meshes and types: 360 TRIA7


Tested values
---------------


.. csv-table::

    "**Identification**", "**Reference**"
    "Point :math:`C`
    displacement :math:`v` ", "—1.8248 10—5"



notes
---------

For a mesh with 500 TRIA7 and 1071 knots (division 10 on :math:`\mathrm{AD}` and :math:`\mathrm{BC}`, 25 on :math:`\mathrm{AB}` and :math:`\mathrm{DC}`), we get a displacement :math:`v` at the point :math:`C` of —1.7723 10—5. The relative error on the :math:`v` move in :math:`C` is then 2.88%. The results with this element for light meshes is therefore not very good and improves relatively little with an increase in the number of meshes.