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<a name = "hj-top"> </a><table class = "table1" id = "table11"><tr><td><table class = "DocHeader"><tr><td class = "DocHeader1" colspan = "2"><h1>Defining Symmetry Conditions</h1></td></tr><tr><td class = "DocHeader4" colspan = "2"/></tr><tr><td class = "DocHeader3" colspan = "2"><table class = "DocThemeIntro" id = "table12"><tr><td class = "Intro1Only"><p class = "header"><p class = "abstract">
<span class = "shortdesc">
Different symmetry conditions can be defined for an optimization
in <span class = "ph">SIMULIA Tosca Structure</span>.
They can be used for obtaining symmetrical results using nonsymmetrical
meshes, saving the processing time for the FE-calculation. In addition,
symmetrical <span class = "ph">load case</span>
can often be reduced in the FE model.
</span>

</p>
<p>This task shows you how to:
					</p><ul><li><a href = "#tso-t-usr-sizing-manuCond-symCond-gui" id = "toc_rg" title = "">
Define the Symmetry Condition in <span class = "ph">Tosca Structure.gui</span>
</a></li><li><a href = "#tso-t-usr-sizing-manuCond-symCond-parFile" id = "toc_rg" title = "">Parameter File</a></li></ul>
</p></td></tr></table></td></tr></table>




<div class = "body taskbody">
<div class = "section context"><p class = "context"><span class = "run-in.context">Context: </span>
<p>
The following symmetry conditions are available with <span class = "ph">SIMULIA Tosca Structure</span>:
</p>
<ul class = "ul">
<li class = "li">reflection symmetry</li>
<li class = "li">point symmetry</li>
<li class = "li">rotational symmetry</li>
<li class = "li">
cyclic translational symmetry (replication of an area with a given
distance)
</li>
<li class = "li">link condition (coupling of arbitrary areas of the model)</li>
</ul>
<p>The following figures show a beam without symmetry (left) and with reflection symmetry (right).</p>
<table class = "table" id = "tso-t-usr-sizing-manuCond-symCond__aa746721"><caption/><colgroup><col/></colgroup><tbody class = "tbody">
<tr class = "row">
<td class = "entry">
<br/><img class = "image" src = "../TsoUserImages/aa0b64e4.jpg" width = "450"/><br/>
</td>
</tr>
</tbody></table>
<p>Example of rotational symmetry (left) and cyclic translational symmetry (right) is presented below.</p>
<table class = "table"><caption/><colgroup><col/></colgroup><tbody class = "tbody">
<tr class = "row">
<td class = "entry">
<br/><img class = "image" src = "../TsoUserImages/aa0b64ea.jpg" width = "450"/><br/>
</td>
</tr>
</tbody></table>
</p></div>

</div>


<article class = "topic task nested1" aria-labelledby = "ariaid-title2" id = "tso-t-usr-sizing-manuCond-symCond-gui">
<h2 class = "title topictitle2">
Define the Symmetry Condition in <span class = "ph">Tosca Structure.gui</span>
</h2>

<div class = "body taskbody">
<section><ol class = "ol steps"><li class = "li step stepexpand">

Choose <span class = "ph uicontrol">Command | LINK_SIZING</span>  in <span class = "ph">Tosca Structure.pre</span>
screen.

</li><li class = "li step stepexpand">

In the LINK_SIZING dialog, define the
type of symmetry, the coordinate system and, if necessary, the rotation
angle (in case of rotation symmetry) or the translation distance (in
case of cyclic symmetry). The symmetry definition can also be extended
to frozen areas by selecting the corresponding checkbox.

<p>
The frozen elements of one area are also considered as frozen for
the linked areas, if the <code class = "ph codeph">Frozen</code> checkbox is checked.
</p>
</li><li class = "li step stepexpand">

Choose <span class = "ph uicontrol">Command | DVCON_SIZING</span>.

</li><li class = "li step stepexpand">

In the DVCON_SIZING dialog, apply the defined symmetry condition  as <span class = "ph uicontrol">Type = Link Sizing</span>. <br/><img class = "image" src = "../TsoUserImages/aa0b6517.jpg" width = "450"/><br/>

</li></ol></section>
</div>

</article>

<article class = "topic task nested1" aria-labelledby = "ariaid-title3" id = "tso-t-usr-sizing-manuCond-symCond-parFile">
<p><map name = "FPMap1"><area href = "#hj-top" title = "Back to Top" shape = "rect" coords = "416, 0, 435, 10"/></map><span class = "itemsprite"/></p><h2 class = "title topictitle2">Parameter File</h2>

<div class = "body taskbody">
<section><div class = "li step p">
The resulting command looks like:
<div class = "itemgroup stepresult">
<pre class = "codeblock">
<code class = "ph codeph">
LINK_SIZING
 ID_NAME     = &lt;Name of LINK_SIZING object&gt;
 CS          = &lt;Name of the reference coordinate system&gt;
 TYPE        = &lt;Type of symmetry&gt;, &lt;axis&gt;
 TRANSLATION = &lt;Translation for cyclic symmetry&gt;
 ANGLE       = &lt;Segment angle for rotation symmetry&gt;
END_
</code>
</pre>

<pre class = "codeblock">
<code class = "ph codeph">
DVCON_SIZING
 ID_NAME    = &lt;Name of DVCON_SIZING object&gt;
 EL_GROUP   = &lt;Element group to be restricted&gt;
 CHECK_TYPE = LINK_SIZING
 CHECK_LINK = &lt;Name of LINK_SIZING definition&gt;
END_
</code>
</pre>
<p>
More than one symmetry condition can be defined for an element group.
Geometrically, different combinations must be feasible.
</p>
<p>
<table class = "Remark" id = "table132"><tr><td class = "Remark"><span class = "run-in.important">Important:
				</span><span class = "notecontent">
The FE meshes do not must be symmetric. The restriction can also
be applied to unstructured meshes or to tetrahedron meshes. The elements
should have nearly the same size because the result is the resolution
of the coarsest part of the mesh. It is possible that the linked elements
are not determined correctly if the size of the elements differs too
much.
</span></td></tr></table>

</p>
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</article>

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