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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>Optimizing the Holeplate Model </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">This example illustrates a shape optimization of a hole in a plate placed under biaxial
   tension. Only a quarter of the plate is modeled due to a symmetric configuration. </span>

</p>

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<section><ol class = "ol steps"><li class = "li step stepexpand">
Before you define the FEM_INPUT, fix the nodes on the symmetry edges:
<div class = "itemgroup stepresult">
<pre class = "codeblock">
OPTIONS
 READ_BC = ALL
END_
</pre>
<p>All
defined fixations in the FE model are loaded into <span class = "ph">SIMULIA Tosca Structure</span> during
model loading. </p>
</div>
</li><li class = "li step stepexpand">
To activate the fixation, create a Design Variable Constraint (DVCON_SHAPE):
<div class = "itemgroup stepresult">
<pre class = "codeblock">
DVCON_SHAPE
 ID_NAME  = dvcon_fix_spc
 ND_GROUP = ALL_NODES
 CHECK_BC = YES
END_
</pre>
<p>By activating CHECK_BC = YES all nodes of the ALL_NODES  node group,
which contain fixations in the FE model and which are in the area
MESH_SMOOTH, are restricted in the same degrees of freedom as defined
by the fixations of the analysis model. The parameter FREE_SF = FIX is set
in the command MESH_SMOOTH to avoid any surface changes outside this
area.</p>
</div>
</li></ol></section>
<p class = "result">
<p>By using this definition, all nodes on the surface area of MESH_SMOOTH are
completely fixed. These nodes should also not contain restrictions defined by
DVCON_SHAPE. The result looks as follows:
<br/><img class = "image" src = "../TsoExampleImages/shapeHoleplateResult.png"/><br/></p></p>
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