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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>Node and Element Groups</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">Node and element groups are required to define design variables, constraints, and
      objectives. They are explained within this section.</span>

</p>
<p>This page discusses: </p><ul><li><a href = "#tso-c-usr-solver-abaqus-groups__tso-c-usr-solver-abaqus-groups-example" id = "toc_rg" title = "">Examples</a></li><li><a href = "#tso-c-usr-solver-abaqus-groups__tso-c-usr-solver-abaqus-groups-mat" id = "toc_rg" title = "">Selection of Properties and Materials</a></li></ul>
</p></td></tr></table></td></tr></table>




<div class = "body conbody">
<p>Node and element groups are defined in the <span class = "ph">Abaqus</span> input file as following:</p>
<pre class = "codeblock">
<code class = "ph codeph">
*NSET, NSET = &lt;<span class = "ph">setname</span>&gt;
*NODE, NSET = &lt;<span class = "ph">setname</span>&gt;
*ELSET, ELSET = &lt;<span class = "ph">setname</span>&gt;
*ELEMENT, ELSET = &lt;<span class = "ph">setname</span>&gt;
</code>
</pre>
<p>These groups are loaded from the <span class = "ph">Abaqus</span>
input file during the preprocessing of the optimization execution. These
groups and their group names are available for the definitions applied
in the parameter file along with the groups <code class = "ph codeph">ALL_NODES</code>
and <code class = "ph codeph">ALL_ELEMENTS</code>. If node and element groups with identical
names are defined in the <span class = "ph">Abaqus</span>
input file, the extensions <code class = "ph codeph">_NODE</code> and <code class = "ph codeph">_ELEM</code>
are added to the distinguish group names during importation. This guarantees
that each group is identically identified by <span class = "ph">SIMULIA Tosca Structure</span>.</p>
<p>Blanks in the group name are ignored during the import in <span class = "ph">SIMULIA Tosca Structure</span>.</p>
<p>Generally, the groups that are required for definition of the optimization
area should already be defined in the <span class = "ph">Abaqus</span>
input file and be used in the parameter file without using a redefinition.</p>
<div class = "section" id = "tso-c-usr-solver-abaqus-groups__tso-c-usr-solver-abaqus-groups-example"><h2 class = "title sectiontitle">Examples</h2>

<p>File ex1.inp (group definition in FE input file):</p>
<pre class = "codeblock">
<code class = "ph codeph">
...
*ELSET, ELSET=DESIGN_ELEM, GENERATE
1, 10000, 1
15000, 20000, 1
...
File ex1.par (apply group in parameter file):
...
DV_TOPO
 ID_NAME  = dv_design_elements
 EL_GROUP =<span class = "ph"> design_elem</span>
END_
</code>
</pre>
<p>or </p>
<pre class = "codeblock">
<code class = "ph codeph">
...
*ELSET, ELSET="Design Elements", GENERATE
1, 10000, 1
15000, 20000, 1
...
File ex1.par (apply group in parameter file):
...
DV_TOPO
  ID_NAME  = dv_design_elements
  EL_GROUP =<span class = "ph"> "Design Elements"</span>
END_
</code>
</pre>
</div>

<div class = "section" id = "tso-c-usr-solver-abaqus-groups__tso-c-usr-solver-abaqus-groups-mat"><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 sectiontitle">Selection of Properties and Materials</h2>

<table class = "Remark" id = "table132"><tr><td class = "Remark"><span class = "run-in.important">Important:
				</span><span class = "notecontent"><p>It is impossible to do material or property selection when using <span class = "ph">SIMULIA Tosca Structure</span> in connection with <span class = "ph">Abaqus</span> as properties in <span class = "ph">Abaqus</span> do not have independent names or IDs and these are always assigned to a particular
          element group. Therefore, it is recommended that a selection is based on the assigned
          element group and not on the selection of a property.</p></span></td></tr></table>

<p><span class = "ph">Abaqus</span> assigns material definitions with own names. <span class = "ph">SIMULIA Tosca Structure</span> allocates an ID for the material definition that runs sequential starting with the number
        1. <span class = "ph">SIMULIA Tosca Structure</span> can either select material by name or by ID. However, it is recommended that selection is
        done using a name to avoid any dependency on the position of the definition within the input
        file.</p>
</div>

</div>

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