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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>Minimizing Contact Pressure </h1></td></tr><tr><td class = "DocHeader4" colspan = "2"/></tr><tr><td class = "DocHeader3" colspan = "2"><table class = "DocThemeIntro" id = "table12"><tr><td class = "Intro1"><p class = "header"><p class = "abstract">
<span class = "shortdesc">
Another special usage of <span class = "ph">Tosca Structure.shape</span>
controller algorithm is the optimization of contact zones. Here it is
important to understand that the normal shape optimization must be
reversed because growth in a contact zones
will result in a higher contact pressure and shrinkage in a lower. This
is done by changing the setting <span class = "ph">SCALE</span> in <code class = "ph codeph">OPT_PARAM</code>
to a negative value, usually a small negative value, for example, -0.001.
</span>

</p>
<p>This task shows you how to:
					</p><ul><li><a href = "#tso-t-usr-shape-advanced-contact-gui" id = "toc_rg" title = "">
Optimize Contact Zones in<span class = "ph">Tosca Structure.gui</span>
</a></li><li><a href = "#tso-t-usr-shape-advanced-contact-parFile" id = "toc_rg" title = "">
<span class = "ph">Tosca Structure</span>
Parameter File
</a></li></ul>
</p></td></tr><tr><td class = "Intro2"><hr class = "header"/><span class = "run-in-beforeyoubegin">Before you begin: </span>
<p>
The <span class = "ph">Tosca Structure.shape</span>
optimization of contact zones only works within the contact zone where
small changes in the contact surface usually have a big influence on the
contact pressure. This is the reason for a small <code class = "ph codeph">SCALE</code>
value.
</p>
<p>
The <code class = "ph codeph">CONTACT_PRESSURE</code> design responses are currently
only supported by <span class = "ph">Abaqus</span>.
</p>
</td></tr></table></td></tr></table>





<div class = "body taskbody">
<div class = "p"><!--xxx--></div>

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<article class = "topic task nested1" aria-labelledby = "ariaid-title2" id = "tso-t-usr-shape-advanced-contact-gui">
<h2 class = "title topictitle2">
Optimize Contact Zones 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 menucascade"><span class = "ph uicontrol">Command</span><abbr title = "and then"> &gt; </abbr><span class = "ph uicontrol">DRESP</span></span>.

<div class = "itemgroup stepresult">The DRESP menu appears.</div>
</li><li class = "li step stepexpand">

Define the <span class = "ph uicontrol">SIG_CONTACT_PRESSURE</span>
as design response as shown in the following figure:<br/><img class = "image" id = "tso-t-usr-shape-advanced-contact-gui__image_A7941B455E264EE9BDADB7644D5BD5E7" src = "../TsoUserImages/shape_contact_pressure_gui.png" width = "450"/><br/>

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

Define the Optimization Parameters in the OPT_PARAM dialog as shown in the following figure:<br/><img class = "image" id = "tso-t-usr-shape-advanced-contact-gui__image_87B0503BDECB451B945B67210A282B68" src = "../TsoUserImages/shape_opt_param_scale_gui.png" width = "450"/><br/>

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

</article>

<article class = "topic task nested1" aria-labelledby = "ariaid-title3" id = "tso-t-usr-shape-advanced-contact-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">
<span class = "ph">Tosca Structure</span>
Parameter File
</h2>

<div class = "body taskbody">
<section><div class = "li step p">

The resulting command in the parameter file look like
follows:

<p>

<pre class = "codeblock">
<code class = "ph codeph">
DRESP
 ID_NAME        = MY_DRESP
 DEF_TYPE       = SYSTEM
 TYPE           = SIG_CONTACT_PRESSURE
 ND_GROUP       = DESIGN_NODES
 LC_SET         = ALL,1,All
 GROUP_OPER     = Max
END_

OPT_PARAM
 ID_NAME        = MY_PARAMETERS
 OPTIMIZE       = MY_OPTIMIZATION_TASK
 SCALE          = -0.001
END_
</code>
</pre>
</p>
</div></section>
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</article>
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