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      <title>CTRIAX</title>
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      <div class="title_refTopic" id="xps10_pagetitle">CTRIAX </div>
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      <h4 class="refClassification">Fully Nonlinear Axisymmetric Element </h4>
      <p class="para_refTopic">Defines an axisymmetric triangular element with up to 6 grid points for use in fully nonlinear (i.e., large strain and large rotations) hyperelastic analysis. </p>
      <div class="title_refCategory">Format: </div>
      <div class="refCategoryContent">
         <table border="1" width="100%" align="center">
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                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">1 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">2 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">3 </p>
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                     <p class="para_th">4 </p>
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                     <p class="para_th">5 </p>
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                     <p class="para_th">6 </p>
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                     <p class="para_th">7 </p>
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                     <p class="para_th">8 </p>
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                     <p class="para_th">9 </p>
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                     <p class="para_th">10 </p>
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            <tbody>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CTRIAX </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">EID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">PID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G1 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G2 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G3 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G4 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G5 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G6 </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
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      <div class="title_refCategory">Example: </div>
      <div class="refCategoryContent">
         <table border="1" width="100%" align="center">
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            <tbody>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CTRIAX </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">111 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">203 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">31 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">74 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">75 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
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            </tbody>
         </table><br></div>
      <div class="title_refCategory">Fields:</div>
      <div class="refCategoryContent">
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               <col span="1" width="84*">
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                  <th align="left" colspan="1" rowspan="1">
                     <p class="para_th"><b class="uiTerm">Field </b></p>
                  </th>
                  <th align="left" colspan="1" rowspan="1">
                     <p class="para_th"><b class="uiTerm">Contents </b></p>
                  </th>
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            </thead>
            <tbody>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">EID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Element identification number.  (Integer &gt; 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">PID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Property identification number of a PLPLANE entry.  (Integer &gt; 0) </p>
                  </td>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">G1, G2, G3 </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Identification numbers of connected corner grid points.  Required data for all three grid points.  (Unique Integers &gt; 0) </p>
                  </td>
               </tr>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">G4, G5, G6 </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Identification numbers of connected edge grid points.  Optional data for any or all three grid points.  (Integer &ge; 0 or blank) </p>
                  </td>
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            </tbody>
         </table><br></div>
      <div class="title_refCategory">Remarks: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li>
               <p class="para_item">Element identification numbers must be unique with respect to all other element IDs of any kind. </p>
            </li>
            <li>
               <p class="para_item">Gi must be numbered as shown in <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/14topic_36.html#ref10701');return(false);">Figure 13-</a>. 
               </p>
            </li>
            <li>
               <p class="para_item">It is recommended that the edge points be located within the middle third of the edge. </p>
            </li>
            <li>
               <p class="para_item">The plot codes are specified under the CTRIAXFD element name in <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/09ref75809_1.html');return(false);">&ldquo;Item Codes&rdquo;</a>. 
               </p>
            </li>
            <li>
               <p class="para_item">The grid points of the axisymmetric element must lie on the x-y plane of the basic coordinate system.  Stress and strain are output in the basic coordinate system. </p>
            </li>
            <li>
               <p class="para_item">A concentrated load (e.g., FORCE entry) at Gi is divided by the radius to Gi and then applied as a force per unit circumferential length.  For example, in order to apply a load of 100 N/m on the circumference at G1, which is located at a radius of 0.5 m, the magnitude specified on the static load entry must result in: </p>
               <p align="center"><img align="bottom" src="graphics/bulkc2-equ09.gif"></p>
            </li>
         </ol>
      </div>
      <div class="title_refCategory">Remarks related to SOL 601: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li>
               <p class="para_item">Only elements with 3 or 6 grid points are allowed. </p>
            </li>
            <li>
               <p class="para_item">6-node elements may be converted to 7-node elements (with 1 additional node at the centroid of the element) by specifying ELCV=1 in the NXSTRAT entry. The 7-node element is more effective in the analysis of incompressible rubber-like materials. </p><a name="ref10701"></a><div class="figure">
                  <p align="center"><img align="bottom" src="graphics/bulkc2-fig36.gif"></p>
               </div>
               <div class="title_figure">Figure. CTRIAX Element Coordinate System </div>
            </li>
         </ol>
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