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      <title>CRAC3D</title>
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      <div class="title_refTopic" id="xps10_pagetitle">CRAC3D </div>
      <hr noshade="true">
      <h4 class="refClassification">Three-Dimensional Crack Tip Element </h4>
      <p class="para_refTopic">Defines a three-dimensional crack tip element. </p>
      <div class="title_refCategory">Format: </div>
      <div class="refCategoryContent">
         <table border="1" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
            </colgroup>
            <thead>
               <tr>
                  <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>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">4 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">5 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">6 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">7 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">8 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">9 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">10 </p>
                  </th>
               </tr>
            </thead>
            <tbody>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CRAC3D </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" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G7 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G8 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G9 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G10 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G11 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G12 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G13 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G14 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G15 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G16 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G17 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G18 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G19 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G20 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G21 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G22 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G23 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G24 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G25 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G26 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G27 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G28 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G29 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G30 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G31 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G32 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G33 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G34 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G35 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G36 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G37 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G38 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G39 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G40 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G41 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G42 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G43 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G44 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G45 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G46 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G47 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G48 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G49 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G50 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G51 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G52 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G53 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G54 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G55 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G56 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G57 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G58 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G59 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G60 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G61 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G62 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G63 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G64 </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
            </tbody>
         </table><br></div>
      <div class="title_refCategory">Example: </div>
      <div class="refCategoryContent">
         <table border="1" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
            </colgroup>
            <tbody>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CRAC3D </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">113 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">101 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">2 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">5 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">7 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">8 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">4 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">10 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">11 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">14 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">15 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">17 </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">3 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">6 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">9 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">12 </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">16 </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">102 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">105 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">107 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">108 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">104 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">110 </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">114 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">115 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">117 </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">103 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">106 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">109 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">112 </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">116 </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">202 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">205 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">207 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">208 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">204 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">210 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">211 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">214 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">215 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">217 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">225 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">226 </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>
                  <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>
               </tr>
            </tbody>
         </table><br></div>
      <div class="title_refCategory">Fields:</div>
      <div class="refCategoryContent">
         <table cellpadding="9" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="16*">
               <col span="1" width="84*">
            </colgroup>
            <thead>
               <tr>
                  <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>
               </tr>
            </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 PRAC3D entry.  (Integer &gt; 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Gi </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Grid point identification numbers of connection points.  (Integer &ge; 0) </p>
                  </td>
               </tr>
            </tbody>
         </table><br></div>
      <div class="title_refCategory">Remarks: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li>
               <p class="para_item">The following is a dummy element and requires the presence of one Bulk Data entry of the form: </p>
               <table border="1" width="100%" align="center">
                  <colgroup span="1">
                     <col span="1" width="10*">
                     <col span="1" width="10*">
                     <col span="1" width="10*">
                     <col span="1" width="10*">
                     <col span="1" width="10*">
                     <col span="1" width="10*">
                     <col span="1" width="10*">
                     <col span="1" width="10*">
                     <col span="1" width="10*">
                     <col span="1" width="10*">
                  </colgroup>
                  <tbody>
                     <tr>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">ADUM9 </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">64 </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">0 </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">6 </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">0 </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">CRAC3D </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>
                     </tr>
                  </tbody>
               </table><br></li>
            <li>
               <p class="para_item">Element identification numbers should be unique with respect to all other element identification numbers. </p>
            </li>
            <li>
               <p class="para_item">This element, including grid point numbering conventions, is shown in <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/14topic_21.html#ref79166');return(false);">Figure 13-</a> and <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/14topic_21.html#ref13992');return(false);">Figure 13-</a>. grid points G1 through G10, and G19 through G28 are required; midside and surface grid points G11 through G18, G29 through G36, and G37 through G64 are optional.  Either all or none of grid points G37 through G46 should be present.  A fatal error message will be issued for partial connectivity. 
               </p>
            </li>
            <li>
               <p class="para_item">For the symmetric half-crack option grid points G1 through G7, and G19 through G25 are required, whereas grid points G11 through G14, G29 through G32, and G37 through G42 are optional.  Grid points G8 through G10, G15 through G18, G26 through G28, G33 through G36, G43 through G46, G51 through G55, and G60 through G64 should not be specified to invoke this option. </p>
            </li>
            <li>
               <p class="para_item">It is recommended that both the faces (formed by grid points G1 through G18 and grid points G19 through G36) and the midplane (formed by grid points G37 through G46) be planar.  It is also recommended that midside grid points G37 through G46 be located within the middle third of the edges. </p>
            </li>
            <li>
               <p class="para_item">The midside nodes on both the faces should be defined in pairs.  For example, if grid point G11 is not defined, then grid point G29 should not be defined and vice versa. </p>
            </li>
            <li>
               <p class="para_item">The stresses and stress intensity factors are calculated with the assumptions that grid points G2 and G10, G20 and G28, and G38 and G46 are coincident.  Deviation from this condition will produce erroneous results. </p>
            </li>
            <li>
               <p class="para_item">The stress output is interpreted as described in <a class="links" href="javascript:void(0)" onclick="top.popUpPage('QRG/linkInter_target_not_resolved.html#element:ref49048:-aux,-home','linkInter','menubar=yes,status=yes,resizable=yes,toolbar=yes,scrollbars=yes,location=no,directories=no');return(false);">&ldquo;Three-Dimensional Crack Tip Element (CRAC3D)&rdquo; </a>in the <em>NX Nastran Element Library</em>. 
               </p><a name="ref79166"></a><div class="figure">
                  <p align="center"><img align="bottom" src="graphics/bulkc2-fig19.gif"></p>
               </div>
               <div class="title_figure">Figure. CRAC3D Solid Crack Tip Element with Required Connection Points Only </div><a name="ref13992"></a><div class="figure">
                  <p align="center"><img align="bottom" src="graphics/bulkc2-fig20.gif"></p>
               </div>
               <div class="title_figure">Figure. CRAC2D Solid Crack Tip Element with All Connection Points </div>
            </li>
         </ol>
      </div>
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