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      <title>PTUBE</title>
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      <div class="title_refTopic" id="xps10_pagetitle">PTUBE </div>
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      <h4 class="refClassification">Tube Property </h4>
      <p class="para_refTopic">Defines the properties of a thin-walled cylindrical tube element (CTUBE entry). </p>
      <div class="title_refCategory">Format: </div>
      <div class="refCategoryContent">
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                     <p class="para_th">1 </p>
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                     <p class="para_th">2 </p>
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                     <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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                     <p class="para_td">PTUBE </p>
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                     <p class="para_td">PID </p>
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                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">MID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">OD </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">T </p>
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                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">NSM </p>
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                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">OD2 </p>
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                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
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                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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      <div class="title_refCategory">Example: </div>
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                     <p class="para_td">PTUBE </p>
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                     <p class="para_td">2 </p>
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                     <p class="para_td">6 </p>
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                     <p class="para_td">6.29 </p>
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                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">0.25 </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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      <div class="title_refCategory">Fields:</div>
      <div class="refCategoryContent">
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                     <p class="para_th"><b class="uiTerm">Field </b></p>
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                     <p class="para_th"><b class="uiTerm">Contents </b></p>
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                  <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.  (Integer &gt; 0) </p>
                  </td>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">MID </p>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Material identification number.  See Remarks <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/18topic_60.html#ref94578');return(false);">97-3</a> and <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/18topic_60.html#ref70596');return(false);">97-4. </a> (Integer &gt; 0) 
                     </p>
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                     <p class="para_td">OD </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Outside diameter of tube.  (Real &gt; 0.0) </p>
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                     <p class="para_td">T </p>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Thickness of tube.  (Real; T &le; OD/2.0) </p>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">NSM </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Nonstructural mass per unit length.  (Real) </p>
                  </td>
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                     <p class="para_td">OD2 </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Diameter of tube at second grid point (G2) on CTUBE entry.  (Real; Default = OD) </p>
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         </table><br></div>
      <div class="title_refCategory">Remarks: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li>
               <p class="para_item">If T is zero, a solid circular rod is assumed. </p>
            </li>
            <li>
               <p class="para_item">PTUBE entries must all have unique property identification numbers. </p>
            </li>
            <li><a name="ref94578"></a><p class="para_item">For structural problems, MID must reference a MAT1 material entry. </p>
            </li>
            <li><a name="ref70596"></a><p class="para_item">For heat transfer problems, MID must reference a MAT4 or MAT5 material entry. </p>
            </li>
            <li>
               <p class="para_item">Tapered OD tubes with constant wall thickness are available for heat transfer only.  The effective diameter is given by: </p>
               <p align="center"><img align="bottom" src="graphics/bulkp-equ36.gif"></p>
               <p class="para_item">where: </p>
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                           <p class="para_td"><em>D</em><sub class="subscript">1</sub></p>
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                           <p class="para_td">= </p>
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                           <p class="para_td"><em>OD</em></p>
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                           <p class="para_td"><em>D</em><sub class="subscript">2</sub></p>
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                           <p class="para_td">= </p>
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                           <p align="center"><img align="bottom" src="graphics/bulkp-equ37.gif"></p>
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         </ol>
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