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      <title>PWELD</title>
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      <div class="title_refTopic" id="xps10_pagetitle">PWELD </div>
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      <h4 class="refClassification">WELD Element Property </h4>
      <p class="para_refTopic">Defines the properties of connector (CWELD) elements. </p>
      <div class="title_refCategory">Format: </div>
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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">PWELD </p>
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                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">PID </p>
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                     <p class="para_td">MID </p>
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                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">D </p>
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                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">MSET </p>
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                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
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                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">TYPE </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">PWELD </p>
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                     <p class="para_td">100 </p>
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                     <p class="para_td">3 </p>
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                     <p class="para_td">1.0 </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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                     <p class="para_td">&nbsp; </p>
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      <div class="title_refCategory">Fields:</div>
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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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                     <p class="para_td">PID </p>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Property identification number. (Integer &gt; 0) </p>
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                     <p class="para_td">MID </p>
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                     <p class="para_td">Material identification number. See Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/18topic_63.html#ref13839');return(false);">101-1. </a> (Integer &gt; 0) 
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                     <p class="para_td">D </p>
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                     <p class="para_td">Diameter of the connector. See Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/18topic_63.html#ref13839');return(false);">101-1. </a> (Real &gt; 0) 
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                     <p class="para_td">MSET </p>
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                     <p class="para_td">Flag to eliminate m-set degrees of freedom.See Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/18topic_63.html#ref28584');return(false);">101-2. </a> (Character: &ldquo;ON&rdquo; or &ldquo;OFF&rdquo;; Default= &ldquo;ON&rdquo;) 
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                     <p class="para_td">TYPE </p>
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                     <p class="para_td">Character string indicating the type of connection. See Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/18topic_63.html#ref90478');return(false);">101-3. </a> (Character: &rdquo;SPOT&rdquo; or blank; Default=blank, &ldquo;SPOT&rdquo;= spot weld connector, blank= general connector) 
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      <div class="title_refCategory">Remarks: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li><a name="ref13839"></a><p class="para_item">Material MID, diameter D, and the length are used to calculate the stiffness of the connector in 6 directions. MID can only refer to the MAT1 Bulk Data entry.   The length is the distance of GA to GB, see <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/18topic_63.html#ref10048');return(false);">Figure 17-</a>. 
               </p><a name="ref10048"></a><div class="figure">
                  <p align="center"><img align="bottom" src="graphics/bulkp-fig21.gif"></p>
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               <div class="title_figure">Figure. Length and Diameter of the Weld Connector </div>
            </li>
            <li><a name="ref28584"></a><p class="para_item">MSET=&rdquo;ON&rdquo; (default) generates explicit m-set constraints. MSET=&rdquo;OFF&rdquo; incorporates constraints at the element stiffness matrix level avoiding explicit m-set constraint equations. For example, if a patch-to-patch connection is specified with the formats &ldquo;GRIDID&rdquo; or &ldquo;ELEMID&rdquo; on the CWELD entry, and MSET=ON is specified, 2x6 explicit constraints are generated which connect  the 6 degrees of freedom of GA to the translational degrees of freedom of GAI and the 6 degrees of freedom of GB to GBI. The 2x6 degrees of freedom of GA and GB are put into the m-set. The constraints are labeled &ldquo;RWELD&rdquo;. The identification numbers of the generated RWELD constraint elements start with an offset specified on PARAM, OSWELM. If MSET=OFF is specified, the 2x6 constraint equations are built into the stiffness matrix of the CWELD element thereby condensing the 2x6 degrees of freedom of GA and GB. MSET=OFF is only available for the patch-to-patch connection (GRIDID or ELEMID). </p>
            </li>
            <li><a name="ref90478"></a><p class="para_item">For TYPE= &ldquo;SPOT&rdquo;, if the &ldquo;ELEMID&rdquo; format on the CWELD entry is used, then the effective length for the stiffness of the CWELD element is set to <em>L<sub class="subscript">e</sub></em>=1/2(<em>t<sub class="subscript">A</sub></em>+<em>t<sub class="subscript">B</sub></em>) regardless of the distance GA to GB. <em>t<sub class="subscript">A</sub></em> and <em>t<sub class="subscript">B</sub></em> are the shell thicknesses of shell <em>A</em> and <em>B</em> respectively. For all other cases, the effective length of the CWELD element is equal to the true length, the distance of GA to GB, as long as the ratio of length to diameter is in the range 0.2&le;<em>L</em>/<em>D</em>&le;5.0. If <em>L</em> is below the range, the effective length is set to <em>L<sub class="subscript">e</sub></em>=0.2<em>D</em> and if <em>L</em> is above the range, the effective length is set to <em>L<sub class="subscript">e</sub></em>=5.0<em>D</em>. 
               </p>
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