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<div id="content">
<h1 class="title">C++ IO support for various FEM exchange file formats</h1>
<div id="table-of-contents">
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
<li><a href="#org33f75e3">1. Supported FEM file formats</a>
<ul>
<li><a href="#orgc363189">1.1. Unit system considerations</a></li>
<li><a href="#orgd3ea291">1.2. NASTRAN Bulk Data Format (BDF)</a>
<ul>
<li><a href="#orgc63bd0e">1.2.1. BDF Cards supported</a>
<ul>
<li><a href="#org57ea520">1.2.1.1. Bulk Data</a></li>
<li><a href="#org3b9a594">1.2.1.2. Header Data</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#orgd75547b">1.3. DNV GL Seasam Input Interface File (FEM)</a>
<ul>
<li><a href="#orgd25b24d">1.3.1. FEM Cards supported</a></li>
<li><a href="#orgbfa507a">1.3.2. Element Types in SESAM</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</div>
<div id="outline-container-org33f75e3" class="outline-2">
<h2 id="org33f75e3"><span class="section-number-2">1</span> Supported FEM file formats</h2>
<div class="outline-text-2" id="text-1">
<p>
Not all functionality defined for the exchange file formats is
supported. The supported subset is currently mainly defined by the
functionality supported in GLFrame rspt. the BMF file format.
</p>
<p>
More detailed information on supported functionality can be found in
the according directories in the <code>docs</code> subdirectory.
</p>
</div>
<div id="outline-container-orgc363189" class="outline-3">
<h3 id="orgc363189"><span class="section-number-3">1.1</span> Unit system considerations</h3>
<div class="outline-text-3" id="text-1-1">
<p>
Unit systems used by the different systems are:
</p>
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<col class="org-left" />
<col class="org-left" />
<col class="org-left" />
<col class="org-left" />
</colgroup>
<thead>
<tr>
<th scope="col" class="org-left">Dimension \ System</th>
<th scope="col" class="org-left">Poseidon</th>
<th scope="col" class="org-left">Nastran</th>
<th scope="col" class="org-left">Sesam / GeniE</th>
</tr>
</thead>
<tbody>
<tr>
<td class="org-left">L (Length Unit)</td>
<td class="org-left">[m] for nodes</td>
<td class="org-left">[m]</td>
<td class="org-left">[m]</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left">[mm] for plate thicknesses</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
</tr>
<tr>
<td class="org-left">M (Mass Unit)</td>
<td class="org-left">[t]</td>
<td class="org-left">[t]</td>
<td class="org-left">[t]</td>
</tr>
<tr>
<td class="org-left">ML/T² Force Unit)</td>
<td class="org-left">[kN]</td>
<td class="org-left">[kN]</td>
<td class="org-left">[kN]</td>
</tr>
</tbody>
</table>
<p>
Yield stress is stored in [kN/m²] in Sesam / GeniE, but [N/mm²] in POSEIDON.
</p>
</div>
</div>
<div id="outline-container-orgd3ea291" class="outline-3">
<h3 id="orgd3ea291"><span class="section-number-3">1.2</span> NASTRAN Bulk Data Format (BDF)</h3>
<div class="outline-text-3" id="text-1-2">
</div>
<div id="outline-container-orgc63bd0e" class="outline-4">
<h4 id="orgc63bd0e"><span class="section-number-4">1.2.1</span> BDF Cards supported</h4>
<div class="outline-text-4" id="text-1-2-1">
</div>
<div id="outline-container-org57ea520" class="outline-5">
<h5 id="org57ea520"><span class="section-number-5">1.2.1.1</span> Bulk Data</h5>
<div class="outline-text-5" id="text-1-2-1-1">
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<col class="org-left" />
<col class="org-left" />
<col class="org-left" />
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<tr>
<th scope="col" class="org-left"> </th>
<th scope="col" class="org-left"><b>Name</b></th>
<th scope="col" class="org-left"><b>Description</b></th>
<th scope="col" class="org-left"><b>Read</b></th>
<th scope="col" class="org-left"><b>Write</b></th>
</tr>
</thead>
<tbody>
<tr>
<td class="org-left">General</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>MAT1</code></td>
<td class="org-left">Material definition</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>MAT2</code></td>
<td class="org-left">Shell Element Anisotropic Material Property Definition</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>GRID</code></td>
<td class="org-left">Grid nodes</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">Elements</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>CTRIA3</code></td>
<td class="org-left">3 node shaped shell elements</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>CQUAD4</code></td>
<td class="org-left">4 node shaped shell elements</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>CBEAM</code></td>
<td class="org-left">Complex beams <sup><a id="fnr.1" class="footref" href="#fn.1">1</a></sup></td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>CBAR</code></td>
<td class="org-left">Simple beams</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>CROD</code></td>
<td class="org-left">Trusses</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>CBUSH</code></td>
<td class="org-left">Generalized Spring-and-Damper Connection</td>
<td class="org-left">✗</td>
<td class="org-left">✓</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">Element</td>
<td class="org-left">properties</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>PSHELL</code></td>
<td class="org-left">Properties for <code>CTRIA3</code>, and <code>CQUAD4</code></td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>PBEAM</code></td>
<td class="org-left">Integral properties for <code>CBEAM</code></td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>PBEAML</code></td>
<td class="org-left">Properties for <code>CBEAM</code> describing cross section</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>PBAR</code></td>
<td class="org-left">Integral properties for <code>CBAR</code></td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>PBARL</code></td>
<td class="org-left">Properties for <code>CBAR</code> describing cross section</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>PROD</code></td>
<td class="org-left">Properties for <code>CROD</code></td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>PBUSH</code></td>
<td class="org-left">Generalized Spring-and-Damper Property</td>
<td class="org-left">✗</td>
<td class="org-left">✓</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">Load</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>LOAD</code></td>
<td class="org-left">Load case combination</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>FORCE</code></td>
<td class="org-left">Forces on Nodes</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>MOMENT</code></td>
<td class="org-left">Moments on Nodes</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>CONM1</code></td>
<td class="org-left">Concentrated Mass Element Connection, General Form</td>
<td class="org-left">✗</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>CMASS2</code></td>
<td class="org-left">Scalar Mass Property and Connection</td>
<td class="org-left">✓</td>
<td class="org-left">✗</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>CMASS4</code></td>
<td class="org-left">Scalar Mass Property and Connection to Scalar Points Only</td>
<td class="org-left">✓</td>
<td class="org-left">✗</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>GRAV</code></td>
<td class="org-left">Acceleration or Gravity Load</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">Misc</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>ENDDATA</code></td>
<td class="org-left">Marker for end of input file</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>PARAM</code></td>
<td class="org-left">Specifies values for parameters used in solution sequences or user written <code>DMAP</code> programs.</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
</tr>
</tbody>
</table>
</div>
</div>
<div id="outline-container-org3b9a594" class="outline-5">
<h5 id="org3b9a594"><span class="section-number-5">1.2.1.2</span> Header Data</h5>
<div class="outline-text-5" id="text-1-2-1-2">
<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<colgroup>
<col class="org-left" />
<col class="org-left" />
<col class="org-left" />
<col class="org-left" />
</colgroup>
<thead>
<tr>
<th scope="col" class="org-left"><b>Name</b></th>
<th scope="col" class="org-left"><b>Description</b></th>
<th scope="col" class="org-left"><b>Read</b></th>
<th scope="col" class="org-left"><b>Write</b></th>
</tr>
</thead>
<tbody>
<tr>
<td class="org-left"><code>SOL</code></td>
<td class="org-left">Execute a Solution Sequence</td>
<td class="org-left">✗</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"><code>CEND</code></td>
<td class="org-left">End of Executive Control Delimiter</td>
<td class="org-left">✗</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"><code>TITLE</code></td>
<td class="org-left">Output Title</td>
<td class="org-left">✗</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"><code>ECHO</code></td>
<td class="org-left">Bulk Data Echo Request</td>
<td class="org-left">✗</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"><code>DISPLACEMENT</code></td>
<td class="org-left">Displacement Output Request</td>
<td class="org-left">✗</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"><code>SPCFORCES</code></td>
<td class="org-left">Single-Point Forces of Constraint Output Request</td>
<td class="org-left">✗</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"><code>STRESS</code></td>
<td class="org-left">Element Stress Output Request</td>
<td class="org-left">✗</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"><code>LOAD</code></td>
<td class="org-left">External Static Load Set Selection</td>
<td class="org-left">✗</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"><code>SUBTITLE</code></td>
<td class="org-left">Output Subtitle</td>
<td class="org-left">✗</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"><code>SUBCASE</code></td>
<td class="org-left">Subcase Delimiter</td>
<td class="org-left">✗</td>
<td class="org-left">✓</td>
</tr>
<tr>
<td class="org-left"><code>BEGIN</code> <code>BULK</code></td>
<td class="org-left">Case Control and Bulk Data Delimiter</td>
<td class="org-left">✗</td>
<td class="org-left">✓</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
<div id="outline-container-orgd75547b" class="outline-3">
<h3 id="orgd75547b"><span class="section-number-3">1.3</span> DNV GL Seasam Input Interface File (FEM)</h3>
<div class="outline-text-3" id="text-1-3">
</div>
<div id="outline-container-orgd25b24d" class="outline-4">
<h4 id="orgd25b24d"><span class="section-number-4">1.3.1</span> FEM Cards supported</h4>
<div class="outline-text-4" id="text-1-3-1">
<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<colgroup>
<col class="org-left" />
<col class="org-left" />
<col class="org-left" />
</colgroup>
<colgroup>
<col class="org-left" />
<col class="org-left" />
</colgroup>
<colgroup>
<col class="org-right" />
</colgroup>
<thead>
<tr>
<th scope="col" class="org-left"> </th>
<th scope="col" class="org-left"><b>Name</b></th>
<th scope="col" class="org-left"><b>Description</b></th>
<th scope="col" class="org-left"><b>Read</b></th>
<th scope="col" class="org-left"><b>Write</b></th>
<th scope="col" class="org-right"><b>Page<sup><a id="fnr.2" class="footref" href="#fn.2">2</a></sup></b></th>
</tr>
</thead>
<tbody>
<tr>
<td class="org-left">General</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-right"> </td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>DATE</code></td>
<td class="org-left">Date and Program Information</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">4-2</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>GCOORD</code></td>
<td class="org-left">Nodal Coordinates</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-56</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>GNODE</code></td>
<td class="org-left">Correspondence between External and Internal Node Numbering, and Number of Degrees of Freedom of Each Node</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-80</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>IDENT</code></td>
<td class="org-left">Identification of Superelements</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">4-3</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>IEND</code></td>
<td class="org-left">End of a Superelement</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">4-4</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">Elements</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-right"> </td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>GELMNT1</code></td>
<td class="org-left">Element Data Definition</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-65</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>GELREF1</code></td>
<td class="org-left">Reference to Element Data</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-66</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">Element</td>
<td class="org-left">properties</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-right"> </td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>GBEAMG</code></td>
<td class="org-left">General Beam Element Data</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-49</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>GBARM</code></td>
<td class="org-left">Cross Section Type Massive Bar</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-48</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>GIORH</code></td>
<td class="org-left">Cross Section Type I or H Beam</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-71</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>GLSEC</code></td>
<td class="org-left">Cross Section Type L-Section</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-76</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>GPIPE</code></td>
<td class="org-left">Cross Section Type Tube</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-81</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>GUSYI</code></td>
<td class="org-left">Cross Section Type Unsymmetrical I-Beam</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-93</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>GECCEN</code></td>
<td class="org-left">Eccentricities</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-61</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>BELFIX</code></td>
<td class="org-left">Flexible Joint/Hinge</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-8</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>GELTH</code></td>
<td class="org-left">Thickness of Two-dimensional Elements</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-70</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">Load</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-right"> </td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>BLDEP</code></td>
<td class="org-left">Nodes with Linear Dependence</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-27</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>BNBCD</code></td>
<td class="org-left">Nodes with Boundary Conditions</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-30</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>BNDISPL</code></td>
<td class="org-left">Nodes with Prescribed Displacements and Accelerations</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-31</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>BNLOAD</code></td>
<td class="org-left">Nodes with Loads</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-35</td>
</tr>
<tr>
<td class="org-left"> </td>
<td class="org-left"><code>MGSPRNG</code></td>
<td class="org-left">Element to Ground</td>
<td class="org-left">✓</td>
<td class="org-left">✓</td>
<td class="org-right">6-103</td>
</tr>