Elasticity.md

+<table>
+  <tr>
+    <th colspan="2" style="text-align:center;font-weight:bold">
+Elastic wrench
+    </th>
+  </tr>
+  <tr>
+    <td style="text-align:center">
+<a href="https://gitlab.onelab.info/doc/tutorials/raw/master/Elasticity/screenshot1.png"><img src="https://gitlab.onelab.info/doc/tutorials/raw/master/Elasticity/screenshot1_512.png" width="100%"></a>
+    </td>
+    <td style="text-align:center">
+<a href="https://gitlab.onelab.info/doc/tutorials/raw/master/Elasticity/microstrip.png"><img src="https://gitlab.onelab.info/doc/tutorials/raw/master/Elasticity/microstrip_512.png" width="100%"></a>
+    </td>
+  </tr>
+  <tr>
+    <th colspan="2" style="text-align:center">
+<!--
+Download <a href="http://onelab.info/files/machines.zip">model archive (machines.zip)</a><br>
+-->
+Browse <a href="https://gitlab.onelab.info/doc/tutorials/tree/master/Elasticity/">model files</a>
+    </th>
+  </tr>
+</table>
+
+## Quick start
+
+To run the model, open `wrench2D.pro` with Gmsh
+and click on the "Run" button in the left panel. 
+
+## Features addressed in this tutorial
+
+  * $`\nabla u`$ GetDP specific formulation for linear elasticity
+  * First and second order elements 
+  * Triangular and quadrangular elements
+  
+## Additional information
+
+This is the elastic 2D model of a wrench.
+The tool is clamped at the nut (which is not represented)
+and a vertical downward force of 100N is distributed over a 1 inch large surface
+on the upper face of the wrench's arm. 
+
+## References
+
+1. [GetDP documentation](http://getdp.info/doc/texinfo/getdp.html)
+
+
+<table width="100%">
+  <tr>
+    <td>
+This work was funded in part by the Walloon Region (WBGreen No 1217703 FEDO, WIST3 No 1017086 ONELAB) and by the Belgian Science Policy (IAP P7/02). Copyright (c) 2012-2017 ULg-ULB.
+    </td>
+  </tr>
+</table>