Example 3

This example was suggested by Katalin Krisztina Klinka, a Civil Enginnering student from Budapest University of Technology and Economics.

Run GiD.

Select Data --> Problem type --> formfind.

Select Geometry --> Create --> Point.

Point Coordinates
1   -5.0, -8.6603, 0.0
2    0.0, -6.9282, 0.0
3    5.0, -8.6603, 0.0
4    6.0, -3.4641, 0.0
5   10.0,  0.0000, 0.0
6    6.0,  3.4641, 0.0
7    5.0,  8.6603, 0.0
8    0.0,  6.9282, 0.0
9   -5.0,  8.6603, 0.0
10   -6.0,  3.4641, 0.0
11  -10.0,  0.0000, 0.0
12   -6.0, -3.4641, 0.0

At the command prompt, enter the following 12 point coordinates in a single line: -5.0,-8.6603,0.0 0.0,-6.9282,0.0 5.0,-8.6603,0.0 6.0,-3.4641,0.0 10.0,0.0000,0.0 6.0,3.4641,0.0 5.0,8.6603,0.0 0.0,6.9282,0.0 -5.0,8.6603,0.0 -6.0,3.4641,0.0 -10.0,0.0000,0.0 -6.0,-3.4641,0.0

Press ESC to leave point creation.

Select View --> Zoom --> Frame.

Select View --> Label --> All in --> POINT.

Select Geometry --> Create --> Arc.

Click next to point 1 and click JOIN, click next to point 2 and click JOIN, click next to point 3 and click JOIN. Repeat this procedure for points (3,4,5), (5,6,7), (7,8,9), (9,10,11) and (11,12,1).

Press ESC to leave arc creation.

Select Geometry --> Create --> Line.

Click next to point 11 and click JOIN, click next to point 5 and click JOIN. Press ESC to leave line creation.

Press ESC to leave entering points.

Select View --> Label --> Off. Select View --> Label --> All in --> LINE.

Select Geometry --> Create --> NURBS surface --> By contour.

Click on each of the following lines (1,2,7,6). Press ESC to leave entering lines. Repeat this procedure for lines (4,5,7,3).

Press ESC to leave NURBS surface creation.

Select Data --> Materials --> Fabric --> Assign --> Surfaces. Then click one of the interior sides for each NURBS surface. Then click Finish. Then click Close.

Select Meshing --> Generate. Enter 1.3 for the size of elements. Then click Ok. Then Click Ok.

Select Data --> Conditions --> Displacement.

Assign displacements to points according to the following table. Click Assign, click near the point. Click Finish. After the last point, click Close.

Point Displacements
100  -1.523081,  0.000000, 0.891001
88  -1.418223,  0.000000, 2.093213
82  -1.305372,  0.000000, 3.132628
77  -1.184148,  0.000000, 4.047562
73  -1.054194,  0.000000, 4.855675
72  -0.915184,  0.000000, 5.564087
69  -0.766833,  0.000000, 6.173482
71  -0.608907,  0.000000, 6.679972
76  -0.441230,  0.000000, 7.075905
80  -0.263700,  0.000000, 7.350085
93  -0.076296,  0.000000, 7.487515
107   0.116415,  0.000000, 7.470915
122   0.299277,  0.000000, 7.306588
133   0.472262,  0.000000, 7.012986
145   0.635432,  0.000000, 6.604354
157   0.788923,  0.000000, 6.091402
166   0.932938,  0.000000, 5.481519
179   1.067737,  0.000000, 4.778578
190   1.193624,  0.000000, 3.982195
208   1.310942,  0.000000, 3.086084
227   1.420058,  0.000000, 2.074435
237   1.523081,  0.000000, 0.891001
238  -1.000000, -1.732051, 0.000000
249   1.000000, -1.732051, 0.000000
99   1.000000,  1.732051, 0.000000
1  -1.000000,  1.732051, 0.000000

Select File --> Save as. Then select a folder (Directory) and a project name (File name). Click Save.

Important: The input file (input.txt) for the computer code (formfind.exe) will be available in this folder.

Select Calculate --> Calculate. Click OK.

Select Files --> Postprocess.

Select View results --> Contour Fill --> Stress 1 (notice that these stresses have no meaning).  Select View --> Rotate --> Trackball. Press the left button and drag around the screen.

Select View results --> No results. Select View --> Render --> Smooth lighting.