Rarka,

Unfortunately the picture you included doesn’t allow me to read the dimensions, so I can’t offer specific information. However I can offer some comments:

1) Due to recent changes in Caesar II you can no longer use a zero length expansion joint with a restraint, this only affects hinge joints. So, you will have to do a detailed model.

2) Enter the actual bellows length. This should be the convoluted length only and not the tangent to tangent dimension shown on the drawing.

3) Enter the actual bellows spring rates, axial, angular, torsional and effective ID. Omit the lateral.

4) Create two rigid elements, one spanning from the inlet to the center line of the bellows and the other from the outlet to the center line of the bellows. The rigid elements should be set at ambient temperature.

5) Connect the two rigid elements via c-nodes and restrain X, Y, Z, Ry & Rz.

Consult the CAESAR II manual for additional information.
I hope this helps,
Dan