Reply To: constrained_node_set does not work

[Armin]

Hi Mostafa,

Here are some suggestions:

Assuming that your parts are flexible (not rigid), separation on the sharing nodes may occur if the nodes included in the set are subjected to other constraints, including prescribed motion using *BOUNDARY_PRESCRIBED_MOTION. 
Also, it is important to verify that the constrained nodes are not set to become inactive at a certain failure time as this would allow the nodes to move freely after the specified time. This is defined using the parameter TF of the *CONSTRAINED_NODE_SET card.