Learning Forum

[manuel.uruena]

Hi everyone,

I am using cerig constraint equation in APDL to link the UZ degree of freedom of two nodes connected by a spring element. The master node has a displacement applied in UZ and UX UY constraint, while the slave node has UX and UY constraint.

mapdl.cerig('58', '4200069','UZ')

In the results, the master node moves in UZ direction but the slave node doesnt. The contraint seems correctly defined. I have also tried CP command but the result is the same. How can I make both nodes share the UZ displacement?

 

[Erik Kostson]

 

Hi

 

This is pyMAPDL. I would sugget to do this manually (in MAPDL) on a simple model make sure CP (coupling nodes together) commands do what you want, and then move over and do the same simple example (not with 4 million nodes) in pyMAPDL.

 

All the best

 

 

 

[mrife]

Hi manuel.uruena What type of spring elements are you using?  Most only have one type of DOF i.e. translation or rotation, but not both.  And the cerig command is looking to tie the both translation and rotation DOFs of node 58 to UZ of 4200069.  Which should fail since it's one type of DOF or the other, and not both.  I'm guessing you meant to use the CE command instead.  Mike

[guy-hermann.youdom-yimbi.1]

I have the same problem, I'm trying to create a rigid region. I created components with my independent node and all the depend node.

When I issued that code :

Cerig,noeud_directeur,noeud_conducteur,all

I got an error message saying that the independent node is unselected, the cerig command is ignored.

What should I do. 

Thanks in advance