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DOF only locked in one direction

Altair Forum User

Hello @ all,

Is it possible to lock a DOF in only one direction/way?

For example:

I want to block a DOF in the 'minus x direction', but it should be able to move in the positiv way.

Is it possible and how to do this?

Thanks for your help.

Greets,

Thomas

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Accepted answers

All comments

tinh

perhaps you need to do this by CGAP elements

check reference guide about CGAP

Altair Forum User

Hi Thomas,

here is a workaround using GAP elements (as Tinh suggested)

This can be accomplished using gap elements. Please refer below for the steps.

1. Create a duplicate node and translate it along negative X direction (any small distance.)
2. Create a gap element such that N1  N2 is directed in negative X direction. (Make sure to place the gap element in separate collector)
3. Create a PGAP property and assign it to the CGAP element.
4. Card edit the PGAP property and enter say KB = 2E+20 (basically a high value)

This will restrict the motion of the node (N1) in negative X direction.