node DOF syntax for ccx (pipe_clip example)

dmac

*AMPLITUDE,NAME=pipe_displacement

0,0

10,-12e-3

*BOUNDARY,AMPLITUDE=pipe_displacement

pipe_end,2,2,1

This is the text inserted into the pipe_clip example for sliding contact in CCX

pipe_end is a group of nodes with the constraint 2,2,1

For the life of me I cant figure out the 2,2,1 syntax, although it must be a some version of notation for " constrained in x, constrained in z, and multiplier of amplitude value"

I would like to figure this syntax out so I can make my own model for a press fit.

The pipe_clip simulation is running fine.

Thanks in advance.

dmac

Sergio

Read as:

2,2 are the DOFs, so it means "from DOF 2 to DOF 2" that is only 2 (but you could have 1,3 that is 1,2,3...or 1,6 or 3,5...). DOF 2 is Y displacement

1 means "apply a displacement of 1 multiplied by the amplitud of the step", so as in this case the amplitud at time 10 (end of step) is -12e-3, that 1 is equal to say "apply a displacement of -12e3" (at the end of step)

and as Mecway write the input files in meters, is 12 mm in negative Y direction.

Regards

dmac

Thank you for the answer!

Sergio

Personally I preffer to define the time amplitude table as (with time step 1)

*AMPLITUDE,NAME=AMP_1

0,0

1,1

Then the displacement boundary condition would be writted as

*BOUNDARY,AMPLITUDE=AMP_1

pipe_end,2,2,-12e-3

So in case of having another displacement applied I could use the same amplitud definition because the value is not defined there. Also is easy to me to read the value of the displacement directly in the BOUNDARY card and not in the AMPLITUDE.

Regards

dmac

very clever, thanks again.