Add releases to areas

I have a simple model in which I want to add releases to an area edge.

I use the SAR and SARB commands to do so, but when I do it adds new nodes and messes up my node numbering, even though I explicitly tell it to use the existing nodes.

Is there an easier way of applying releases?
Please see the code below:

+prog Sofimshc urs:21.1
SYST 3D GDIV 100000 GDIR NEGZ
CTRL MESH 1
ctrl hmin 50
CTRL DELN 1
CTRL TOPO 0
CTRL EDRL 1

loop#i 3
    SPT 11+#i*10 X 0       Y #i*1000    Z 0
    SPT 12+#i*10 X 1000    Y #i*1000    Z 0
    SPT 13+#i*10 X 1000    Y #i*1000    Z 1000
    SPT 14+#i*10 X 0       Y #i*1000    Z 1000

    SAR 11+#i*10 MNO 11  GRP 11  T 100
        SARB TYPE OUT NA 11+#i*10 NE 12+#i*10
        SARB TYPE OUT NA 12+#i*10 NE 13+#i*10
        SARB TYPE OUT NA 13+#i*10 NE 14+#i*10
        SARB TYPE OUT NA 14+#i*10 NE 11+#i*10

    SLN 11+#i*10 NPA 11+#i*10 NPE 12+#i*10 FIX F
endloop

loop#i 2
    SAR 41+#i MNO 11  GRP 12+#i  T 100
        SARB TYPE OUT NA 13+#i*10 NE 23+#i*10
        SARB TYPE OUT NA 23+#i*10 NE 24+#i*10
        SARB TYPE OUT NA 24+#i*10 NE 14+#i*10
        SARB TYPE OUT NA 14+#i*10 NE 13+#i*10
endloop

$$$$$$$$$$$$ THIS IS THE PART IN QUESTION $$$$$$$
SAR -21
    SARB TYPE OUT NA 21 NE 22
    SARB TYPE OUT NA 22 NE 23
    SARB TYPE OUT NA 23 NE 24 FIX MX
    SARB TYPE OUT NA 24 NE 21
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

END

Correct node numbering (if I’m not adding the release):
Capture

Node numbering after adding the release:
Capture1

You need to have a double set of nodes at the point of release. (no way around it)

Under the hood in your non-release model you are:

  • Creating a set number of nodes
  • Assigning your quads to be attached to the nodes

In the release model you are:

  • creating one set of nodes for the top sars
  • one set of nodes for the “wall-sar”
  • connecting these node-sets omitting the mx degree of freedom

The degree of freedom is a node-node property.
If you want to have the exact same node numbers in both projects you should:

  • Define 2 sets of nodes
  • Define 2 sets of structural lines
  • Connect the structural lines with the constraints you are after (all=fixed or pratially)yourself
1 Like

Okay, thanks.

Is there anyway to define the node numbers of the new nodes myself then?
With the arbitrary node numbers it becomes quite difficult to find it in bigger models.

You just define them in the same place so:
Spt 23 x…
Spt 24 x…
Spt 123 x…
Spt 124 x…

Then you define to lines
Sln 22 Npa 23 npe 24
Sln 122 Npa 123 npe 124

And then you connect your sars to the slns
Sarb Type out NL 22 for the top sars Sarb Type out NL 122 for the wall sars

The you couple the sln’s
sln -22; slns fix F ref 122