#1 2020-11-06 23:41:55

AlbiBone

Member

Registered: 2020-10-05

Posts: 5

[SOLVED] Overconstrain of nodes due to "several times locked" BC error

Hello,
I have a structure, with two BCs such that a node is subjected to both of them (see the simplified sketch below, the A node shows at the same time both BCs.

                              this face: dy=0
                      A*-------------------------*D
 this face:            |                         |
 dx=0, dy=0            |                         |
                       |                         |
                      B*-------------------------*C

I get the following error:

   !-----------------------------------------------------------!
   ! <EXCEPTION> <ASSEMBLA_26>                                 !
   !                                                           !
   !  the node:  N105 component:  DZ several times are locked. !
   !-----------------------------------------------------------!

Is it possible to set to the node to respect only one of the two BC or do I need inevitably to delete one of the two BC from such node?

I prefer to don't delete the BC from such node since I select the group of node from the face of the body (and therefore if I select the entire face).
Thanks and best regards,
A

Last edited by AlbiBone (2020-11-07 12:20:14)

mf

Member

Registered: 2019-06-18

Posts: 145

Re: [SOLVED] Overconstrain of nodes due to "several times locked" BC error

Hi,

some kinds of BCs allow for excluding of groups of nodes/elements (SANS_GROUP_MA, SANS_GROUP_NO) or you could create a third group with the nodes that fall into this 'group' that cause the error, so you can use it whenever necessary,

Mario.

Last edited by mf (2020-11-07 00:13:50)

AlbiBone

Member

Registered: 2020-10-05

Posts: 5

Re: [SOLVED] Overconstrain of nodes due to "several times locked" BC error

Thanks for the replay Mario: you solved my problems!

For other users, you just need to scroll down in the menu where you specify one of the two BC, enter in "Exclude group of node" or "exclude group of element" (-> SANS_GROUP_NO, SANS_GROUP_MA), then select the  group of nodes where you want to don't apply the redundant BC.

Last edited by AlbiBone (2020-11-07 11:59:05)