Model a box fixed on a plate

CdricCd

Hello everyone,

 

I have a plate on which I want to model a kind of box (with known mass and inertia) fixed on it. So I put a CONM2 at the coordinates of the COG of the box, enter the mass and inertia.

Now I want to set it on the plate (no screws). Do I have to link all of the nodes of the surface to the CONM2, or just few of them (like the four ones in the corners) ? See pics below.

A second question : Is it preferable to use RBE3 or RBE2 in this case ?

 

Thanks for the answers !

 

 

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Altair Forum User

Hi,

 

The second case looks close to reality. 

 

Prefer RBE3 over RBE2 for load transfer.