Model a box fixed on a plate

CdricCd
CdricCd Altair Community Member
edited October 2020 in Community Q&A

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 !

 

 

<?xml version="1.0" encoding="UTF-8"?>case_1.PNG

<?xml version="1.0" encoding="UTF-8"?>case_2.PNG

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2017

    Hi,

     

    The second case looks close to reality. 

     

    Prefer RBE3 over RBE2 for load transfer. 

  • CdricCd
    CdricCd Altair Community Member
    edited November 2017

    Ok nice thanks for the quick answer !

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