How do loads applied to RBEs translate to models?

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hi,

 

Say I have a rigid body element in a hole, with one independent node in the middle and the dependent nodes being the inside surface of the hole. Now if I apply a force to the independent node and it is pointing towards one side of the hole, how does the force translate to the hole? Will it apply compression on one side of the hole and tension on the other? Or will it just apply a compression on one side?

 

<?xml version="1.0" encoding="UTF-8"?>demo.png

 

Cheers,

 

Josh

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited November 2016

    While post processing you can visualize behaviour. It should apply compression on one side of the hole and tension on the other.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2016

    Thanks for that, Rahul! In that case, do you have any suggestions on how to simulate bolted joints and radial loads into a bearing housing?

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited November 2016

    For loading, don't use RBE2 but use RBE3 (interpolation element).

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2016

    Hi Nguyen,

     

    I've done a bit of research into RBE3s because I haven't used them before, but still don't quite understand them.

     

    Is there a way I can set up my RBE to transfer ONLY compression loads, NOT tension loads?

     

    This is how I'd go about simulating a bolt in shear loading.

     

    Cheers!

     

    Josh

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2016

    Hi, 

     

    Im looking at the same thing as you Josh! Still trying to find the way to do it

     

    Thanks

    Cara

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2016
    Altair Forum User said:

    Is there a way I can set up my RBE to transfer ONLY compression loads, NOT tension loads?

     

    I dont think it is possible with RBEs, as the RBE2s are stiffer and pushes/pulls the nodes equally.

     

    In order to have only compression load to transfer and no tensions, the nodes which you think will under go should be connected to elements which has almost no stiffness.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2016

    Hi Prakash,

     

    thanks for that! Is there some other specific way you'd recommend modelling bolts in shear loading?

     

    Maybe a solid model with high stiffness?

     

    I am specifically looking to model how an aluminium part will distort around steel bolt. The bolt is going to be the constraint and the load will be applied elsewhere on the part.

     

    Thanks!

     

    Josh

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2016

    As @Q.Nguyen-Dai suggested try with RBE3 with different weight factors

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2016

    Thanks Prakash,

     

    I'll have a deeper look into RBE3s then.

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