error in modelling using RBE3

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

I want to understand the meaning of this statement 'RBE3 with less than 3 legs should not exist '. 

 

I am defining seam welds with hexa adhesive type (RBE3-HEXA-RBE3). How to avoid the 3 legs in RBE3 type of connection?

 

Thanks in advance.  

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited April 2017

     'RBE3 with less than 3 legs should not exist '

    It means for single RBE3 element you should not have less than 3 slave nodes.In your case RBE3 which has two slave nodes is creating problem for run.

     

     

  • tinh
    tinh Altair Community Member
    edited April 2017

    Hi, 

    Looks like your mesh size is coarse or try increasing tolerance so rbe3 will cover more nodes

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2017
    Altair Forum User said:

    Hi, 

    Looks like your mesh size is coarse or try increasing tolerance so rbe3 will cover more nodes

    But how do I check those rbe3 with less than 3 legs? There are nearly 5000 rbe3 in my model. Do I need to check them individually?

  • tinh
    tinh Altair Community Member
    edited April 2017
    Altair Forum User said:

    But how do I check those rbe3 with less than 3 legs? There are nearly 5000 rbe3 in my model. Do I need to check them individually?

     

    Hi, 

    a few tcl commands can help you to filter them: 

     *createmark elems 1 'by config' rbe3 *createmark elems 2 'less than value' nodecount 4; # 2-leg rbe3 has 3 nodes *markintersection elems 1 elems 2 *entityset[expr [hm_entityinfo exist sets <3-legRBE3 -byname]?'update':'create'] <3-legRBE3 elems 1 *clearmark elems 1 *clearmark elems 2

    above will create a set of concerned rbe3 so you can review them

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