RBE3 Element ? HOw to use this with solid elements

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

HI all!!

I am trying to couple 3d solid tetra elements using rbe3 element and everytime it is showing error with dof saying dpendent dofs cant be constrained...but when i use this rbe3 element with shell elements it worls w\o showing any error kindly help me with how to use this rbe3 element .

and if possible what is the difference between rbe3 and rbe 2 element.

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2012

    how many degrees of freedom does your RBE3 element have? tets elements have 3 DOFs, no rotations only displacements. Your rbe3 element have 6 dof for each node.

    Are you using a SHELL skin with the Tet elements?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2012

    Also of interest might be this webinar recording:

    HW BestPractice Webinars (engl.): Using RBEs and MPCs in RADIOSS
    />http://www.altairhyperworks.de/ResLibSearchResult.aspx?keywords=Using RBEs

    Regards

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2012

    yes i know rbe3 has 6 dgrees of freedom and tets have 3 dof but i have constrained all 3 rotational dofs ,but still i am having problem

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2012

    thanks a lot for the replies ,now i found a solution for the previous error message ,but a new error is troubling me for which i was using rbe constraint ,the error msg shown is in static load case the compliance is large 2.95 e+10 optimization can not be performed ,kindly provide me a solution for the same.

    Thanks

    Himanshu

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2012

    Also of interest might be this webinar recording:

    HW BestPractice Webinars (engl.): Using RBEs and MPCs in RADIOSS

    http://www.altairhyperworks.de/ResLibSearchResult.aspx?keywords=Using%20RBEs

    Regards

    Thanls a million Hettel your link was really helpful.
  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2013

    Same types of problem running through in my reb3 i am very trouble for this problem for the last week ago..In this discussion i solved many problem but not complete.Hope you further discussion is solved my all problem in rbe3...

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2013

    Does your model free in any DOF?

    Large compliance comes if your model does not get any one constraint inclusing rotational.

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