INCREASING ERROR % PROBLEMS in RADIOSS

BULA
BULA Altair Community Member
edited March 2021 in Community Q&A

HELLO everyone!!!

we are working on an impact test on RADIOSS. The test involves an impact of a square block of concrete on a tractor cab (ROPS). The cabin was modeled with SHELL elements and the block with HEXA elements. The fall of the block follows a pendulum trajectory and the rope is modeled as a RBE3.The contact between cabin and block is TYPE 19.
The problem is that the energy error % increases until it reaches + 99.9% the remaining time also increases.
There are no initial penetrations.

we need your help.

 

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Answers

  • Rogerio Nakano_21179
    Rogerio Nakano_21179 New Altair Community Member
    edited March 2021

    Hi

     

    Hourglass and Contact energies are not used for the %Error calculation.

    image

     

    Please check what Isolid and Ishell formulation you are using. I suggest to use Isolid=24 and Ishell=24.

     

    Also if you intend to use the RBE3 as a cable idealization, RBE3  is not the correct option. Better use an rigid entity or spring element.

     

    I Hope this is helpful to you.

    Regards

  • BULA
    BULA Altair Community Member
    edited March 2021
    Rogerio Nakano_21179 said:

    Hi

     

    Hourglass and Contact energies are not used for the %Error calculation.

    image

     

    Please check what Isolid and Ishell formulation you are using. I suggest to use Isolid=24 and Ishell=24.

     

    Also if you intend to use the RBE3 as a cable idealization, RBE3  is not the correct option. Better use an rigid entity or spring element.

     

    I Hope this is helpful to you.

    Regards

    thank you for your help!!!

    we would like to use spring elements but we don't know how to do it, any advice?

  • BULA
    BULA Altair Community Member
    edited March 2021

    thank you for your help!!!

    we would like to use spring elements but we don't know how to do it, any advice?

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