Analysing a rocker with 3D Tetra Mesh and adjecent parts

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

Hi guys,

 

I would like to simulate a rocker including adjecent parts

Therefore I meshed the body with 3D Tetra mesh and added the rods by using CROD Elements and place them on the RBE2 Node of the holes. Constaints in Translation (X,Y,Z) are at the end of the Rods and additionally at the lower left hole of the rocker. The force is placed on the upper left hole.

In the results I have great displacement (no matter how I change the e-modulus of the rods) and additionally I don't understand the reason why the displacement in Y differs along the thickness. Seems to bei something wrong in Rod connection?

 

Does anybody have an idea how to interpret the results and how to fix the model.

 

Thanks a lot.

Bye,

Jan

 

 

 

 

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited April 2015

    Hi Jan,

     

    Could you please use CBEAM element instead of CROD element.CROD - a simple, axial bar element that supports only axial forces and torsional moments

    Currently in your model rotation are free for CROD end. Please restrict rotational degree of freedom (4,5,6) and give a try.

     

    Regards

    Rahul R

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2015

    Hi Rahul,

     

    Thank you that helped a lot

    The hint with CBEAM elements worked. So I think I don't need to restrict the rotational degrees additionaly. That would be far away from realcase.

    But am I right so the rods take a lot bending although they're meant to support only the axial forces?

     

    Regards

    Jan

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