Problem about CROD elements

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

Hi everyone! 

I tried to do a linear static analysis and I found out that the stresses on CROD elements didn't change varying Beam section Areas or Young modulus E, and I don't know why.

Attached the hyperview output image.

Please help meee!

<?xml version="1.0" encoding="UTF-8"?>Cattura1.PNG

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited July 2019

    This could be a modeling issue (massless mechanism) due to the connection of CROD and SOLID elements. CROD has axial and torsional stiffness, and solid has only 3 translational stiffness. As a workaround, create a layer of shell elements on top of the solids, so the nodes connecting to CROD have rotational stiffness. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2019

    Thank you for the answer but CROD elements are connected only to CBEAM elements (no solid elements) to model pistons pushing on the pins

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited July 2019

    Please share the fem file to take a quuick look.

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