Torsion constant of Rectangular Tube

disladisla
Hi,

¿What does the “Torsion constant” on the dialog box of the Rectangular Tube refers too?
¿Why if thickness is ½ of the side it doesn’t match with the solid bar?
¿Is it possible that the formula that has been used is only valid for thin-walled Rectangular Tube?

Regards

Comments

  • disladisla
    edited October 2022
    I have confirmed that the formula is only valid for thin-walled Rectangular Tubes.

    16. Hollow rectangle, thin-walled
    Roark's Formulas.

    @Victor _ ¿Does this value participate in any computation or is it just informative?
  • VictorVictor
    Yes, only for thin-walled, and yes it's used by the internal solver for torsional stiffness, but not by CCX.
  • disladisla
    edited October 2022
    Thanks Victor,

    Circular pipe seems fine the whole range and the hallow Torsional Constant converge to the solid when diminishing internal radio.
    Seems Square is not so simple and people goes to tools based on the finite element method to compute this value.

    open-source engineering : https://github.com/robbievanleeuwen/section-properties
  • cwharpecwharpe
    edited October 2022
    .
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