How to give torsional stiffness to a spring in FEA analysis?

[Anonymous]

Heey!

I am doing an fea analysis in Autodesk Inventor.
And I want to give a spring in my design a torsional stiffness of 750 Nm/rad, how can I do that?

I hope that someone can help me

[JDMather]

Attach file(s) here.

[Anonymous]

So, between the hinges there must be a spring with a torsional stiffness of 750 Nm/rad

[Anonymous]

Owh and here is the assembly 

[JDMather]

Carbon Fiber is not isotropic.

What is your purpose for doing this analysis - specifically, what do you want to know?

[Anonymous]

I want to determine the natural frequency of the beam.

There is a torsion spring between the hinge leafe and beam. 

I want to give the spring a torsional stiffness of 750 Nm/rad, but in Inventor I only can give the spring a normal or tangential stiffness

[Anonymous]

[lena.talkhina]

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[johnsonshiue]

Hi! I don't believe you can assign torsion stiffness or torsion constant in FEA. It is because the property depends on shape. It is a calculated property, not an assigned property like Young's modulus or density.

Many thanks!