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Determine Torsional stiffness/rigidity

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05-16-2013 10:44 AM

Hi

I would like to determine the torsional stiffness or a non-circular, constant cross-section part. I am trying to optimize the composition/cross section of a simple airfoil and need to examine the impact of changes to the cross section on the torsional stiffness. How can one determine torsional rigidity/stiffness?

Thanks,
Shannon

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Re: Determine Torsional stiffness/rigidity

05-17-2013 06:45 AM in reply to: sapayne

Could you apply a torque to twist it, and then measure or calculate the angle of twist?

John Holtz, PE
Mechanical Engineer
Pittsburgh, PA

Simulation Mechanical user since Dec 1997
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Re: Determine Torsional stiffness/rigidity

05-17-2013 08:05 AM in reply to: sapayne

This is precisely the work around I've applied. Thanks for the feedback :]

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Re: Determine Torsional stiffness/rigidity

05-17-2013 08:13 AM in reply to: AstroJohnPE

On a similar note, when applying this method to irregularly shaped torsion members, is there a simple means of precisely determining the neutral axis?

Thanks,
Shannon

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Re: Determine Torsional stiffness/rigidity

05-21-2013 02:17 PM in reply to: AstroJohnPE

Do you have a recomended means of applying pure torsion?
At the moment I have applied a torque to a selected surface, however It appears that this may be applying a torque to eash individual node and I am not certain that the part is experienceing pure torsion.