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Ansys beam element torsional stress

Ansys beam element torsional stress

Ansys beam element torsional stress

(OP)
Hello everyone,

Is it possible to extract the shear stress due to torsion from the Ansys beam 188 element? I have created a simple case in which the cross section is an I-beam. One end is fixed while the other end is subjected to a moment leading to torsion. I can see that the I-beam deforms in the expected way, but the shear stresses are zero. The Beam tool does not have a shear stress output either.

Or is it not possible to use beam elements for torsion?

Regards,
AW2011

RE: Ansys beam element torsional stress

Hi,

Sorry to answer your question with a question, but here it goes: are you applying torsional loads large enough to partially yield the cross-section? If so, beam elements like 189 are not very well suited for that. The re-distribution of shear stresses are not captured during the analysis. If that's the case you're better of using shells or solids.

/petb

RE: Ansys beam element torsional stress

(OP)
Hi petb,

thanks for your reply.

I have just replaced the I-beam with a circular cross-section (because I wasn't sure what torsional loads would cause an I-beam to yield). I have applied a small moment at one end such that the beam should remain in the elastic regime. So I have hand calculations to show what the maximum (elastic) torsional stress should be ( around 100 MPa), and I am trying to see this on workbench. However, the shear stresses displayed are all very low (around 0.01MPa).

I read that beam 188/189 have torsional capabilities. But must I key in some APDL command to visualize this on workbench?

Regards,
AW2011

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