FEA of a square torque tube

[BeaglePapa61]

Hello  together,

I am new here and also relatively new to FEA.

I have the following problem:

I want to fix a square tube (135x135x 2mm) of steel, 2.64m long, at one end firmly clamped, at the other end loaded with a torque and determine the angle of twist.

A. Do I get better results with the solid or the shell model?

B. For comparison, one employee uses ANSYS. When I solve the task with the volume model, the results are equal in NASTRAN (volume model) as in ANSYS (shell model). However, I know that thin-walled components should be calculated better with the shell model. I have done this in NASTRAN, but the results between the volume and shell model look very different...

C. How would you solve this task?

I'm looking forward to your answers and thank you in advance.

Regards, Michael

[benoit.neu-faber]

Hallo Michael,

Usually we advise to use shell element for thin parts.

But you should find more or less the same results as soon as you have decent mesh quality.

How big is the difference between the two models ?

Gruss aus Elsass 🙂

MFG

Benoit Neu-Faber

INNOSIM https://servicesmarketplace.autodesk.com/provider/public/innosim

Autodesk Service Provider / Nastran Trainer

https://www.linkedin.com/in/benoit-neu-faber/

Please accept solution and give likes if applicable

[BeaglePapa61]

Hallo Benoit,

vielen Dank, können wir auf Deutsch weitersprechen oder ist Englisch für das Forum besser?

[BeaglePapa61]

Siehe Bilder, ein viertes folgt.

[BeaglePapa61]

Hier das vierte Bild.

[benoit.neu-faber]

Hallo Michael,

There is something wrong with the solid model.

Can you send me the inventor model ?

Benoit 

[BeaglePapa61]

Hello Benoit, with pleasure 🙂

[benoit.neu-faber · Accepted solution]

Hallo Michael,

There some best practices on applying a moment on surfaces.

Please find attached a picture of the displacement on the solid mesh.

And also the inventor file.

I also sent you an email.

Best regards

Benoit Neu-Faber

INNOSIM https://servicesmarketplace.autodesk.com/provider/public/innosim

Autodesk Service Provider / Nastran Trainer

https://www.linkedin.com/in/benoit-neu-faber/

Please accept solution and give likes if applicable

[BeaglePapa61]

Good morning Benoit.

Thank you very much for your help 🙂

I got no email than the automatic email from the forum...

May I contact you with another problem?

Best regards

Michael

[BeaglePapa61]

Hello Benoit.

I would definitely be interested in another solution for a shell model.

Best regards

Michael

[benoit.neu-faber]

please check the address :

Benoit

[BeaglePapa61]

Pardon, where got you my old emal-address?
My actual email-address is

[benoit.neu-faber]

Hallo Michael,

If this one is solved, please accept the solution.

If you have another question, you can send it over the rhein 😀

Benoit