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how to see torsion when a moment is applied

Creator
Creator

Hello there!

I'm having a problem analysing a torsion.

I have a hollow NACA 0012 wing profile with a small slot on the trailing edge. I fully constrained one side and applied a moment on the other. I'm looking for the rotation values on the Z axis (preferably with the referencial on the centroid). It's expected that the torsion grows from 0 on the constrained side and maximum on the other side.

 

I'm using 2D elements with 1 mm thickness.

 

What am I getting wrong?

 

Thanks in advance 

 
Captura de ecrã 2018-06-14, às 19.50.48.jpg

 

8 REPLIES 8

Re: how to see torsion when a moment is applied

Gears Phenom Gears Phenom
Gears Phenom

Post here NX model and .dat/.bdf file with Nastran input. One model is better than hundred of pictures.

Re: how to see torsion when a moment is applied

Gears Phenom Gears Phenom
Gears Phenom

Add also dat or bdf file with solver input for those who dont have NX.

Re: how to see torsion when a moment is applied

Creator
Creator

Sorry, as you can see I'm still learning

Re: how to see torsion when a moment is applied

Gears Phenom Gears Phenom
Gears Phenom

When you run model - Nastran create many files in model directory: *.f06 - error log, *.op2 - results, *.dat - solver input that contain mesh, loads, constraints and analysis setting. This dat file can be imported to NX or Femap or other FEA sofrware or edited by hand in text editor. This file is more practical to inmpot - it can be imported to previous versions of NX.

Re: how to see torsion when a moment is applied

Creator
Creator

but do you need any other file?

Re: how to see torsion when a moment is applied

Gears Phenom Gears Phenom
Gears Phenom

I have Femap, it can open *.dat file and can not open *.fem or *.sim files.

Re: how to see torsion when a moment is applied

Creator
Creator
I understand, and I've uploaded the .dat file already. thanks for you patience

Re: how to see torsion when a moment is applied

Gears Phenom Gears Phenom
Gears Phenom

Do not apply moments to nodes on contour of wing, use RBE2 or REE3 and apply total moment to center node of "spider".

Or calculate forces from total moment and apply it to nodes.

Also some surfaces are not conected - is it ok?

RBE2.jpgWing.gifNot conected surfaces.jpg