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Torsion in ABAQUS

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Posts: 135
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Joined: 16 years ago

Hello all,

I have a really simple question (most of you might know the solution from top of your head as well). I am trying to get started in ABAQUS and am in process of modeling torsion in a hollow cylinder. I constrain all DOFs on the one face and use a Reference point kinematic coupling on the other face. Then I give a BC at STEP 1 (after initial step) of rotation UR3 (in axial direction) = 1.5 (about 90 deg) to the reference point. This should theoritically proide torsion to the cylinder but what i see is that the cylinder kind of bulges. I am not sure why is this happening and how can I fix it. I am simply tyring to simulate the load (RM) required to twist it but really doing something wrong.

I am attaching some pitures showing coupling, boundary conditions and result alongwith. Can someone please tell me what is the issue with this simple problem.



ps: its been years since I touched ABAQUS, its still in the process of coming back to me...

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Posts: 3993
Joined: 4 years ago

The deformed shape you are showing may be correct if you are applying a large torsional rotation. How much rotation did you apply? How much did the radius shrink?


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