ABAQUS torsion question
ABAQUS torsion question
(OP)
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.
Kinematic Coupling:
http:// files.engi neering.co m/getfile. aspx?folde r=4d4dccc8 -a941-4320 -a486-fc07 6029d09e&a mp;file=Co upling.jpg
Boundary Condition and Load:
http:/ /files.eng ineering.c om/getfile .aspx?fold er=b7de2d2 9-bc7d-429 5-af41-7fd 2e0a0fb57& amp;file=B C_Load.png
Result:
http ://files.e ngineering .com/getfi le.aspx?fo lder=5b333 728-9a31-4 a58-9ec4-f e5ea415abd c&file =Bulge.jpg
Regards,
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.
Kinematic Coupling:
http://
Boundary Condition and Load:
http:/
Result:
http
Regards,





RE: ABAQUS torsion question
The manager
RE: ABAQUS torsion question
Thank you for the reply. The job is not necked. It is conical. The constrained face (with DOFs 0) is constrained throughout but the other face just grows in diameter, both ID and OD and the whole part kind of gradually grows in diameter along the whole length. I am putting in another picture, but i think this one is coming out small too....I donno why. I am attaching my small CAE file as well (ABAQUS ver 6.11).
http://f
CAE file: http://
Can you please look into and advise as to whats goin on?
Regards,
RE: ABAQUS torsion question
You should measure the displacement at one point of the outer diameter of the unconstrained face and check if the result is consistent.
Hope it helps.
RE: ABAQUS torsion question
The manager